JP6393552B2 - 合成樹脂部品の結合構造 - Google Patents

合成樹脂部品の結合構造 Download PDF

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JP6393552B2
JP6393552B2 JP2014167124A JP2014167124A JP6393552B2 JP 6393552 B2 JP6393552 B2 JP 6393552B2 JP 2014167124 A JP2014167124 A JP 2014167124A JP 2014167124 A JP2014167124 A JP 2014167124A JP 6393552 B2 JP6393552 B2 JP 6393552B2
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boss portion
boss
synthetic resin
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JP2016043500A (ja
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智也 佐久間
智也 佐久間
翔一 長谷川
翔一 長谷川
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Kasai Kogyo Co Ltd
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Kasai Kogyo Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B29C65/607—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking the integral rivets being hollow
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—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
    • 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
    • B29C66/543—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 more than two hollow-preforms to form said hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3014—Door linings
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3026—Arm-rests

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

本発明は、複数の合成樹脂部品の相互を重合して、該重合部分をボス溶着工法により熱かしめして結合する合成樹脂部品の結合構造に関する。
図５、図６は従来の合成樹脂部品の結合構造の一例を示すもので、本例では熱可塑性樹脂材からなる３枚の平板状の合成樹脂部品を部分的に重合して、該重合部分をボス溶着工法により熱かしめして結合する場合を示している。
下側部材１、中間部材２、および上側部材３はそれらの連結部分を相互に重合してあって、下側部材１にはボス部４を突設してある一方、中間部材２および上側部材３にはボス挿通孔５、６を形成して、これらボス挿通孔５、６にボス部４を挿通してある。
そして、ボス部４の突出端部を例えば超音波溶着機を用いて、そのホーンにより所要の押圧力と超音波振動を付加して発生する摩擦熱で溶融し、ホーンの成形凹部の内面形状に見合った熱かしめ部Ｗを形成して、これら３部材１、２、３を熱かしめにより結合するようにしている。
このような結合構造は、例えば自動車のドアトリムにおけるロアトリムとセンタートリムとドアアームレストとの重ね合わせ結合部分などに用いられている。この類似構造は、例えば特許文献１および特許文献２に示されている。
実開平４−１１３１２２号公報 特開２０００−６７３３７号公報
前記従来の結合構造では、３部材１、２、３の組付け性を考慮して中間部材２と上側部材３のボス挿通孔５、６を、部材相互の成形誤差を十分に吸収し得るようにボス部４よりも大径に形成する必要がある。
一方、ボス部４の熱かしめ処理でボス部４と上側部材３とは溶着されるが、中間部材２はボス部４とは非溶着関係にあるため走行時振動等で中間部材２に図６Ａ、図６Ｂに示すようにずれを生じ易く、これが低吸音の発生原因となってしまう不具合を生じる。
そこで、本発明は下側部材と上側部材との間に介在する中間部材にずれを生じることなく、それらの重合部分をボス溶着工法により熱かしめして結合することができる合成樹脂部品の結合構造を提供するものである。
本発明に係る合成樹脂部品の結合構造は、下側部材に突設したボス部を、該下側部材に重合配置した中間部材と上側部材とに挿通し、該ボス部の突出端部を熱かしめして結合する構造であって、前記中間部材に、前記下側部材のボス部と共に前記上側部材のボス挿通孔に挿通されて同心的に突出する環状のボス部を設け、前記中間部材の環状のボス部と、前記下側部材のボス部とが一体に溶融されていて、前記上側部材のボス挿通孔の周縁部上に熱かしめされていることを特徴としている。
上述の中間部材の環状のボス部の突出する長さを前記下側部材のボス部の突出する長さよりも低く設定し、該下側部材のボス部が熱かしめ治具の成形凹部に先当たりするようにしたことを特徴としている。
また、この熱かしめを超音波溶着機を用いてそのホーンで所要の形状、大きさの熱かしめ部を形成することができる。
本発明によれば、下側部材のボス部と中間部材の環状のボス部とが上側部材を挿通して同心的に突出してそれらを一体に熱かしめして結合してあるため、これら下側部材と中間部材および上側部材とを相互に溶着関係の結合構造とすることができる。
この結果、中間部材が正規位置からずれてパーティングラインが不整合となって外観を損なったり、外部振動でずれ動いて不快な低級音を生じたりするのを回避できることができる。
上述の中間部材の環状のボス部の突出量を下側部材のボス部の突出量よりも低く設定して、該下側部材のボス部を熱かしめ治具の成形凹部に先当たりさせれば、ボス部の熱溶着が中心側から多段に行われてボス溶着による熱かしめをスムーズに行わせることができる。
また、熱かしめを超音波溶着機を用いて行う場合に、ホーンによる溶着加工中に超音波振動で中間部材がずれ動いて結合不良を生じるのを回避することもできる。
本発明の第１実施形態における複数の合成樹脂部品の配置関係を示す分解斜視図。 第１実施形態のボス溶着による熱かしめ前の状態を示す断面図。 第１実施形態のボス溶着による熱かしめ後の状態を示す断面図。 本発明の第２実施形態を示す図２と同様の断面図。 従来の構造の一例を示す図１と同様の分解斜視図。 従来の構造のボス溶着による熱かしめ後における中間部材の正常状態とずれ状態とを（Ａ）、（Ｂ）にて示す断面図。
以下、本発明の実施形態を図面と共に前記従来の構造と同一部分に同一符号を付して詳述する。
図１に示す第１実施形態は熱可塑性樹脂材からなる３枚の平板状の合成樹脂部品を部分的に重合して、該重合部分をボス溶着工法により熱かしめして結合する場合を示している。
下側部材１、中間部材２、および上側部材３は図２に示すようにそれらの連結部分を相互に重合してあって、下側部材１にはボス部４を突設してある一方、中間部材２および上側部材３にはボス挿通孔５、６を形成して、これらボス挿通孔５、６にボス部４を挿通してある。
ボス部４は端部側から溶融し易いように円筒状に形成することによって、下側部材１の表面側（図１、図２の下側）のヒケ防止と樹脂材料の軽減化を図ると共に、突出端部に対する後述するホーン１０のセッティングを行い易いようにしている。
中間部材２のボス挿通孔５は、下側部材１のボス部４を遊挿可能なように該ボス部４よりも大径に形成して良好な組付け性が得られるようにしてあり、その上側の孔縁部にはボス部４と共に上側部材３を挿通して上側に向けて同心的に突出する環状のボス部７を突設してある。
従って、上側部材３のボス挿通孔６は、この環状のボス部７を遊挿可能なように該環状のボス部７よりも大径に形成して良好な組付け性が得られるようにしている。
そして、この中間部材２の環状のボス部７を図３に熱かしめ部Ｗとして示すように下側部材１のボス部４と一体に上側部材３のボス挿通孔６の周縁部上に熱かしめして、下側部材１と中間部材２と上側部材３とを結合している。
ボス部４および環状のボス部７の上側部材３からの突出量は、十分な結合強度を確保できる大きさの熱かしめ部Ｗが得られるように任意に設定される。
本実施形態では図２に示すように中間部材２の環状のボス部７の突出量を下側部材１のボス部４の突出量よりも低く設定して、該下側部材１のボス部４が熱かしめ治具１０の成形凹部１１に先当たりするようにしている。
上述の熱かしめ部Ｗを成形するボス溶着工法として公知の超音波溶着機を用いることができる。
図２に例示した熱かしめ治具１０はこの超音波溶着機のホーンを示しており、ホーン１０の成形凹部１１は所要の容積の略半球状凹部として形成してあって、その凹部中心にはボス部４の端部の加振，溶融を促進するための突起１２を突設してある。
このホーン１０の成形凹部１１を図２に示すように下側部材１のボス部４の突出端部にセットする場合に、突起１２がボス部４の筒状の端部内に進入することにより自動調芯されてセッティングを容易に行うことができる。
そこで、このホーン１０によりボス部４の突出端部に所要の押圧力と超音波振動を付加すると、その接触部に発生する摩擦熱でボス部４の突出端部が溶融する。
そして、このボス部４の突出端部の溶融に続いてホーン１０の成形凹部１１が中間部材２の環状のボス部７の外周縁側から接触して、該環状のボス部７も一体となって溶融することによって、ホーン１０の成形凹部１１の内面形状に見合った熱かしめ部Ｗが形成される。
これにより、これら下側部材１と中間部材２および上側部材３の３部材を熱かしめによりしっかりと結合することができる。
以上のように本実施形態の構造によれば、下側部材１のボス部４と中間部材２の環状のボス部７とが上側部材３を挿通して同心的に突出してそれらを一体に熱かしめして結合してあるため、これら下側部材１と中間部材２および上側部材３とを相互に溶着関係の結合構造とすることができる。
この結果、中間部材２が正規位置からずれてパーティングラインが不整合となって外観を損なったり、外部振動でずれ動いて不快な低級音を生じたりするのを回避することができる。
また、中間部材２の環状のボス部７の突出量を下側部材１のボス部４の突出量よりも低く設定して、該下側部材１のボス部４を熱かしめ治具１０の成形凹部１１に先当たりさせるようにしているので、熱溶着が中心側のボス部４から外周側の環状のボス部７に多段に行われてボス溶着をスムーズに行わせることができる。
そして、上述のように下側部材１のボス部４と中間部材２の環状のボス部７とを一体に溶融して上側部材３のボス挿通孔６の周縁部上に熱かしめするので、この熱かしめを超音波溶着機を用いて行う場合に、ホーン１０による溶着加工中に超音波振動で中間部材２がずれ動いて結合不良を生じるのを回避することもできる。
図４は、下側部材１と上側部材３との間に複数の中間部材、例えば２つの中間部材２、２Ａを介装した本発明の第２実施形態を示している。
中間部材２Ａのボス挿通孔５Ａは、中間部材２の環状のボス部７を遊挿可能なように該ボス部７よりも大径に形成して良好な組付け性が得られるようにしてあり、その上側の孔縁部にはボス部４および環状のボス部７と共に上側部材３を挿通して上側に向けて同心的に突出する環状のボス部７Ａを突設してある。
環状のボス部７，７Ａはボス部４の外周側に２枚重ねとなるため、上側部材３のボス挿通孔６および熱かしめ部Ｗ（図３参照）が徒に大きくならないようにそれぞれ肉厚，外径が任意に設定される。
そして、下側部材１のボス部４とこれら中間部材２，２Ａの環状のボス部７，７Ａとを、上側部材３を挿通して上方に同心的に突出させてそれらを一体に熱かしめして結合してある。
従って、本実施形態にあっても下側部材１と中間部材２，２Ａおよび上側部材３とを相互に溶着関係の結合構造とすることができ、前記第１実施形態と同様の効果を得ることができる。
前述の各実施形態の結合構造は、例えば自動車のドアトリムやリアサイドトリム等の車両用内装材における複数の合成樹脂部品の重ね合わせ結合部分に適用して有効であるが、これに限らず各種の合成樹脂部品の結合構造に適用することができる。
また、上側部材３は熱かしめ部Ｗにより抜け止め固定されるので、熱可塑性樹脂材に限定されることはなく、他の合成樹脂製あるいは金属製等の部品の場合にも適用することが可能である。
更に、前記実施形態では熱かしめを超音波溶着機のホーンで行う場合を例示したが、この他、熱源を備えた熱かしめ治具を用いることも可能である。
１…下側部材
２、２Ａ…中間部材
３…上側部材
４…ボス部
５、５Ａ…中間部材のボス挿通孔
６…上側部材のボス挿通孔
７、７Ａ…環状のボス部
１０…ホーン（熱かしめ治具）
１１…成形凹部
１２…凹部中心の突起
Ｗ…熱かしめ部

Claims (3)

  1. 下側部材に突設したボス部を、該下側部材に重合配置した中間部材と上側部材とに挿通し、該ボス部の突出端部を熱かしめして結合する構造であって、
    前記中間部材に、前記下側部材のボス部と共に前記上側部材のボス挿通孔に挿通されて同心的に突出する環状のボス部を設け、
    前記中間部材の環状のボス部と、前記下側部材のボス部とが一体に溶融されていて、前記上側部材のボス挿通孔の周縁部上に熱かしめされている
    ことを特徴とする合成樹脂部品の結合構造。
  2. 前記中間部材の環状のボス部の突出する長さを前記下側部材のボス部の突出する長さよりも低く設定し、該下側部材のボス部が熱かしめ治具の成形凹部に先当たりするようにしたことを特徴とする請求項１に記載の合成樹脂部品の結合構造。
  3. 前記熱かしめ治具が、超音波溶着機のホーンであることを特徴とする請求項２に記載の合成樹脂製品の結合構造。
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