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JP3733348B2 - Thermo welding equipment for thermoplastic resin molded products - Google Patents
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JP3733348B2 - Thermo welding equipment for thermoplastic resin molded products - Google Patents

Thermo welding equipment for thermoplastic resin molded products Download PDF

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Publication number
JP3733348B2
JP3733348B2 JP2002257818A JP2002257818A JP3733348B2 JP 3733348 B2 JP3733348 B2 JP 3733348B2 JP 2002257818 A JP2002257818 A JP 2002257818A JP 2002257818 A JP2002257818 A JP 2002257818A JP 3733348 B2 JP3733348 B2 JP 3733348B2
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Japan
Prior art keywords
welding
temperature
thermocouple
heat
tip
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Expired - Lifetime
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JP2002257818A
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Japanese (ja)
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JP2004090558A (en
Inventor
文昭 菊地
正洋 佐藤
恒男 守山
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ムネカタ株式会社
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Priority to JP2002257818A priority Critical patent/JP3733348B2/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
    • 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
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • 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
    • 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
    • B29C66/349—Cooling the welding zone on the welding spot
    • B29C66/3494—Cooling the welding zone on the welding spot while keeping the welding zone under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—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
    • 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
    • B29C66/80—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
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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、熱可塑性樹脂成形品に形成された溶着ボスを被固定物側に形成した固定孔へ挿入貫通し、この固定孔から突き出た溶着ボスにおける変形部の先端を溶着チップにより加熱加圧して変形させることにより、固定孔より直径が大きい膨大部を形成して被固定物を成形品に固定する際に用いられる熱可塑性樹脂成形品の熱溶着装置に関するものである。
【０００２】
【従来の技術】
熱可塑性樹脂からなる成形品同士を熱溶着する方法として、電気的な発熱体の加熱による熱かしめ溶着法が公知である。
この熱かしめ溶着法で重要なことは、適切な加熱温度を選ぶことで、例えば、加熱温度が高く成形品の樹脂材料における熱分解温度以上の熱を加えるとかしめ部分がもろくなり、溶着強度が低下する危険がある。また、逆に加熱温度が低いと十分に溶融されないため、かしめ部分の変形が所望する形状とはならず、十分な溶着強度が得られない場合がある。したがって、溶着チップの溶着面の温度を最適に管理することは、熱かしめ溶着において重要なことである。
【０００３】
従来の発熱体の加熱による熱かしめ方法を詳細に説明すると、先ず、成形品に一体成形された溶着ボスを被固定物側に形成された固定孔へ通す。次に、この固定孔から突き出た溶着ボスにおける変形部の先端側を発熱体により加熱溶融して固定孔より大きい膨大部を形成する。この膨大部により被固定物を成形品に熱かしめ固定（溶着）することができる。
例えば、ヒータに組み込まれた熱棒の先端面に、溶着ボスを溶融して変形させる半円形の凹部を形成する。
【０００４】
かしめる時は、熱棒を溶着ボスへ押し当て、加熱することにより溶着ボスが熱棒との接触面から徐々に溶融し、さらに、溶融した樹脂が半円形である凹部空間の内部を満たしていく。その結果、溶着ボスの変形部は拡大され固定孔の直径より大きな膨大部へと変形する。その後、熱棒を冷却させるか、又は、熱棒を離脱させた後、冷却用エアー等を吹きかけることにより、膨大部は固化し、その結果、被固定物は成形品へ熱かしめ固定されることになる。
【０００５】
以上の熱かしめ方法において、かしめ強度に影響をあたえるのは、熱棒の温度である。つまり、温度が低いと十分に溶融されないため変形が完全に行われなかったり、温度が高すぎると熱分解温度に達してかしめ強度へ悪影響をあたえることがあったりする。そのため、従来は、事前に電圧印加の時間や、電圧印加のＯＮ−ＯＦＦサイクル、印加する電圧の電圧値、などの諸要因を試験して熱棒が熱かしめに対して最適な温度になる様にかしめ固定条件を決めている。
【０００６】
しかし、かしめ（溶着）強度の品質を保証するには、かしめ固定作業を行う場合、熱棒が溶着ボスに当接したときの当接面の温度を測定して監視することが重要である。この例として、例えば、熱棒の温度を熱電対で測定する発明として特開２００１−１５０５５４号公報で提供されている。
その内容は、熱電対をヒータに固着し、さらに、熱電対を押さえ部材により熱電対との接続近傍または離れた位置など複数の箇所でヒータ外周に固定することにより、ヒータの熱（温度）を熱電対で検出し、フィードバック方式でヒータの温度を制御する方法である。
【０００７】
【発明が解決しようとする課題】
上記の公知の発明によれば、ヒータに熱電対を固着しているため、ヒータの温度を測定することができ、その測定値を制御回路へ導けばヒータの温度を制御することができる。
しかし、熱電対はヒータの外周部に固着し、さらに、熱電対が押さえ部材によりヒータ外部に固定されるため、次のような問題が生じる。
１．熱電対は、ヒータの外周に固着されているため、溶着ボスと当接する当接面の温度を測定しているのではない。一般的に側面は強度を得るためと、発熱する部分を当接面のみにするため（抵抗値の差）、とにより肉厚を厚くしている。そのため、当接面との温度差が大きくなり、溶着ボスへ与えている実際の加熱温度とは異なる。
２．熱電対を溶着装置の外部に沿わせているため、熱電対は露出していることから、汚れが付いたり、リード線が切れたりしやすいと共に、かしめ箇所の周囲に他の部品等が接近していると、熱電対が部品に引っかかったり、押し倒したりしてかしめ作業への支障が生じ、さらに、部品を破損したりするおそれがある。
３． ヒータで溶着したあと、この溶着部分を強制的に冷却する場合、溶着部分の冷却温度は測定できないが、できても精度が悪い。
【０００８】
本発明は、上記欠点に鑑みて提供されるものであって、溶着ボス（溶着チップ）と当接する発熱体の当接面の温度を正確に測定することにより、溶着温度を溶着条件に合わせて適切に管理して高品質のかしめを行うことができるようにすると共に熱電対が汚れたり、リード線が切れたり、作業時に部品に引っ掛かったりしない構造を有し、更に、冷却条件を合理的に設定して使用し、溶着作業の能率化を図ることができる熱溶着装置を提供することである。
【０００９】
【課題を解決するための手段】
上記目的を達成するため、請求項１に記載の発明においては、熱可塑性樹脂成形品の熱溶着装置において、熱可塑性樹脂成形品に一体成形された溶着ボスの先端側を溶着チップの熱で軟化又は溶融することにより変形して被固定物を前記熱可塑性樹脂成形品にかしめ固定する熱溶着装置において、前記溶着チップの当接面の裏側に、この当接面の温度を測定するために熱電対を取り付けると共にこの熱電対から出力される温度信号を溶着チップの温度制御部に受け入れて溶着チップにおける当接面の温度制御を可能にしたことを特徴とするものである。
【００１０】
更に、請求項２記載の発明においては、請求項１に記載の発明において、前記溶着チップを具備する発熱体ユニットが熱溶着装置から容易に脱着自在な構造であることを特徴とするものである。
【００１１】
更に、請求項３記載の発明においては、請求項１及び請求項２に記載の発明において、前記熱電対による溶着チップの温度測定に基づき電源装置に内蔵した温度制御部のトライアックを制御して、溶着チップに印加する電圧を制御することを特徴とするものである。
【００１２】
【作用】
請求項１記載の熱可塑性樹脂成形品の熱溶着装置においては、溶着チップを中空状の金属からなるカップ形状とし、さらに、溶着チップの内部では、溶着ボスに当接して溶着ボスを加熱する当接面の裏側に熱電対を放電溶接等により固定して溶着チップと一体化したことにより、熱電対はその周囲から溶着チップで保護されるため、汚れがつきにくく、また、リード線も溶着チップ内に配線されるため、他の部品等により切断されたりしない。熱電対を固定する位置は、当接面の裏側の中心が望ましい。
【００１３】
溶着チップの側面には、対向する面にスリットを形成し、そのスリットで分割された各側面に電圧を印加するための端子または電線を電気的に接続する。さらに、スリットは、溶着チップを冷却するため溶着チップの内部に吹き付けた冷却用エアーを外部へ排出する機能をも持つ。
以上の構成により、溶着チップを含む本発明の発熱体ユニットは、溶着チップの内部である当接面の裏面に熱電対を固定したことにより、かしめ時の加熱温度を直接測定でき、また、熱電対を外部に引き出す必要がなくなる。
さらに、溶着チップに固定された熱電対と温度制御部とを組み合わせることにより、溶着チップの温度制御が容易になる。併せて、冷却時の温度変化等も測定できるため、最も良い条件での溶着部の冷却が可能となり、作業の能率化に寄与できる。
【００１４】
請求項２の熱可塑性樹脂成形品のかしめ固定に用いる熱溶着装置においては、請求項１に記載の溶着チップを具備する発熱体ユニットにおいて、溶着チップに電圧印加をするための端子、及び、熱電対の端末に設けた端子などを収納するハウジングを用いる。一方、発熱体ユニット受け（グリップ）には、電源装置へ接続された接続ケーブルのハウジングを設ける。したがって、各ハウジング同士を接続または離脱することにより、容易に発熱ユニットと発熱体ユニット受け（グリップ）との脱着が可能となる。この構成により、メンテナンスや溶着ボスの形状変化に伴う発熱体ユニットの交換が容易にできる。
【００１５】
更に、請求項３に記載の発明においては、温度調整付熱溶着装置に接続された電源装置は、溶着チップに固定された熱電対の温度測定値を用いてライン電源を調整するサイリスタを制御する。詳しくは、ライン電源の波形の一部をトライアックによってＯＮ／ＯＦＦして溶着チップに印加する電圧を設定することができる温度制御部を内蔵している。したがって、事前に溶着温度を制御回路へ入力しておけば、所望する熱溶着条件を容易に設定することが出来る。
【００１６】
【発明の実施の形態】
各図に基づいて本発明の熱可塑性樹脂成形品の熱溶着装置について説明する。
【００１７】
【実施例１】
請求項１に記載の発明に対応する実施例について説明する。
本実施例１では、発熱体ユニット受け（グリップ）と接続ケーブルを介して接続された電源装置とからなる温度調整付の熱溶着装置を紹介する
図１は本発明の実施例である発熱体ユニット受け１の全体図、図２は図１における破線の円で囲んだＡ部の部分断面図、図３は熱電対３０の加工図、図４は溶着チップ１１へ熱電対３０を取り付ける説明図、図５は温度調整付熱溶着装置１に用いた電源装置４である。
【００１８】
以下、各図に基づいて説明する。
図１は、発熱体ユニット受け１の外観を示しており、グリップ２、電源装置４（図５参照）との接続コード３、発熱体ユニット１０とからなっている。グリップ２の内部には、接続コード３と発熱体ユニット１０を組み込み、内部で接続コード３と発熱体ユニット１０の各線を接続している。かしめ時はグリップ２を握って発熱体ユニット１０を溶着ボスに押し当ててかしめ作業を行う。
図２は図１におけるＡ部の断面を示している。発熱体ユニット１０の中心をなす溶着チップ１１は、中空のカップ形状をしており、溶着ボスへ押しつける当接面１２は半円球状の凹面をなし、当接面１２の裏側には、熱電対３０を放電溶接により取り付けている。
【００１９】
溶着チップ１１の側面には、当接面１２付近から他端面に向かって対向面２箇所にスリット１３が形成されている。また、溶着チップ１１の他端面部には、その側面に一対の電線１４を溶接等により取り付けて溶着チップ１１への電圧印加を可能としている。さらに、他端面の開口部には、セラミックからなる絶縁性を有する支持部材１５を具備し、支持部材１５には大小２つの貫通孔１５ａ、１５ｂを設けている。大きい貫通孔１５ａは冷却用エアーを溶着チップ１１の内部へ吹き付けるためのパイプ１６を挿入し、小さい貫通孔１５ｂへは熱電対３０を貫通させている。
【００２０】
前記の様に、熱電対３０、電線１４、支持部材１５、パイプ１６を組み込んだ溶着チップ１１の周囲には、耐熱樹脂（例えば、金属粉入りエポキシ樹脂）からなるカバー１７により被覆固定して発熱体ユニット１０を完成させている。
以上の構成からなる発熱体ユニット１０をグリップ２の先端に取り付け、図１に示すようにグリップ２内で、発熱体ユニット１０を構成する電線１４、パイプ１６、熱電対３０を接続コード３へ集約して接続する。
したがって、熱電対３０がグリップ２の外に出ることがなく、作業時に汚れたり、かしめ時に他の部品に引っかかる危険性がない。
【００２１】
図３は、熱電対３０における加工図である。通常熱電対３０は２つの異なる金属線３２ａ、３２ｂと、金属線３２ａ、３２ｂが交わる接触点３３と、金属線３２ａ、３２ｂを被覆絶縁するフッ素樹脂被覆３４ａ、３４ｂ、そして２本のフッ素樹脂被覆３４ａ、３４ｂをまとめるシース３５からなっている（以下、「リード線」と称しているときは、金属線３２ａ、３２ｂ、フッ素樹脂被膜３４ａ、３４ｂ、シース３５を総称している）。熱電対３０の接触点３３を当接面１２の裏側に取り付ける時、その部分の空間が狭く金属線３２にフッ素樹脂被膜３４ａ、３４ｂがあると入らないため、フッ素樹脂被覆３４ａ、３４ｂを取り除いて裸の金属線３２ａ、３２ｂへ加工する。そのため金属線３２ａ、３２ｂ同士が接触点３３以外で接触するおそれがあり、その結果、測定場所と異なる場所を測定してしまう場合がある。
したがって、接触を防止するため、２本の金属線３２ａ、３２ｂ間にエポキシ樹脂等により絶縁スペーサ１８（図４参照）を形成した。
【００２２】
図４は、図３の様に絶縁加工した熱電対３０を溶着チップ１１の当接面１２の裏側に取り付けた図である。本実施例では放電により取り付けを行った。接触点３３の取り付け位置は、正確な測定値を求めるため当接面３３の中心とした。
次に、発熱体ユニット受け１に接続コード３を介して接続する電源装置４を図５に基づいて説明する。
本実施例における電源装置４は、商用電源電圧を溶着チップ１１へ印加するため適宜な電圧に変換するトランス４１、温度制御部４２、冷却用エアーの回路を開閉する電磁弁４３からなる。
【００２３】
さらに温度制御部４２について説明すると、熱電対３０からの測定値を増幅回路４４へ入力し、その出力をＡＤコンバーター４５へ入力する。ＡＤコンバータ４５へは制御回路４６が接続されており、温度制御部４２の総合的な制御を行う。ＡＤコンバータ４５からはその出力をフォトカプラーを主とするトライアック制御回路４７と電磁弁４３とへ接続されている。
トライアック４８は、入力された商用電源（例えばＡＣ１００Ｖ）の交流波形を一部削除（例えば５０サイクルの内、途中のサイン波形を削除してサイクル数を減少させる）して平均電力が少なくなった交流（ＡＣ１００Ｖ）が出力する機能を持つ。この削除する場所の制御は、トライアック４８のゲート電流を流すタイミングを制御することが可能で、その制御をトライアック制御回路４７が行う。
【００２４】
４９は安全措置で、トランス４１一次側へ電源を供給または遮断の切り替えを行う他に、設定した通電時間を何らかの原因で越えた異常事態を検知しトランス４１への電源供給を遮断する機能を持つ。
電磁弁４３は、冷却用エアーを発熱体ユニット受け１へ送り込む切り替えをＡＤコンバータ４５からの信号で行う。
制御回路４６へは設定した温度になると電圧印加を停止する方法や時間と共に変化する温度カーブを予め設定しておき、熱電対３０の測定値と比較して制御するなど制御方法を予め入力しておくことができる。
【００２５】
次に、本実施例による温度調整付熱溶着装置を用いたかしめ方法（熱溶着方法）を図６に基づいて説明する。
本実施例では、時間と共に発熱体へ印加する電圧を設定しておき、最終設定温度になったことを熱電対３０からの測定値で検知したら電圧印加を停止する制御方法とした。本実施例では溶着ボス５ａを一体成形した成形品５の樹脂にＰＰ樹脂を用いたので、溶着チップ１１の当接面１２温度が最終的に２３０℃に上昇したとき電圧印加を停止し、同時に冷却用エアーを所定時間溶着チップの裏側へ吹き付けるかしめ方法を制御回路４６へ入力した。
【００２６】
まず、被固定物６の固定孔６ａから突き出た溶着ボス５ａの天面に溶着チップ１１を押しつけ保持する。スタート信号が制御回路４６へ入力されと、トライアック４８が作動してトランス４１の１次側に電圧が加わり、適宜な電圧が２次側に発生する。２次側電圧は接続コード３、電線１４を介して溶着チップ１１に印加して溶着チップ１１の当接面１２が発熱する。熱電対３０からの測定値が温度制御部４２で２３０℃に達したことを認識するとＯＦＦ信号をトライアック４８に送り出し溶着チップ１１への電圧を停止する。同時に電磁弁４３にも信号が伝わり電磁弁４３が開放すると冷却用エアー７が接続コード３、パイプ１６を通って溶着チップ１１の裏側に吹き付けられ溶着チップ１１を急速に冷却する。冷却用エアー７はその後、溶着チップ１１の側面に形成されたスリット１３から外部に放出さるので効率の良い冷却が可能になる。十分に溶着ボス５ａが冷却されたら冷却用エアー７の吹き付けを停止すると共に発熱体ユニット受け１を離脱し、被固定物６がかしめ固定された成形品５を取り出してかしめ作業が終了する。
【００２７】
以上の様に本実施例の温度調整付熱溶着装置は、熱電対３０で溶着チップ１１における当接面１２の温度を制御しているので、溶融ボス５ａの樹脂にとって最適な温度に制御でき熱分解温度に達することなく高品質のかしめ固定を得ることができる。
本実施例では、発熱体ユニット受け１のグリップ２を握って溶着チップ１１を溶着ボスに押し当てていたが、自動化等のため、シリンダーを用いて押し当てる場合がある。その時はグリップ２を使用しないで発熱体ユニット１０を直接シリンダーに取り付けてかしめ固定を行うが、発熱体ユニット１０からの各線は中継端子を用いることにより実施例と同様な効果を得ることができる。
【００２８】
【実施例２】
請求項２に記載の発明に対応する実施例について説明する。
図７は本発明の他の実施例である部分断面平面図、図８は部分断面側面図、図９は側面外観図、図１０は接触子Ａの説明図、図１１は接触子Ｂと接触子Ｃの説明図である。
本実施例２は、発熱体ユニット５０が発熱体ユニット受け１から容易に着脱自在とした構造が特徴である。なお、図７，図８、図９は、図１におけるＡ部の部分を示している。
【００２９】
図７、図８に基づいて説明すると、５１は本実施例における溶着チップで、熱電対３０を当接面５２の裏側に取り付けたことや、側面にスリット５３を形成したことについては実施例１と同じであるが、溶着チップ５１の後部（当接面から他端側）において肉厚を厚くし、実施例１における電線１４の代わりに、一対の円柱突起５４をスリット５３を挟んで対面的に一体成形している。
６０は溶着ユニット５０における溶着チップ５１の後部へ取り付ける中継ハウジンッグＡで、パイプ１６のノズル付近を抱き込む収納部Ａ６１と、接触子Ａ６２（図８参照）を一対具備している。接触子Ａ６２について説明すると、図１０に外観を示すが一端は熱電対３０をかしめ固定するかしめ部６２ａと他端は後述するソケットへ挿入して電気的に導通するピン６２ｂとで構成されている。
【００３０】
７０はグリップ２に取り付ける中継ハウジンッグＢで、中央部にパイプを貫通して保持するための貫通孔７１と、貫通孔７１の両側には、一対の接触子Ｂ７２（電圧印加用）、他方には一対の接触子Ｃ７３（熱電対用）（図８参照）を具備している。接触子Ｂ７２と接触子Ｃ７３を図１１を用いて説明すると、接触子Ｂ７２は一端に溶着チップ５１の円柱突起５４を受ける中空部７２ａを形成すると共に他端は接続コード３の一部である電圧印加用電線３ａをかしめるかしめ部７２ｂを形成している。さらに、接触子Ｃ７３は、中継ハウジングＡ６０の接触子Ａ６４のピン６２ｂを受ける中空部７３ａを形成し、他端は接続コード３の一部である熱電対用電線３ｂをかしめるかしめ部７３ｂを形成している。
中継ハウジンングＡ６０と中継ハウジングＢ７０は、樹脂材料としてポリエーテルエーテルケトン樹脂（ＰＥＥＫ樹脂）を用い、成形時には各接触子６２，７２，７３をインサート成形して一体としている。
【００３１】
図９に示す本実施例の側面外観図の様に、熱電対３０のリード線３１は、冷却用エアー５がパイプ１６のノズルから吹き出した時邪魔にならないようにスリット５３から外部に出してから接触子Ｃ６２に接続することが望ましい。
以上の構成により溶着ユニット５０の中継ハウジンングＡ６０と溶着チップ１１１の一部であるグリップ２に取り付けられた中継ハウジンングＢ７０とにより発熱体ユニット受け１との脱着が容易になった。したがって、溶着ボスの大きさが変わった時や溶着ユニット５０のメンテナンスの時など容易に脱着ができる効果を得られる。
本実施例２による熱溶着装置を用いたかしめ方法についは、実施例１と同一なのでここでの説明は省略する。
【００３２】
【発明の効果】
本発明の熱可塑性樹脂成形品のかしめ固定に用いる熱溶着装置は、溶着チップを中空状の金属製のカップ形状にし、溶着ボスに当接させる溶着チップの当接面裏側に熱電対を取り付け、さらに、溶着チップを含む発熱体ユニットを発熱体ユニット受けから容易に着脱自在な構造としたため、次の様な効果を得ることができる。
ａ．熱電対を溶着ボスの当接面の裏側に取り付けたため、当接面の温度を直接計測することができ、その測定値により当接面の温度を制御することができ、したがって、樹脂を溶融するのに適した温度に加熱してかしめ固定ができるため、かしめ強度の安定した高品質の熱溶着物を提供できる。
ｂ．溶着チップが摩耗してくると、抵抗値が高くなり、温度上昇が急激になるため、溶着チップの耐久に悪い影響が出るようになるが、この見極めができる。ｃ．温度管理ができるため、常温に戻ったことを検知してから溶着チップを離脱することが確実にできる。したがって、糸引き、溶着チップへの樹脂の食らい
つき等を防止できる。
ｄ．経過時間ごとに温度測定ができるため、適切な溶着条件を容易に設定できる
。
ｆ．熱電対のリード線が発熱体ユニットの外部に出ないため、熱電対の汚れやリード線の切断の心配がないと共に溶着ボスの周囲に接近する部材があっても熱
電対のリード線が引っかかったりする心配がない。
ｇ．発熱体ユニットと熱溶着装置との接続が中継ハウジングを用いて行っているので、脱着が容易になり発熱体ユニットの交換やメンテナンスが簡単にできる
。
ｈ．熱電対で冷却時の温度変化を測定することもできるため、冷却を効率的に、
安定して行うことができる。この結果、能率的な生産が可能になる。
【図面の簡単な説明】
【図１】実施例１における発熱体ユニット受けの全体図。
【図２】図１におけるＡ部の部分断面図。
【図３】熱電対におけるリード線の加工図。
【図４】溶着チップへ熱電対を取り付ける説明図。
【図５】実施例１における熱溶着装置に用いた電源装置。
【図６】実施例１におけるかしめ固定方法の説明図。
【図７】実施例２における発熱体ユニット受けの部分断面平面図。
【図８】実施例２における発熱体ユニット受けの部分断面側面図。
【図９】実施例２における発熱体ユニット受けの外観図。
【図１０】実施例２における接触子Ａの説明図。
【図１１】実施例２における接触子Ｂと接触子Ｃの説明図
【符号の説明】
１ 発熱体ユニット受け
２ グリップ
３ 接続コード
４ 電源装置
５ 成形品
６ 被固定物
７ 冷却用エアー
１０、５０ 発熱体ユニット
１１、５１ 溶着チップ
１２、５２ 当接面
１３、５３ スリット
１６ パイプ
３０ 熱電対
３３ 接触点
４１ トランス
４２ 温度制御部
４８ トライアック
６０ 中継ハウジングＡ
６２ 接触子Ａ
７０ 中継ハウジングＢ
７２ 接触子Ｂ
７３ 接触子Ｃ[0001]
BACKGROUND OF THE INVENTION
The present invention inserts and penetrates a welding boss formed on a thermoplastic resin molded article into a fixing hole formed on the fixed object side, and heats and presses the tip of the deformed portion of the welding boss protruding from the fixing hole with a welding tip. The present invention relates to a heat welding apparatus for a thermoplastic resin molded product used when forming a huge portion having a diameter larger than that of a fixing hole to fix an object to be fixed to a molded product.
[0002]
[Prior art]
As a method of thermally welding molded articles made of thermoplastic resin, a heat caulking welding method by heating an electric heating element is known.
What is important in this thermal caulking welding method is that by selecting an appropriate heating temperature, for example, if the heating temperature is high and heat higher than the thermal decomposition temperature in the resin material of the molded product is applied, the caulking part becomes brittle and the welding strength is reduced. There is a risk of decline. On the other hand, if the heating temperature is low, it is not sufficiently melted, so that the deformation of the caulking portion does not have a desired shape, and sufficient welding strength may not be obtained. Therefore, optimal management of the temperature of the welding surface of the welding tip is important in heat staking welding.
[0003]
A conventional heat caulking method by heating a heating element will be described in detail. First, a welding boss integrally formed with a molded product is passed through a fixing hole formed on the fixed object side. Next, the tip end side of the deformed portion of the welding boss protruding from the fixed hole is heated and melted by a heating element to form a huge portion larger than the fixed hole. By this enormous portion, the object to be fixed can be heat caulked and fixed (welded) to the molded product.
For example, a semicircular recess that melts and deforms the welding boss is formed on the front end surface of a heat rod incorporated in the heater.
[0004]
When caulking, the heat boss is pressed against the welding boss and heated, so that the welding boss gradually melts from the contact surface with the heat rod, and the molten resin fills the inside of the concave space that is semicircular. Go. As a result, the deformed portion of the welding boss is enlarged and deformed into a huge portion larger than the diameter of the fixed hole. Then, after cooling the hot rod or removing the hot rod, by blowing cooling air or the like, the enormous part is solidified, and as a result, the object to be fixed is fixed by heat caulking to the molded product. become.
[0005]
In the above heat caulking method, it is the temperature of the heat stick that affects the caulking strength. That is, if the temperature is low, it is not sufficiently melted, so that the deformation is not performed completely. If the temperature is too high, the thermal decomposition temperature is reached and the caulking strength may be adversely affected. Therefore, conventionally, various factors such as voltage application time, voltage application ON-OFF cycle, voltage value of applied voltage, etc. are tested in advance so that the heating rod reaches the optimum temperature for heat staking. The fixed condition is fixed.
[0006]
However, in order to guarantee the quality of the caulking (welding) strength, it is important to measure and monitor the temperature of the contact surface when the hot rod comes into contact with the welding boss when performing the caulking fixing work. As an example of this, for example, Japanese Patent Laid-Open No. 2001-150554 provides an invention for measuring the temperature of a hot rod with a thermocouple.
The contents are that the thermocouple is fixed to the heater, and further, the heat (temperature) of the heater is fixed by fixing the thermocouple to the outer periphery of the heater at a plurality of locations such as near or away from the connection with the thermocouple by a holding member. This is a method of detecting the temperature with a thermocouple and controlling the temperature of the heater by a feedback method.
[0007]
[Problems to be solved by the invention]
According to the above known invention, since the thermocouple is fixed to the heater, the temperature of the heater can be measured, and the temperature of the heater can be controlled by introducing the measured value to the control circuit.
However, since the thermocouple is fixed to the outer peripheral portion of the heater, and the thermocouple is fixed to the outside of the heater by the pressing member, the following problems occur.
1. Since the thermocouple is fixed to the outer periphery of the heater, the temperature of the abutting surface that abuts the welding boss is not measured. In general, the thickness of the side surface is increased in order to obtain strength and to make the portion that generates heat only the contact surface (difference in resistance value). For this reason, the temperature difference from the contact surface becomes large, which is different from the actual heating temperature applied to the welding boss.
2. Because the thermocouple is placed outside the welding device, the thermocouple is exposed, so it is easy to get dirty and the lead wire to break, and other parts, etc. approach the area around the crimped area. If this occurs, the thermocouple may be caught or pushed down by the component, resulting in troubles in the caulking operation, and the component may be damaged.
3. When this welded part is forcibly cooled after welding with a heater, the cooling temperature of the welded part cannot be measured, but even if it is possible, the accuracy is poor.
[0008]
The present invention is provided in view of the above drawbacks, and by accurately measuring the temperature of the contact surface of the heating element that contacts the welding boss (welding tip), the welding temperature is adjusted to the welding conditions. Proper management and high-quality caulking are possible, and the thermocouple is not contaminated, the lead wire is broken, and it does not get caught in parts during work. An object of the present invention is to provide a thermal welding apparatus that can be set and used to improve the efficiency of welding work.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in the heat welding apparatus for a thermoplastic resin molded product, the front end side of the welding boss integrally molded with the thermoplastic resin molded product is softened by the heat of the welding tip. Alternatively, in a thermal welding apparatus that deforms by melting and crimps and fixes an object to be fixed to the thermoplastic resin molded product, a thermoelectric device is used to measure the temperature of the contact surface on the back side of the contact surface of the weld tip. A pair is attached and a temperature signal output from the thermocouple is received by the temperature control unit of the welding tip to enable temperature control of the contact surface of the welding tip.
[0010]
Furthermore, the invention described in claim 2 is characterized in that, in the invention described in claim 1, the heating element unit including the welding tip has a structure that can be easily detached from the heat welding apparatus. .
[0011]
Further, in the invention according to claim 3, in the invention according to claim 1 and claim 2, controlling the TRIAC of the temperature control unit built in the power supply device based on the temperature measurement of the welding tip by the thermocouple, The voltage applied to the welding tip is controlled.
[0012]
[Action]
In the heat welding apparatus for a thermoplastic resin molded article according to claim 1, the welding tip is formed into a cup shape made of a hollow metal, and the welding boss is heated in contact with the welding boss inside the welding tip. By fixing the thermocouple on the back side of the contact surface by discharge welding etc. and integrating it with the welding tip, the thermocouple is protected from the surroundings with the welding tip, so it is difficult to get dirty, and the lead wire is also a welding tip Since it is wired inside, it is not cut by other parts. The position where the thermocouple is fixed is preferably the center on the back side of the contact surface.
[0013]
On the side surface of the welding tip, a slit is formed on the opposite surface, and a terminal or an electric wire for applying a voltage is electrically connected to each side surface divided by the slit. Further, the slit has a function of discharging cooling air blown to the inside of the welding tip to cool the welding tip.
With the above configuration, the heating element unit of the present invention including the welding tip can directly measure the heating temperature during caulking by fixing the thermocouple to the back surface of the abutting surface inside the welding tip. There is no need to pull the pair out.
Furthermore, by combining the thermocouple fixed to the welding tip and the temperature control unit, the temperature control of the welding tip becomes easy. In addition, since the temperature change at the time of cooling can be measured, the welded part can be cooled under the best conditions, which can contribute to the efficiency of the work.
[0014]
In a heat welding apparatus used for caulking and fixing a thermoplastic resin molded article according to claim 2, in a heating element unit comprising the welding tip according to claim 1, a terminal for applying a voltage to the welding chip, and a thermoelectric device A housing for storing terminals provided on the pair of terminals is used. On the other hand, the heating element unit receptacle (grip) is provided with a housing for a connection cable connected to the power supply device. Therefore, by connecting or disconnecting the housings, the heat generating unit and the heat generating unit receiver (grip) can be easily attached and detached. With this configuration, it is possible to easily replace the heating element unit due to maintenance or a change in the shape of the welding boss.
[0015]
Furthermore, in the invention according to claim 3, the power supply device connected to the temperature-adjusting heat welding apparatus controls the thyristor for adjusting the line power supply using the temperature measurement value of the thermocouple fixed to the welding tip. . More specifically, a temperature control unit is incorporated which can set a voltage to be applied to the welding chip by turning on / off a part of the waveform of the line power supply by a triac. Therefore, if the welding temperature is input to the control circuit in advance, desired heat welding conditions can be easily set.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Based on each figure, the thermal welding apparatus of the thermoplastic resin molded product of this invention is demonstrated.
[0017]
[Example 1]
An embodiment corresponding to the invention described in claim 1 will be described.
In the first embodiment, FIG. 1 which introduces a heat welding apparatus with temperature adjustment composed of a heating element unit receiver (grip) and a power supply device connected via a connection cable is shown in FIG. 1 as a heating element unit according to an embodiment of the present invention. FIG. 2 is a partial sectional view of a portion A surrounded by a broken-line circle in FIG. 1, FIG. 3 is a processing diagram of the thermocouple 30, and FIG. 4 is an explanatory diagram for attaching the thermocouple 30 to the welding tip 11. FIG. 5 shows the power supply device 4 used in the thermal welding device 1 with temperature adjustment.
[0018]
Hereinafter, description will be given based on each drawing.
FIG. 1 shows the external appearance of the heating element unit receiver 1 and includes a grip 2, a connection cord 3 with a power supply device 4 (see FIG. 5), and a heating element unit 10. The connection cord 3 and the heating element unit 10 are incorporated inside the grip 2, and the wires of the connection cord 3 and the heating element unit 10 are connected inside. At the time of caulking, the grip 2 is held and the heating element unit 10 is pressed against the welding boss to perform caulking work.
FIG. 2 shows a cross section of a portion A in FIG. The welding tip 11 that forms the center of the heating element unit 10 has a hollow cup shape, and the contact surface 12 that presses against the welding boss has a semispherical concave surface. 30 is attached by electric discharge welding.
[0019]
On the side surface of the welding tip 11, slits 13 are formed at two locations on the opposing surface from the vicinity of the contact surface 12 toward the other end surface. Further, a pair of electric wires 14 are attached to the side surface of the other end surface of the welding tip 11 by welding or the like, so that a voltage can be applied to the welding tip 11. Furthermore, the opening part of the other end surface is provided with an insulating support member 15 made of ceramic, and the support member 15 is provided with two large and small through holes 15a and 15b. A large through hole 15a is inserted with a pipe 16 for blowing cooling air into the welding tip 11, and a thermocouple 30 is passed through the small through hole 15b.
[0020]
As described above, the periphery of the welding chip 11 incorporating the thermocouple 30, the electric wire 14, the support member 15, and the pipe 16 is covered and fixed by the cover 17 made of heat-resistant resin (for example, epoxy resin containing metal powder) to generate heat. The body unit 10 is completed.
The heating element unit 10 having the above configuration is attached to the tip of the grip 2, and the electric wires 14, pipes 16, and thermocouples 30 constituting the heating element unit 10 are integrated into the connection cord 3 in the grip 2 as shown in FIG. 1. And connect.
Therefore, the thermocouple 30 does not go out of the grip 2, and there is no risk of getting dirty during work or being caught by other parts during caulking.
[0021]
FIG. 3 is a processing diagram of the thermocouple 30. Usually, the thermocouple 30 has two different metal wires 32a and 32b, a contact point 33 where the metal wires 32a and 32b intersect, a fluorine resin coating 34a and 34b that covers and insulates the metal wires 32a and 32b, and two fluorine resin coatings. 34a and 34b (hereinafter referred to as “lead wire”, the metal wires 32a and 32b, the fluororesin coatings 34a and 34b, and the sheath 35 are collectively referred to). When the contact point 33 of the thermocouple 30 is attached to the back side of the contact surface 12, the space of the portion is so narrow that the metal wire 32 does not enter the fluororesin coatings 34 a and 34 b, so the fluororesin coatings 34 a and 34 b are removed. Processing into bare metal wires 32a and 32b. For this reason, the metal wires 32a and 32b may come into contact with each other at a point other than the contact point 33, and as a result, a place different from the measurement place may be measured.
Therefore, in order to prevent contact, the insulating spacer 18 (see FIG. 4) was formed between the two metal wires 32a and 32b with an epoxy resin or the like.
[0022]
FIG. 4 is a view in which the thermocouple 30 insulated as shown in FIG. 3 is attached to the back side of the contact surface 12 of the welding tip 11. In this embodiment, the attachment was performed by discharging. The attachment position of the contact point 33 is set to the center of the contact surface 33 in order to obtain an accurate measurement value.
Next, the power supply device 4 connected to the heating element unit receiver 1 via the connection cord 3 will be described with reference to FIG.
The power supply device 4 in this embodiment includes a transformer 41 that converts a commercial power supply voltage to an appropriate voltage for applying to the welding tip 11, a temperature control unit 42, and an electromagnetic valve 43 that opens and closes a cooling air circuit.
[0023]
Further, the temperature control unit 42 will be described. The measured value from the thermocouple 30 is input to the amplifier circuit 44 and the output is input to the AD converter 45. A control circuit 46 is connected to the AD converter 45 and performs comprehensive control of the temperature control unit 42. An output from the AD converter 45 is connected to a triac control circuit 47 mainly including a photocoupler and an electromagnetic valve 43.
Triac 48 is a part of the AC waveform of the commercial power supply (for example, AC 100V) that has been input (for example, by deleting the sine waveform in the middle of 50 cycles to reduce the number of cycles), the AC is reduced in average power (AC100V) has a function to output. This place of deletion can be controlled by controlling the timing at which the gate current of the triac 48 flows. The triac control circuit 47 performs this control.
[0024]
Reference numeral 49 denotes a safety measure, which supplies power to the primary side of the transformer 41 or switches between shut-offs, and has a function of detecting an abnormal situation exceeding the set energization time for some reason and shutting off the power supply to the transformer 41. .
The electromagnetic valve 43 performs switching to send cooling air to the heating element unit receiver 1 by a signal from the AD converter 45.
The control circuit 46 is preliminarily input with a control method such as a method for stopping the voltage application when the set temperature is reached, or a temperature curve that changes with time is set in advance, and the control is compared with the measured value of the thermocouple 30. I can leave.
[0025]
Next, a caulking method (thermal welding method) using the thermal welding apparatus with temperature adjustment according to the present embodiment will be described with reference to FIG.
In this embodiment, the voltage applied to the heating element with time is set, and when the final set temperature is detected from the measured value from the thermocouple 30, the voltage application is stopped. In this embodiment, PP resin is used as the resin of the molded product 5 in which the welding boss 5a is integrally formed. Therefore, when the temperature of the contact surface 12 of the welding tip 11 finally rises to 230 ° C., the voltage application is stopped and at the same time A caulking method for blowing cooling air to the back side of the welding tip for a predetermined time was input to the control circuit 46.
[0026]
First, the welding tip 11 is pressed and held against the top surface of the welding boss 5a protruding from the fixing hole 6a of the fixed object 6. When the start signal is input to the control circuit 46, the triac 48 is activated to apply a voltage to the primary side of the transformer 41, and an appropriate voltage is generated on the secondary side. The secondary side voltage is applied to the welding tip 11 via the connection cord 3 and the electric wire 14, and the contact surface 12 of the welding tip 11 generates heat. When the temperature control unit 42 recognizes that the measured value from the thermocouple 30 has reached 230 ° C., an OFF signal is sent to the triac 48 to stop the voltage to the welding tip 11. At the same time, when a signal is transmitted to the electromagnetic valve 43 and the electromagnetic valve 43 is opened, the cooling air 7 is blown to the back side of the welding tip 11 through the connection cord 3 and the pipe 16 to rapidly cool the welding tip 11. Thereafter, the cooling air 7 is discharged to the outside from the slit 13 formed on the side surface of the welding tip 11, so that efficient cooling is possible. When the welding boss 5a is sufficiently cooled, the blowing of the cooling air 7 is stopped, the heating element unit receiver 1 is detached, the molded product 5 on which the fixed object 6 is caulked and fixed is taken out, and the caulking operation is completed.
[0027]
As described above, in the thermal welding apparatus with temperature adjustment of the present embodiment, the temperature of the contact surface 12 of the welding tip 11 is controlled by the thermocouple 30, so that the temperature can be controlled to an optimum temperature for the resin of the molten boss 5a. High quality caulking can be obtained without reaching the decomposition temperature.
In this embodiment, the grip 2 of the heating element unit receiver 1 is gripped and the welding tip 11 is pressed against the welding boss. However, for automation, there is a case where it is pressed using a cylinder. At that time, the heating element unit 10 is directly attached to the cylinder and fixed by caulking without using the grip 2, but each line from the heating element unit 10 can obtain the same effect as the embodiment by using a relay terminal.
[0028]
[Example 2]
An embodiment corresponding to the invention described in claim 2 will be described.
7 is a partial cross-sectional plan view of another embodiment of the present invention, FIG. 8 is a partial cross-sectional side view, FIG. 9 is a side external view, FIG. 10 is an explanatory view of the contact A, and FIG. It is explanatory drawing of the child C. FIG.
The second embodiment is characterized by a structure in which the heating element unit 50 is easily detachable from the heating element unit receiver 1. 7, 8, and 9 show a portion A in FIG. 1.
[0029]
Referring to FIGS. 7 and 8, reference numeral 51 denotes a welding tip in the present embodiment. The thermocouple 30 is attached to the back side of the contact surface 52 and the slit 53 is formed on the side surface of the first embodiment. The thickness is increased at the rear portion (the other end side from the contact surface) of the welding tip 51, and a pair of cylindrical protrusions 54 are opposed to each other across the slit 53 instead of the electric wire 14 in the first embodiment. Are integrally molded.
Reference numeral 60 denotes a relay housing A attached to the rear portion of the welding tip 51 in the welding unit 50, and includes a pair of a storage portion A61 for embedding the vicinity of the nozzle of the pipe 16 and a contact A62 (see FIG. 8). The contact A62 will be described. Although the appearance is shown in FIG. 10, one end includes a caulking portion 62a for caulking and fixing the thermocouple 30 and the other end includes a pin 62b that is inserted into a socket, which will be described later, and is electrically connected. .
[0030]
Reference numeral 70 denotes a relay housing B attached to the grip 2, a through hole 71 for penetrating and holding the pipe in the center, a pair of contacts B 72 (for voltage application) on both sides of the through hole 71, and the other A pair of contacts C73 (for thermocouple) (see FIG. 8) is provided. The contact B 72 and the contact C 73 will be described with reference to FIG. 11. The contact B 72 forms a hollow portion 72 a that receives the cylindrical protrusion 54 of the welding tip 51 at one end, and the other end is a voltage that is a part of the connection cord 3. A caulking portion 72b for caulking the applying electric wire 3a is formed. Further, the contact C73 forms a hollow portion 73a that receives the pin 62b of the contact A64 of the relay housing A60, and the other end forms a caulking portion 73b that caulks the thermocouple wire 3b that is a part of the connection cord 3. is doing.
The relay housing A60 and the relay housing B70 use polyether ether ketone resin (PEEK resin) as a resin material, and the contacts 62, 72, 73 are integrally formed by insert molding at the time of molding.
[0031]
The lead wire 31 of the thermocouple 30 is taken out from the slit 53 so that it does not get in the way when the cooling air 5 is blown out from the nozzle of the pipe 16 as shown in the side view of this embodiment shown in FIG. It is desirable to connect to the contact C62.
With the above configuration, the relay housing A 60 of the welding unit 50 and the relay housing B 70 attached to the grip 2 that is a part of the welding tip 111 facilitate the attachment / detachment of the heating element unit receiver 1. Therefore, it is possible to obtain an effect that can be easily detached when the size of the welding boss is changed or when the welding unit 50 is maintained.
Since the caulking method using the heat welding apparatus according to the second embodiment is the same as that of the first embodiment, the description thereof is omitted here.
[0032]
【The invention's effect】
The heat welding apparatus used for caulking and fixing the thermoplastic resin molded article of the present invention is a hollow metal cup shape, and a thermocouple is attached to the back side of the welding chip contacting the welding boss, Furthermore, since the heating element unit including the welding tip is configured to be easily detachable from the heating element unit receiver, the following effects can be obtained.
a. Since the thermocouple is mounted on the back side of the contact surface of the welding boss, the temperature of the contact surface can be directly measured, and the temperature of the contact surface can be controlled by the measured value, thus melting the resin. Therefore, it is possible to provide a high-quality heat-welded product with stable caulking strength.
b. As the welding tip wears, the resistance value increases and the temperature rises rapidly, which adversely affects the durability of the welding tip, but this can be determined. c. Since the temperature can be controlled, it is possible to reliably remove the welding tip after detecting that the temperature has returned to room temperature. Therefore, it is possible to prevent stringing, resin biting on the welding tip, and the like.
d. Since temperature can be measured for each elapsed time, appropriate welding conditions can be easily set.
f. Because the thermocouple lead does not come out of the heating element unit, there is no worry about dirt on the thermocouple or cutting of the lead wire, and even if there is a member approaching the welding boss, the lead wire of the thermocouple may be caught. There is no worry to do.
g. Since the connection between the heat generating unit and the heat welding apparatus is performed using the relay housing, the heat generating unit can be easily attached and detached and the heat generating unit can be easily replaced and maintained.
h. The temperature change during cooling can also be measured with a thermocouple.
It can be performed stably. As a result, efficient production becomes possible.
[Brief description of the drawings]
FIG. 1 is an overall view of a heating element unit receiver in Embodiment 1. FIG.
FIG. 2 is a partial cross-sectional view of a portion A in FIG.
FIG. 3 is a processing diagram of lead wires in a thermocouple.
FIG. 4 is an explanatory diagram for attaching a thermocouple to a welding tip.
FIG. 5 is a power supply device used in the heat welding apparatus according to the first embodiment.
6 is an explanatory diagram of a caulking fixing method in Embodiment 1. FIG.
7 is a partial sectional plan view of a heating element unit receiver in Embodiment 2. FIG.
8 is a partial cross-sectional side view of a heating element unit receiver in Embodiment 2. FIG.
9 is an external view of a heating element unit receiver in Embodiment 2. FIG.
10 is an explanatory diagram of a contact A in Embodiment 2. FIG.
FIG. 11 is an explanatory diagram of a contact B and a contact C according to the second embodiment.
DESCRIPTION OF SYMBOLS 1 Heating unit receiver 2 Grip 3 Connection cord 4 Power supply 5 Molded product 6 Fixed object 7 Cooling air 10, 50 Heating unit 11, 51 Welding chip 12, 52 Contact surface 13, 53 Slit 16 Pipe 30 Thermocouple 33 Contact point 41 Transformer 42 Temperature controller 48 Triac 60 Relay housing A
62 Contact A
70 Relay housing B
72 Contact B
73 Contact C

Claims (3)

熱可塑性樹脂成形品に一体成形された溶着ボスの先端側を溶着チップの熱で軟化又は溶融することにより変形して被固定物を前記熱可塑性樹脂成形品にかしめ固定する熱溶着装置において、前記溶着チップの当接面の裏側に、この当接面の温度を測定するために熱電対を取り付けると共にこの熱電対から出力される温度信号を溶着チップの温度制御部に受け入れて溶着チップにおける当接面の温度制御を可能にしたことを特徴とする熱可塑性樹脂成形品の熱溶着装置。In the heat welding apparatus for deforming the tip end side of the welding boss integrally formed with the thermoplastic resin molded product by softening or melting with the heat of the welding tip and caulking and fixing the object to be fixed to the thermoplastic resin molded product, A thermocouple is attached to the back side of the contact surface of the welding tip to measure the temperature of the contact surface, and a temperature signal output from the thermocouple is received by the temperature control unit of the welding tip to contact the welding tip. A heat welding apparatus for a thermoplastic resin molded product, characterized in that the surface temperature can be controlled. 前記溶着チップを具備する発熱体ユニットが熱溶着装置から容易に脱着自在な構造であることを特徴とする請求項１に記載の熱可塑性樹脂成形品の熱溶着装置。The heat welding apparatus for a thermoplastic resin molded article according to claim 1, wherein the heating element unit including the welding tip has a structure that can be easily detached from the heat welding apparatus. 前記熱電対による前記溶着チップの温度測定に基づき電源装置に内蔵した温度制御部のトライアックを制御して溶着チップに印加する電圧を制御することを特徴とする電源装置を持つ請求項１及び請求項２に記載の熱可塑性樹脂成形品の熱溶着装置。2. The power supply apparatus according to claim 1, wherein a voltage applied to the welding chip is controlled by controlling a triac of a temperature control unit built in the power supply apparatus based on a temperature measurement of the welding chip by the thermocouple. 2. A thermal welding apparatus for a thermoplastic resin molded article according to 2.
JP2002257818A 2002-09-03 2002-09-03 Thermo welding equipment for thermoplastic resin molded products Expired - Lifetime JP3733348B2 (en)

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