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JP4531074B2 - 樹脂溶着体 - Google Patents

樹脂溶着体 Download PDF

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Publication number
JP4531074B2
JP4531074B2 JP2007111985A JP2007111985A JP4531074B2 JP 4531074 B2 JP4531074 B2 JP 4531074B2 JP 2007111985 A JP2007111985 A JP 2007111985A JP 2007111985 A JP2007111985 A JP 2007111985A JP 4531074 B2 JP4531074 B2 JP 4531074B2
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JP
Japan
Prior art keywords
resin
joint
welding
lid
welded body
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Application number
JP2007111985A
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English (en)
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JP2008265163A (ja
Inventor
晴三 藤本
京史 原
晋助 浅田
浩 小林
公昭 樽谷
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2007111985A priority Critical patent/JP4531074B2/ja
Priority to US11/892,039 priority patent/US8597755B2/en
Priority to KR1020070084816A priority patent/KR100870811B1/ko
Priority to DE102007046376.8A priority patent/DE102007046376B4/de
Publication of JP2008265163A publication Critical patent/JP2008265163A/ja
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Publication of JP4531074B2 publication Critical patent/JP4531074B2/ja
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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
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
    • B29C65/7823—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint
    • B29C65/7829—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint said distance pieces being integral with 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
    • 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
    • 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
    • B29C66/114—Single butt 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular 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
    • B29C66/50—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
    • B29C66/55—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 sealing elements being incorporated into the joints, e.g. gaskets
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • 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
    • 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
    • B29C66/7394—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 thermoset
    • 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
    • B29C66/80—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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/17—Three or more coplanar interfitted sections with securing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/8305—Miscellaneous [e.g., treated surfaces, etc.]

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

Description

本発明は、レーザ光に対して透過性を有する樹脂部品と、レーザ光に対して吸収性を有する樹脂部品を、レーザ光を用いて接合した樹脂溶着体に関する。
所定の波長のレーザ光に対して透過性を有する樹脂部品と、同波長のレーザ光に対して吸収性を有する樹脂部品を重ね合わせて、透過性の樹脂部品側からレーザ光ビームを照射することで両者を溶着するレーザ光溶着工法はよく知られている。
本工法の原理を簡単に説明する。
レーザ光ビームは透過性の樹脂中をほとんど吸収されずに通過し、吸収性の樹脂部品の表面付近で吸収される。吸収されたレーザ光のエネルギーは熱に変換され、吸収性の樹脂部品の表面を加熱する。吸収性の樹脂部品の表面と接した透過性部品の樹脂の表面近傍も、熱伝達により加熱される。その結果、透過性の樹脂部品と吸収性の樹脂部品の接触面において溶融層が形成され、溶着に至る。
前記の原理から明らかなように、溶着過程においては、透過性の樹脂部品と吸収性の樹脂部品との密着性が重要となる。両者の密着性が不十分な場合は、吸収性の樹脂部品から透過性の樹脂部品への熱伝達が不十分となり、接合不良に至るからである。一般的に、両樹脂部品の表面密着性を確保するために、透過性の樹脂部品と、吸収性の樹脂部品とを接合面において外部加圧により圧接した状態でレーザ光ビームの照射を行う。（例えば、特許文献１参照）。
特開２００４−３５８６９７号公報
上述の如く、溶着時には接合部に形成された溶融層に圧接の力が印加されるため、溶融部においてはレーザ光の照射を止めるか、加圧を止めるかしない限り溶融が進む。つまりは、二部品の近接が進むこととなる。二部品の間隔を所定値に維持しようとすると、二部品の間隔を精度良く検出する装置と、瞬時にレーザ光照射あるいは加圧を止める装置が必要になる。更に部品には寸法バラツキがあるため、各々の部品に対して個々に寸法を調整する必要が発生する。これらを実現しようとすると、非常に高価な設備が必要になってしまう。
また、レーザ光溶着工法は樹脂を溶かして溶融するため熱可塑性の樹脂を使用することが一般である。この熱可塑性樹脂は一般の成形方法として溶融する事自体はなんら問題が無く、所定の圧力で金型に流し込む事で所定の形状を作り上げる。この際、所定の圧力が実現されなければ樹脂密度が落ちるため、物理強度、加水分解性など樹脂性能が低下する。レーザ光溶着は、成形の様な金型がなく溶融樹脂の形状は自由であり成形圧力がかからないため、どうしてもこの点で通常の成形物に対し強度面で弱くなりやすい。そのため、二部品間で極めて高いシール性が必要とされるものについては、接合工程の高精度な制御や溶融面に極めて高精度な寸法管理が必要となり、高価な接合方法になっていた。
本発明は、前記のような点に鑑み、接合工程の高精度な制御や溶融面に極めて高精度な寸法管理を必要としなくとも、接合部の沈み込み量が高精度に管理された樹脂溶着体を提供することを目的とするものである。
本発明は、レーザ光に対して吸収性のある第１の樹脂部品と、レーザ光に対して透過性のある第２の樹脂部品とを嵌合すると共に、前記第２の樹脂部品側よりレーザ光を所定の位置に照射し、前記第１及び第２の樹脂部品を溶着して両樹脂部品の間に接合部を形成した樹脂溶着体において、前記接合部は周状に形成されると共に、前記接合部の内側に配置され前記第１の樹脂部品と前記第２の樹脂部品との溶着により押圧されるシール部材と、前記第１または第２の樹脂部品のいずれかに、前記溶着時において前記接合部における前記第１または第２の樹脂部品のいずれか一方に対する他方の沈み込み量を規制すると共に、前記押圧による前記シール部材の潰し代を規制するストッパとを備え、前記ストッパを前記接合部と前記シール部材との間に配置したものである。
本発明の樹脂溶着体によれば、樹脂溶着体自体で接合部における沈み込み量を容易かつ正確に規制することができるので、強度面で優れた高品質の樹脂溶着体を得ることができる。
実施の形態１．
図１及び図２は、本発明の実施の形態１である樹脂溶着体を示す外観全体図及び部分断面図である。ここでは樹脂溶着体として有底円筒状のケースと蓋体で構成される圧力センサなどの密閉容器を例にして説明する。
密閉容器１の蓋体２はレーザ光に対して透過性を有する樹脂からなる部品であり、ケース３はレーザ光に対して吸収性を有する樹脂からなる部品である。
ケース３には、その外形に沿ってリブ６が環状に設けられ、リブ６の内側には蓋体２に環状に設けられた位置決め用のガイド７が嵌合され、リブ６と蓋体２の接触面にレーザ光５による溶着によって形成された接合部４を有している。
また、ケース３には、リブ６の内側にリブ６と並行して環状の突起８が設けられている。この突起はケース３の開口方向に対して垂直に延在し、リブ６の高さ寸法より僅かに低い寸法に設定されており、後述するリブ６の蓋体２への溶着時に蓋体２がケース３側に沈み込み過ぎるのを制限するためのストッパ機能を果す。
前記のような密閉容器１において、接合部４は次のように形成される。即ち、蓋体２をガイド７を利用してケース３のリブ６に嵌合させ、蓋体２の裏面がリブ６の端面に当接する位置まで押し込んだ状態で、蓋体２側からレーザ光５を図示のイメージで照射する。照射されたレーザ光５は、透過性を有する蓋体２を通過して吸収性を有するケース３に設けられたリブ６の先端で吸収されて熱に変換され接合部４を一旦溶融させる。接合部４はレーザ光５の照射が止まれば再度凝固し、この箇所の溶着が実現される。
この溶着工程において、接合部４の溶融時、蓋体２はケース３側に沈み込むが、ケース３に設けられた突起８に当接しケース３側に沈み込み過ぎるのを制限される。
従って、この突起８の寸法を適正に設定することにより、レーザ光溶着による接合部４の沈み込み量を容易かつ正確に規制することができる。
以上のようにこの実施の形態１においては、レーザ光に対して吸収性のある第１の樹脂部品と、レーザ光に対して透過性のある第２の樹脂部品とを嵌合すると共に、第２の樹脂部品側よりレーザ光を所定の位置に照射し、第１及び第２の樹脂部品を溶着して両樹脂部品の間に接合部を形成した樹脂溶着体において、第１の樹脂部品に、溶着時に第２の樹脂部品と当接して接合部における沈み込み量を規制する突起（ストッパ）を設けることにより、溶着工程において高精度な制御や溶融面に極めて高精度な寸法管理を必要とせず、高品質の密閉容器を得ることができる。
なお、前記の説明において、リブ６、ガイド７、突起８はいずれも環状としたが、これに制限されるものではなく、部分的に配設されていても良い。
実施の形態２．
図３は、本発明の実施の形態２である樹脂溶着体を示す部分断面図である。この実施の形態２では、蓋体２側に突起８を設け、実施の形態１の突起８と同様のストッパ機能を持たせると共に、蓋体２の嵌合用のガイド７も兼用させたものである。
この突起８は、リブ６の高さ寸法より僅かに小さい寸法に設定されており、蓋体２がケース３に嵌合した状態でリブ６とは逆の垂直方向に延在し、リブ６の蓋体２への溶着時に蓋体２がケース３側に沈み込み過ぎるのを規制する。
以上のようにこの実施の形態２においては、レーザ光に対して吸収性のある第１の樹脂部品と、レーザ光に対して透過性のある第２の樹脂部品とを嵌合すると共に、第２の樹脂部品側よりレーザ光を所定の位置に照射し、第１及び第２の樹脂部品を溶着して両樹脂部品の間に接合部を形成した樹脂溶着体において、第２の樹脂部品に、溶着時に第１の樹脂部品と当接して接合部における沈み込み量を規制する突起（ストッパ）を設けることにより、溶着工程における高精度な制御や溶融面に極めて高精度な寸法管理を必要とせず、高品質の密閉容器を得ることができる。
実施の形態３．
図４は、本発明の実施の形態３である樹脂溶着体を示す部分断面図である。この実施の形態３は実施の形態１において更に高い密閉性を要求される場合における実施例であり、突起８の内側に沿って断面円形のシール部材９を環状に配置し、接合部４の溶着時に蓋体２を介してシール部材９を押圧するようにしたものである。
この場合、図５に示すように、蓋体２の加圧位置が突起８の上（図示一点鎖線上）ないしは内側にあることが重要であり、これにより、接合部４における蓋体２の沈み込みが不十分でも蓋体２に反りが発生するので、突起８が蓋体２に突き当たることになり、接合部４の状態に影響されずにシール部材９に対し所定の潰し代を付与できる。
仮に、加圧位置が突起８に対し外側にあれば、接合部４における蓋体２の沈み込みが完全でも、蓋体２の反りにより突起８が蓋体２に当らない場合が発生する。この場合は、突起８を確実に蓋体２に当てようとすると余分に接合部４における蓋体２の沈み込みが必要になってしまい、所定の条件では溶着できない場合も発生する。
なお、図６に示すように、蓋体２に段部１０がある場合でも、この段部１０を加圧すれば同様の効果が得られる。
以上のようにこの実施の形態３によれば、突起８の内側に蓋体２によって押圧されるシール部材９が配置されているので、接合部４において部品の寸法バラツキあるいは溶融状態のバラツキによる撓みなどが発生しても、シール部材９は突起８の寸法のみで潰し代が決められるため、接合面状況に関わらず安定したシール性が維持される。
また、図示のようにシール部材９を突起８の側面に当てれば、シール部材９の位置を固定するとともに突起８をシール部材挿入時のガイドとして使用することができる。これはシール部材９がＯリングのような環状の部品のときには特に効果があり、製品を組み立てる上で容易になる。
実施の形態４．
図７は、本発明の実施の形態４を示す樹脂溶着体の一例であり、実施の形態３と同様の密閉容器１を構成するもので、蓋体１がケース２に嵌合しているがレーザ光溶着前の加圧していない状態の部分断面図である。
図中のＬ１は蓋体１のガイド７とケース３のリブ６との嵌合代に相当する重なり寸法、Ｌ２はリブ６の高さ寸法、Ｌ３はリブ６の端面と蓋体２の底面との間の離間寸法、Ｌ４は突起８の端面と蓋体２の底面との間の離間寸法であり、Ｌ１，Ｌ２，Ｌ３，Ｌ４の各寸法がＬ１＞０，Ｌ２＞Ｌ４＞Ｌ３の関係になるように設定されている。
この寸法関係により、溶着までの各部品の嵌合の脱落がなく、容易な組み立て性と安定したシール性を維持することできる。
特に、Ｌ４−Ｌ３＞０．１ｍｍ、即ち接合部４の溶着時における沈み込み量を０．１ｍｍ以上になるように設定した場合には、図８に示すように3000サイクルのサーマルショックに対しても接合部の破壊がなく、十分なサーマルショック耐性が得られる。
本発明の実施の形態１に係わる樹脂溶着体の外観全体図である。 本発明の実施の形態１に係わる樹脂溶着体の部分断面図である。 本発明の実施の形態２に係わる樹脂溶着体の部分断面図である。 本発明の実施の形態３に係わる樹脂溶着体の部分断面図である。 本発明の実施の形態３における樹脂溶着体の溶着時の加圧状況を示す部分断面図である。 本発明の実施の形態３における他の樹脂溶着体の溶着時における加圧状況を示す部分断面図である。 本発明の実施の形態４における溶着前の樹脂溶着体の部分断面図である。 本発明の実施の形態４における樹脂溶着体のサーマルショック耐性を示す特性図である。
１ 密閉容器
２ 蓋体
３ ケース
４ 接合部
５ レーザ光
６ リブ
７ ガイド
８ 突起
９ シール部材
１０ 段部

Claims (4)

  1. レーザ光に対して吸収性のある第１の樹脂部品と、レーザ光に対して透過性のある第２の樹脂部品とを嵌合すると共に、前記第２の樹脂部品側よりレーザ光を所定の位置に照射し、前記第１及び第２の樹脂部品を溶着して両樹脂部品の間に接合部を形成した樹脂溶着体において、
    前記接合部は周状に形成されると共に、
    前記接合部の内側に配置され前記第１の樹脂部品と前記第２の樹脂部品との溶着により押圧されるシール部材と、
    前記第１または第２の樹脂部品のいずれかに、前記溶着時において前記接合部における前記第１または第２の樹脂部品のいずれか一方に対する他方の沈み込み量を規制すると共に、前記押圧による前記シール部材の潰し代を規制するストッパとを備え、
    前記ストッパを前記接合部と前記シール部材との間に配置したことを特徴とする樹脂溶着体。
  2. 前記シール部材はＯリングであることを特徴とする請求項１記載の樹脂溶着体。
  3. 前記シール部材は前記ストッパをガイドとして挿入されていることを特徴とする請求項２記載の樹脂溶着体。
  4. 前記ストッパは、前記溶着時において、前記第１または第２の樹脂部品のいずれか一方が他方に当接することで前記沈み込み量を規制する突起であることを特徴とする請求項１または３のいずれか一つに記載の樹脂溶着体。
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