JP2003181937A - Method and apparatus for heat-fusion-bonding thermoplastic resin molding - Google Patents

Method and apparatus for heat-fusion-bonding thermoplastic resin molding

Info

Publication number
JP2003181937A
JP2003181937A JP2001379679A JP2001379679A JP2003181937A JP 2003181937 A JP2003181937 A JP 2003181937A JP 2001379679 A JP2001379679 A JP 2001379679A JP 2001379679 A JP2001379679 A JP 2001379679A JP 2003181937 A JP2003181937 A JP 2003181937A
Authority
JP
Japan
Prior art keywords
heat
heating element
voltage
resistance heating
thermoplastic resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001379679A
Other languages
Japanese (ja)
Other versions
JP3737966B2 (en
Inventor
Hajime Okamoto
一 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku Munekata Co Ltd
Original Assignee
Tohoku Munekata Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tohoku Munekata Co Ltd filed Critical Tohoku Munekata Co Ltd
Priority to JP2001379679A priority Critical patent/JP3737966B2/en
Publication of JP2003181937A publication Critical patent/JP2003181937A/en
Application granted granted Critical
Publication of JP3737966B2 publication Critical patent/JP3737966B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • B29C65/18—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
    • B29C65/78—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
    • B29C66/40—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
    • B29C66/80—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
    • B29C66/818—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
    • B29C66/914—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
    • B29C66/9141—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 temperature
    • B29C66/91421—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 temperature of the joining 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
    • 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
    • B29C66/91641—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 the heat or the thermal flux being non-constant over time
    • B29C66/91643—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 the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—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 the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • 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
    • B29C66/9192—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 in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—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 in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—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 in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of 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
    • B29C66/90—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
    • B29C66/9192—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 in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91951—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 in explicit relation to another variable, e.g. temperature diagrams in explicit relation to time, e.g. temperature-time diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently set a strength of a heat fusion bonding expanded part and to obtain a beautiful appearance by uniformly controlling a heating temperature distribution of a resistance heater. <P>SOLUTION: A method for heat-fusion-bonding a thermoplastic resin molding comprises the steps of dividing a voltage applying part to the resistance heater 10 into two blocks, alternatively applying a voltage to the two blocks, and delaying a time of 0.3 to 1.0 s to timing of alternatively applying the voltage. Thus, directions of current flowing to the heater 10 become two ways, the heating temperature is averaged, a heat fusion bonding part is suitably melted by the averaging to assure a strength, and hence the appearance of the fusion bonded part can be obtained. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、熱可塑性樹脂成形
品と他部材（被固定物）とを固定する際、熱可塑性樹脂
成形品の一部に変形部を形成し、この変形部を熱で溶融
して変形させることにより、前記成形品に被固定物をか
しめ留めする熱可塑性樹脂成形品の熱溶着方法及びその
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when fixing a thermoplastic resin molded product and another member (an object to be fixed), forms a deformed portion in a part of the thermoplastic resin molded product and heats the deformed portion. The present invention relates to a method and apparatus for heat-sealing a thermoplastic resin molded product in which an object to be fixed is caulked and fixed to the molded product by melting and deforming.

【０００２】[0002]

【従来の技術】従来、熱可塑性樹脂で成形された成形品
に被固定物を固定する場合、先ず、成形品に一体成形さ
れた熱溶着用ボスを被固定物側に貫通して形成した固定
孔へ通し、次に、この固定孔から突き出た熱溶着用ボス
の変形部に熱溶着用溶融ヘッド（以下「溶融ヘッド」と
称す）の当接面を押し付けて加熱し、更に、その熱で変
形部を溶融して固定孔の直径より大きい直径からなる溶
融した膨大部を形成し、この膨大部を冷却硬化して成形
品に被固定物をかしめ留めする熱溶着方法が一般的であ
る。2. Description of the Related Art Conventionally, when fixing an object to be fixed to a molded article molded of a thermoplastic resin, first, a fixing is formed by penetrating a heat-welding boss integrally formed with the molded article to the side of the object to be fixed. After passing through the hole, the contact surface of the heat-welding melting head (hereinafter referred to as the “melting head”) is pressed against the deformed portion of the heat-welding boss protruding from this fixing hole to heat it. A general method is a heat welding method in which the deformed portion is melted to form a molten expanded portion having a diameter larger than the diameter of the fixing hole, and the expanded portion is cooled and hardened to caulk and fasten the fixed object to the molded product.

【０００３】この熱溶着方法において、変形部の溶融に
用いられる溶融ヘッドとしては、電圧を印加して電気的
抵抗によりジュール熱を発生させる発熱体（以下「抵抗
発熱体」と称する）を用いると良い熱溶着精度が得られ
且つコントロールも容易に行うことができる。さらに、
溶融した変形部を冷却する方法として、変形部の溶融
後、抵抗発熱体の内部に冷却用エアーを吹きかけること
により、溶融した変形部を短時間で硬化することができ
る。In this heat welding method, as a melting head used for melting the deformed portion, a heating element (hereinafter referred to as "resistance heating element") for applying a voltage to generate Joule heat by electric resistance is used. Good heat welding accuracy can be obtained and control can be easily performed. further,
As a method for cooling the melted deformed portion, the melted deformed portion can be cured in a short time by blowing cooling air into the resistance heating element after melting the deformed portion.

【０００４】一方、抵抗発熱体における当接面の面積が
広い場合、電流の流れる方向が一方向であれば電圧印加
部間の中心部分が他の部分に比べて高温になり、よって
当接面において温度分布が不均一になる場合がある。こ
のような抵抗発熱体を用いて溶着作業を行った場合、変
形部を加熱しても均一に溶融されず、例えば、変形部の
中心部分が溶融温度を超えて加熱されたりするため、変
形部はその中心部分において熱分解を発生し、それ以外
の部位は逆に溶融温度に達しないと云う現象が発生して
所望する膨大部を形成できなかったり、所望するかしめ
強度が得られなかったり、膨大部の仕上がりが良くない
と云った現象が発生する時がある。On the other hand, when the area of the contact surface of the resistance heating element is large, the temperature of the central portion between the voltage applying portions becomes higher than that of the other portions when the direction of current flow is one direction. In some cases, the temperature distribution becomes uneven. When welding work is performed using such a resistance heating element, even if the deformed portion is heated, it is not melted uniformly, and for example, the center portion of the deformed portion is heated above the melting temperature. Causes thermal decomposition in its central part, and the other parts do not reach the melting temperature, so that a desired enlarged part cannot be formed, or desired caulking strength cannot be obtained, Occasionally, a phenomenon occurs that the finish of the enormous volume is not good.

【０００５】[0005]

【発明が解決しようとする課題】本発明の課題は、抵抗
発熱体の当接面の面積が広い場合でも全面において均一
に発熱することにより、強度的、外観的に満足する膨大
部を形成することができる熱可塑性樹脂成形品の熱溶着
方法及びその装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to form an enormous portion which is satisfactory in strength and appearance by uniformly generating heat over the entire surface even if the contact surface of the resistance heating element is large. It is an object of the present invention to provide a method for thermally welding a thermoplastic resin molded article and an apparatus therefor.

【０００６】[0006]

【課題を解決するための手段】上記課題（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方法おいて、抵抗発熱体に対して交
流電圧を印加することによりこの抵抗発熱体を発熱さ
せ、この熱で熱可塑性樹脂成形品に形成した変形部を溶
融することにより、被固定物を前記熱可塑性樹脂成形品
に固定する熱溶着方法において、前記抵抗発熱体に対す
る電圧印加部を２ヶ所となし、この２ヶ所の電圧印加部
から交互に電圧を印加して前記抵抗発熱体を均一に発熱
させてから前記変形部を溶融することを特徴とするもの
である。In order to achieve the above-mentioned object (object), in the invention according to claim 1, in a method for heat-sealing a thermoplastic resin molded article, an AC voltage is applied to a resistance heating element. This resistance heating element is caused to generate heat by applying, and by melting the deformed portion formed in the thermoplastic resin molded product by this heat, in the heat welding method for fixing the fixed object to the thermoplastic resin molded product, The present invention is characterized in that there are two voltage applying portions for the resistance heating element, and voltages are alternately applied from the two voltage applying portions to heat the resistance heating element uniformly and then the deforming portion is melted. It is a thing.

【０００７】更に、請求項２に記載の発明においては、
請求項１記載の熱可塑性樹脂成形品の熱溶着方法におい
て、電圧の印加を切り替える時、次の電圧の印加まで
０．１秒から１．０秒の時間遅れを設定して行うことを
特徴とするものである。Further, in the invention described in claim 2,
The method for heat-sealing a thermoplastic resin molded article according to claim 1, wherein when voltage application is switched, a time delay of 0.1 second to 1.0 second is set until the next voltage application. To do.

【０００８】更に、請求項３に記載の発明においては、
請求項１及び請求項２に記載の電圧の印加により、抵抗
発熱体が溶融温度まで昇温した後、この抵抗発熱体を変
形部に押し当てて溶融することを特徴とするものであ
る。Further, in the invention described in claim 3,
The resistance heating element is heated to the melting temperature by the application of the voltage according to the first and second aspects, and then the resistance heating element is pressed against the deformed portion to be melted.

【０００９】更に、請求項４に記載の発明においては、
抵抗発熱体から後方に向けて等間隔に電極片を４ヶ所形
成し、この電極片において対向する電極片同士を一対と
して電圧印加ブロックＡとＢを形成したこと、前記電圧
印加ブロックＡとＢに対して交互に電圧を印加する通電
切換回路を設けたこと、を特徴とするものである。Further, in the invention described in claim 4,
Four electrode pieces were formed at equal intervals from the resistance heating element toward the rear, and voltage application blocks A and B were formed with the electrode pieces facing each other in the electrode pieces as a pair, and the voltage application blocks A and B were formed. The present invention is characterized in that an energization switching circuit for alternately applying a voltage is provided.

【００１０】[0010]

【作用】請求項１及び４に記載の熱可塑性樹脂成形品の
熱溶着方法及び装置においては、抵抗発熱体に対して２
ヶ所の電圧印加ブロックＡ及びＢを設け、電圧の印加を
ブロックＡとブロックＢに対して交互に行う。このよう
にして電圧の印加を行うと、抵抗発熱体において、電流
の流れる方向が２通り生じる。従って、最高温度部分が
各々異なり、結果として抵抗発熱体全体の温度差が小さ
くなって均一な温度分布を得ることができる。In the method and apparatus for heat-sealing a thermoplastic resin molded article according to claims 1 and 4, the resistance heating element has two parts.
The voltage application blocks A and B are provided at several places, and the voltage is applied to the blocks A and B alternately. When the voltage is applied in this manner, two directions of current flow occur in the resistance heating element. Therefore, the maximum temperature portions are different, and as a result, the temperature difference across the resistance heating element is reduced, and a uniform temperature distribution can be obtained.

【００１１】また、請求項２に記載した熱可塑性樹脂成
形品の熱溶着方法においては、電圧印加ブロックＡと電
圧印加ブロックＢに対して交互に電圧を印加する時に、
次回電圧の印加までの間隔を０．１秒から１．０秒の時
間遅れが発生するように設定した。つまり、電圧印加ブ
ロックＡに電圧を印加している時は、電圧印加ブロック
Ｂは電圧印加停止の状態である。次に、電圧印加ブロッ
クＡは電圧印加停止へ、電圧印加ブロックＢは電圧印加
へと移行するが、電圧印加ブロックＢへの電圧印加を
０．１秒から１．０秒遅らせることにより、この時間遅
れの間に最高温度部から他の部分への熱伝導が行われて
抵抗発熱体において温度分布の均一化を図ることができ
る。Further, in the method for heat-sealing a thermoplastic resin molded article according to claim 2, when voltage is alternately applied to the voltage application block A and the voltage application block B,
The interval until the next voltage application was set so that a time delay of 0.1 seconds to 1.0 seconds occurred. That is, while the voltage is being applied to the voltage application block A, the voltage application block B is in the state where the voltage application is stopped. Next, the voltage application block A shifts to the voltage application stop and the voltage application block B shifts to the voltage application, but by delaying the voltage application to the voltage application block B from 0.1 seconds to 1.0 second, During the delay, heat is conducted from the highest temperature part to other parts, and the temperature distribution in the resistance heating element can be made uniform.

【００１２】次に、電圧印加ブロックＢへの電圧印加時
間が経過した後電圧印加ブロックＡへも同様に時間遅れ
を制御しながら電圧の印加を行う。しかし、間隔が０．
１秒より短い場合、前記したような熱伝導が充分に行わ
れない状態で次の発熱に移ってしまうため温度分布の均
一化が得られない場合がある。また、間隔が１．０秒よ
り長い場合は、抵抗発熱体が温度上昇しても次の電圧印
加までの時間が長いため温度が降下していまい、溶融温
度まで達しない場合がある。これらの現象から、溶着に
際しては、樹脂の種類、変形部の大きさ等により、最適
の遅れ時間に制御される。Next, after the voltage application time to the voltage application block B has elapsed, the voltage is also applied to the voltage application block A while controlling the time delay similarly. However, if the interval is 0.
When the time is shorter than 1 second, the heat generation is shifted to the next heat generation in the state where the heat conduction is not sufficiently performed as described above, so that the uniform temperature distribution may not be obtained. Further, if the interval is longer than 1.0 second, even if the temperature of the resistance heating element rises, the temperature may not drop because the time until the next voltage application is long, and the temperature may not reach the melting temperature. From these phenomena, when welding, the delay time is controlled to be optimum depending on the type of resin, the size of the deformed portion, and the like.

【００１３】さらに、請求項３に記載した熱可塑性樹脂
成形品の熱溶着方法においては、請求項１及び請求項２
記載の電圧印加が終了してから抵抗発熱体を変形部に押
し当てて溶融させるため、温度上昇中に成形品に熱をう
ばわれることなく抵抗発熱体が均一な温度分布になる。
その結果、変形部において熱分解や溶融不充分な部分が
発生することなく均一に溶融して所望する膨大部（熱溶
着）を得ることができる。Furthermore, in the method for heat-welding a thermoplastic resin molded article according to claim 3, the method of claim 1 or 2
Since the resistance heating element is pressed against the deformed portion and melted after the voltage application described above is finished, the resistance heating element has a uniform temperature distribution without heat being applied to the molded product during the temperature rise.
As a result, it is possible to uniformly melt the deformed portion without causing thermal decomposition or insufficient melting, and obtain a desired expanded portion (heat welding).

【００１４】[0014]

【実施例１】請求項１、請求項２、請求項３、請求項４
による熱可塑性樹脂の溶着方法及び装置の実施例につい
て、各図面を参考に説明する。図１は本実施例に用いる
溶融ヘッドの分解斜視図、図２は溶融ヘッドの主要部品
である抵抗発熱体１０を示すもので、（Ａ）は正面図、
（Ｂ）は背面図、図３は溶融ヘッドの要部組立図、図４
は溶融ヘッド１の完成図、図５は図４におけるＡ−Ａ部
断面図である。[Embodiment 1] Claims 1, 2, 3, 4
An embodiment of the method and apparatus for welding a thermoplastic resin according to the above will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a melting head used in this embodiment, FIG. 2 shows a resistance heating element 10 which is a main part of the melting head, and (A) is a front view.
4B is a rear view, FIG. 3 is an assembly view of a main part of the melting head, and FIG.
Is a completed view of the melting head 1, and FIG. 5 is a sectional view taken along line AA in FIG.

【００１５】本発明に用いる溶融ヘッド１は、熱可塑性
樹脂成形品の溶着ボス（変形部）を２カ所同時に加熱溶
融する時に用いるものである。図１において溶融ヘッド
１の要部部品である抵抗発熱体１０について詳細に説明
すると、材料はステンレスを用い、発熱部１１のみ肉厚
は０．３ｍｍ、他の部分は発熱が不要であるため肉厚は
０．６mmである。形状は図２の正面図である（Ａ）に示
す様に長方形から成り、この抵抗発熱体１０の発熱部１
１には間隔をあけて２カ所に半円形状の窪みを有する溶
着チップ１２が形成されている。抵抗発熱体１０の背面
は図２の（Ｂ）に示す様に抵抗発熱体１０の外周が後方
に９０°折り曲げてあり、この折り曲げた外周はスリッ
ト３０により左右と上下に夫々分割されていて、左右の
ものが電極片２０ａ、２０ｂで、一対の電圧印加ブロッ
クＡを形成し、上下のものが電極片２１ａ、２１ｂで、
一対の電圧印加ブロックＢを形成している。The melting head 1 used in the present invention is used to heat and melt two welding bosses (deformed portions) of a thermoplastic resin molded article at the same time. In FIG. 1, the resistance heating element 10 which is a main part of the melting head 1 will be described in detail. Stainless steel is used as a material, only the heating portion 11 has a wall thickness of 0.3 mm, and the other portions do not require heat generation. The thickness is 0.6 mm. As shown in FIG. 2A, which is a front view, the shape of the resistance heating element 10 is a rectangular shape.
A welding tip 12 having semi-circular depressions is formed at two locations on the substrate 1 at intervals. As shown in FIG. 2B, on the back surface of the resistance heating element 10, the outer circumference of the resistance heating element 10 is bent backward by 90 °, and the bent outer circumference is divided into left and right and up and down by a slit 30, respectively. The left and right ones are electrode pieces 20a and 20b to form a pair of voltage application blocks A, and the upper and lower ones are electrode pieces 21a and 21b.
A pair of voltage application blocks B are formed.

【００１６】上記各電極片２０ａ、２０ｂ、２１ａ、２
１ｂの間に設けたスリット３０は、電流の流れる方向を
規制する目的と後述する冷却用エアーをスリット３０の
開口３０ａから外部へ排出する目的を有する。さらに、
電極片２０a、電極片２０ｂの両端は両側面側に９０°
折り曲げることにより、抵抗発熱体１０の強度確保を図
っている。The above-mentioned electrode pieces 20a, 20b, 21a, 2
The slit 30 provided between the slits 1b has the purpose of regulating the direction of current flow and the purpose of discharging cooling air, which will be described later, from the opening 30a of the slit 30 to the outside. further,
Both ends of the electrode piece 20a and the electrode piece 20b are 90 ° on both side surfaces.
The strength of the resistance heating element 10 is ensured by bending.

【００１７】符号４０は、セラミック製の支持部材であ
る絶縁体であり、中心に挿入孔４１が貫通されていると
共に、側面全周に抵抗発熱体１０の肉厚と同様な段差４
２を設けることにより、前方を抵抗発熱体１０の内部に
段差４２まで挿入して位置決めとして、組立を容易にし
ている。符号５０、５１、５２、５３は電極片２０ａ、
２０ｂ、及び電極片２１ａ、２１ｂに夫々取り付けられ
る電圧印加用の電線であり、符号の６０は絶縁体４０の
貫通孔４１へ挿入する冷却用エアー導入パイプである。Reference numeral 40 denotes an insulator, which is a ceramic support member, has an insertion hole 41 formed at the center thereof, and has a step 4 similar to the thickness of the resistance heating element 10 over the entire side surface.
The provision of 2 facilitates assembly by inserting the front into the resistance heating element 10 up to the step 42 for positioning. Reference numerals 50, 51, 52 and 53 are electrode pieces 20a,
20b and electric wires for voltage application attached to the electrode pieces 21a and 21b, respectively, reference numeral 60 denotes a cooling air introduction pipe inserted into the through hole 41 of the insulator 40.

【００１８】図３、図４に基づいて溶融ヘッド１の組立
方法の一例を説明する。先ず電極片２０ａ、２０ｂに対
して電線５０、５１を、電極片２１ａ、２１ｂに対して
電線５２、５３をそれぞれ溶接などにより電気的に接続
する。次に絶縁体４０を抵抗発熱体１０の背面に段差４
２まで挿入して取り付けた後、パイプ６０を絶縁体４０
の貫通孔４１内に挿入する。なお、この組立順序は上記
にこだわらず任意である。その後、図４に示す様に、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７０により、抵抗発熱体１０の一部、絶縁体４０、
パイプ６０、及び各電線５０、５１，５２，５３の一部
を被覆固定して本実施例の溶融ヘッド１を完成する。こ
の完成時に、抵抗発熱体１０のスリット３０の奥側には
開口３０ａが形成されており、パイプ６０から抵抗発熱
体１０の内部に吹き付けられた冷却用エアー９０をこの
開口３０ａから外部へ逃がすことが可能である。図５
は、上記のようにして組み立てを完了した熱溶着ヘッド
１を図４において、Ａ−Ａ部で断面とした状態である。An example of an assembling method of the melting head 1 will be described with reference to FIGS. First, the electric wires 50 and 51 are electrically connected to the electrode pieces 20a and 20b, and the electric wires 52 and 53 are electrically connected to the electrode pieces 21a and 21b by welding or the like. Next, the insulator 40 is formed on the back surface of the resistance heating element 10 by the step 4
After inserting up to 2 and attaching, pipe 60 to insulator 40
It is inserted into the through hole 41. The order of assembling is not limited to the above and is arbitrary. After that, as shown in FIG. 4, a part of the resistance heating element 10, the insulator 40, is covered with a cover 70 made of a heat-resistant resin (for example, epoxy resin containing metal powder).
The pipe 60 and a part of each of the electric wires 50, 51, 52, 53 are covered and fixed to complete the melting head 1 of this embodiment. At the time of this completion, an opening 30a is formed on the back side of the slit 30 of the resistance heating element 10, and the cooling air 90 blown from the pipe 60 into the resistance heating element 10 is allowed to escape to the outside from this opening 30a. Is possible. Figure 5
4 is a state in which the thermal welding head 1 completed assembling as described above is taken along the line AA in FIG.

【００１９】次に、以上説明した溶融ヘッド１を用いて
行う熱可塑性樹脂成形品の熱溶着方法を図６〜図１０を
基に説明する。図６は溶融ヘッド１と溶着電源装置２と
の接続図、図７は溶融ヘッド１への電圧印加タイムチャ
ート、図８は溶融ヘッド１の抵抗発熱体１０を発熱さ
せ、プラスチック基板８０に一体成形された溶着ボス８
１の変形部８２へ当接する直前の断面図、図９は溶融ヘ
ッド１を変形部８２に当接させ溶融後冷却している様子
を示す断面図、図１０は熱溶着が終了した状態の断面図
である。Next, a method for heat-sealing a thermoplastic resin molded product using the above-described melting head 1 will be described with reference to FIGS. FIG. 6 is a connection diagram of the melting head 1 and the welding power source device 2, FIG. 7 is a time chart of voltage application to the melting head 1, and FIG. 8 is an integrally molded plastic substrate 80 by heating the resistance heating element 10 of the melting head 1. Welded boss 8
1 is a cross-sectional view immediately before contacting the deformed portion 82, FIG. 9 is a cross-sectional view showing a state in which the melting head 1 is contacted with the deformed portion 82 and is being cooled after melting, and FIG. It is a figure.

【００２０】先ず、図６により溶着電源装置２の説明と
溶融ヘッド１の接続について説明する。溶着電源装置２
は、ＯＮ−ＯＦＦスイッチ２ａ、トランス２ｂ、制御回
路２ｃ、通電切換回路２ｄ、電磁弁２ｅからなり、ＯＮ
−ＯＦＦスイッチ２ａと通電切換回路２ｄと電磁弁２ｅ
とは制御回路２ｃの信号により動作が制御される。First, the welding power source device 2 and the connection of the melting head 1 will be described with reference to FIG. Welding power supply 2
Is an ON-OFF switch 2a, a transformer 2b, a control circuit 2c, an energization switching circuit 2d, and a solenoid valve 2e.
-OFF switch 2a, energization switching circuit 2d, solenoid valve 2e
The operation is controlled by a signal from the control circuit 2c.

【００２１】通電切換回路２ｄの接続について説明する
と、２回路を有し、ＳＷ１及びＳＷ２の共通端子ＳＷ１
−１、ＳＷ２−１へはトランス２ｂの二次側を接続し、
ＳＷ１の出力側には電線５１、５２を夫々接続し、ＳＷ
２の出力側には電線５０、５３を接続した。この接続状
況をまとめると次のとおりである。 電圧印加ブロックＡ 電線５０ → ＳＷ２−２ 電線５１ → ＳＷ１−
２ 電圧印加ブロックＢ 電線５２ → ＳＷ１−３ 電線５３ → ＳＷ２−
３ つまり、トランス２ｂの二次側からの通電を通電切換回
路２ｄにより電圧印加ブロックＡまたは電圧印加ブロッ
クＢ側に切り換え可能にした。Explaining the connection of the energization switching circuit 2d, it has two circuits and has a common terminal SW1 for SW1 and SW2.
-1, connect the secondary side of the transformer 2b to SW2-1,
Connect wires 51 and 52 to the output side of SW1,
The electric wires 50 and 53 were connected to the output side of 2. The connection status is summarized as follows. Voltage application block A Electric wire 50 → SW2-2 Electric wire 51 → SW1-
2 Voltage application block B Electric wire 52 → SW1-3 Electric wire 53 → SW2-
3 That is, the energization from the secondary side of the transformer 2b can be switched to the voltage application block A or the voltage application block B side by the energization switching circuit 2d.

【００２２】制御回路２ｃへは、あらかじめ図７に示す
ようなタイムチャートを設定しておく。つまり、各電圧
印加ブロックＡ、Ｂに１秒間の電圧印加を３回に分けて
行うが（電圧印加時間を長くすると急激に樹脂の熱分解
温度まで達してしまう理由により）、１秒間の電圧印加
時間経過後他方のブロックに電圧を印加する時、０．３
秒の遅れを置いてから電圧印加を行うこととした。以
上、準備設定後熱溶着を行う。A time chart as shown in FIG. 7 is set in advance in the control circuit 2c. That is, the voltage application for 1 second is applied to each of the voltage application blocks A and B in three steps (because the thermal decomposition temperature of the resin is rapidly reached when the voltage application time is lengthened). When a voltage is applied to the other block after a lapse of time, 0.3
It was decided to apply the voltage after a delay of two seconds. As described above, heat welding is performed after the preparatory setting.

【００２３】先ず、図８について説明すると、熱可塑性
樹脂であるポリカーボネート（ＰＣ）樹脂で成形された
プラスチック基板８０に一体成形された２つの溶着ボス
８１を被固定物８５の貫通された固定孔８６に挿通さ
せ、溶着ボス８１の先端側である変形部８２を被固定物
８５の表面から突き出させる。次に溶着電源装置２の制
御回路２ｃへＯＮ信号を入力すると図７のタイムチャー
トに基づいて通電切換回路２ｄにより電圧印加ブロック
Ａと電圧印加ブロックＢへ交互に電圧が印加される。こ
の印加により抵抗発熱体１０の発熱部１１が発熱し、交
互に切り替えて電圧を印加する効果、さらに、切り替え
時に時間の遅れを設定した効果により、発熱部１１は均
等な温度に昇温して２つの溶着チップ１２は同一温度で
樹脂の溶融温度に達する。First, referring to FIG. 8, two welding bosses 81 integrally molded on a plastic substrate 80 molded of a polycarbonate (PC) resin which is a thermoplastic resin are fixed holes 86 through which the object 85 is penetrated. The deformable portion 82, which is the tip side of the welding boss 81, is projected from the surface of the fixed object 85. Next, when an ON signal is input to the control circuit 2c of the welding power supply device 2, the energization switching circuit 2d alternately applies a voltage to the voltage application block A and the voltage application block B based on the time chart of FIG. Due to this application, the heating portion 11 of the resistance heating element 10 generates heat, and the heating portion 11 is heated to a uniform temperature due to the effect of alternately switching and applying the voltage and the effect of setting a time delay at the switching. The two welding tips 12 reach the melting temperature of the resin at the same temperature.

【００２４】電圧印加時間経過直後図９に示す様に溶融
ヘッド１を溶着ボス８１の変形部８２へ当接させると、
変形部８２が溶着チップ１２の熱で溶融し、溶着チップ
１２内が溶融樹脂で充満する。次に溶融電源装置２内の
電磁弁２ｅが開き冷却エアー９０がパイプ６０を通って
抵抗発熱体１０の内部（裏側）に吹き付けられる。この
結果、抵抗発熱体１０は急激に冷却され、溶融した変形
部８２の樹脂が固化して固定孔８６の径より大きい径を
持つ膨大部８３が形成される。その結果、図１０の様に
プラスチック基板８０と被固定物８５は溶着（固定）さ
れる。なお、抵抗発熱体１０に吹き付けられた冷却用エ
アー９０は開口３０ａを通って外部に排出されるため効
率の良い冷却を行う事ができる。以上の溶着方法によっ
て２つの溶着部は、適温である溶融温度で溶融し、さら
に、固化した膨大部８３を形成したため、溶着強度及び
外観的にも優れた溶着形状が得られた。Immediately after the voltage application time has elapsed, when the melting head 1 is brought into contact with the deformed portion 82 of the welding boss 81 as shown in FIG.
The deformed portion 82 is melted by the heat of the welding tip 12, and the inside of the welding tip 12 is filled with the molten resin. Next, the electromagnetic valve 2e in the melting power supply device 2 is opened, and the cooling air 90 is blown through the pipe 60 to the inside (back side) of the resistance heating element 10. As a result, the resistance heating element 10 is rapidly cooled, the molten resin of the deformed portion 82 is solidified, and the enlarged portion 83 having a diameter larger than the diameter of the fixing hole 86 is formed. As a result, the plastic substrate 80 and the object to be fixed 85 are welded (fixed) as shown in FIG. Since the cooling air 90 blown onto the resistance heating element 10 is discharged to the outside through the opening 30a, efficient cooling can be performed. By the above welding method, the two welded portions were melted at the appropriate melting temperature, and further the solidified enlarging portion 83 was formed, so that a welded shape excellent in weld strength and appearance was obtained.

【００２５】本実施例における発熱部１１の温度分布を
測定したが、高温部と低温部の温度差は８℃であった。
なお、本実施例では、電圧印加ブロックＡ、電圧印加ブ
ロックＢへの電圧印加切換を通電切換回路２ｄでおこな
ったが、各ブロック用トランスを２個用い、一次側を切
り替えて行う方法でも同様な効果を得ることができる。When the temperature distribution of the heat generating part 11 in this example was measured, the temperature difference between the high temperature part and the low temperature part was 8 ° C.
In this embodiment, the switching of the voltage application to the voltage application block A and the voltage application block B is performed by the energization switching circuit 2d, but the same method can be applied by using two transformers for each block and switching the primary side. The effect can be obtained.

【００２６】[0026]

【比較例１】実施例１と同じ溶融ヘッドを用い、従来の
様に通電を電線５０と電線５１との間に下記条件にて通
電を行った。 一次通電 1.0秒 → 通電停止 0.3秒 → 二次通電 1.0秒
→ 通電停止 1.0秒 →三次通電 1.0秒 → 終了 他は実施例１と同じ方法で行い、温度分布を測定すると
高温部と低温部の温度差は７０℃であった。この時の溶
着結果は、一方の溶着部の溶融が不完全であったり、逆
に熱分解している現象が見られた。COMPARATIVE EXAMPLE 1 Using the same melting head as in Example 1, electricity was applied between the electric wire 50 and the electric wire 51 under the following conditions as in the prior art. Primary energization 1.0 s → De-energization 0.3 s → Secondary energization 1.0 s → De-energization 1.0 s → Tertiary energization 1.0 s → Termination Others were carried out in the same manner as in Example 1 and the temperature distribution was measured. The difference was 70 ° C. In the welding result at this time, there was a phenomenon in which the melting of one welded portion was incomplete, or conversely, it was thermally decomposed.

【００２７】[0027]

【比較例２】比較例として、電圧印加を切り替える時、
次回電圧印加までの時間遅れを０．０９秒、０．０８
秒、０．０７秒と短くし、他の条件は実施例１と全く同
様にして、熱溶着を行った。その結果を表１にまとめ
た。Comparative Example 2 As a comparative example, when switching the voltage application,
Time delay until the next voltage application is 0.09 seconds, 0.08
Seconds and 0.07 seconds, and other conditions were exactly the same as in Example 1, and heat welding was performed. The results are summarized in Table 1.

【表１】 つまり、時間遅れが短いため、無発熱状態中に最高温度
部から他の部分への熱伝導が十分に伝わらず温度分布の
均一化を図ることができなかった。したがって、双方の
溶着チップの温度がばらつき、良い溶着状態が得られな
かった。[Table 1] That is, since the time delay is short, heat conduction from the maximum temperature portion to other portions is not sufficiently transmitted during the non-heat generating state, and it is not possible to achieve uniform temperature distribution. Therefore, the temperatures of both welding tips were varied, and a good welding state could not be obtained.

【００２８】[0028]

【比較例３】比較例として、電圧印加を切り替える時、
次回電圧印加までの時間遅れを１．１秒、１．２秒、
１．３秒と長くし、他の条件は実施例１と全く同様にし
て、熱溶着を行った。その結果を表２にまとめた。Comparative Example 3 As a comparative example, when switching the voltage application,
The time delay until the next voltage application is 1.1 seconds, 1.2 seconds,
Thermal welding was performed under the same conditions as in Example 1 except that the time was set to 1.3 seconds. The results are summarized in Table 2.

【表２】 つまり、時間遅れが長いため、せっかく抵抗発熱体１０
の温度が上昇しても次の加熱時間まで長いため冷却され
てしまい、樹脂の溶融温度まで上昇する事が出来なかっ
た。その結果、良い溶着状態が得られなかった。[Table 2] In other words, since the time delay is long, the resistance heating element 10
Even if the temperature of the resin rises, the resin is cooled because the heating time is long until the next heating time, and the melting temperature of the resin cannot be raised. As a result, a good welded state was not obtained.

【００２９】[0029]

【発明の効果】以上説明した様に、本発明である熱可塑
性樹脂成形品の熱溶着方法及びその装置は、 ・発熱体へ電圧印加する箇所を２ブロックに分け、交互
に電圧印加を行う、 ・電圧印加を切り替える時、他ブロックへの電圧印加開
始へ時間的遅れを設ける、 ・発熱体への電圧印加が終了してから、発熱体を溶着ボ
スの変形部へ押し当て溶融させる、 との特徴により、次の様な効果を得ることができる。 ａ．電圧印加場所を切り替えるため、抵抗発熱体の温度
分布を均一にできる。 ｂ．次の電圧印加まで通電停止時間を設けたことによ
り、全体に熱伝導が行われ、その結果抵抗発熱体の温度
分布をさらに均一化できる。 ｃ．抵抗発熱体の温度が一定になってから溶着ボスに当
接させるので、熱分解温度にさらされる危険性がない。 以上の効果から、発熱体の面積が広くても発熱温度分布
が均一になり、しかも、熱溶着精度が良好なことから、
かしめ強度が十分で、かしめ部（膨大部）の外観が良好
な熱溶着成形品を得ることができる。As described above, the method for heat-sealing a thermoplastic resin molded article and the apparatus therefor according to the present invention are as follows: The portion to which a voltage is applied to the heating element is divided into two blocks, and the voltage is alternately applied.・ When switching the voltage application, provide a time delay to the start of voltage application to other blocks. ・ After the voltage application to the heating element is finished, press the heating element against the deformed part of the welding boss to melt. Depending on the characteristics, the following effects can be obtained. a. Since the voltage application location is switched, the temperature distribution of the resistance heating element can be made uniform. b. By providing the energization stop time until the next voltage application, heat conduction is performed throughout, and as a result, the temperature distribution of the resistance heating element can be made more uniform. c. Since the resistance heating element is brought into contact with the welding boss after the temperature becomes constant, there is no risk of exposure to the thermal decomposition temperature. From the above effect, even if the area of the heating element is large, the heat generation temperature distribution becomes uniform, and moreover, the heat welding accuracy is good,
It is possible to obtain a heat-welded molded article having a sufficient caulking strength and a good caulking portion (bulged portion) appearance.

【図面の簡単な説明】[Brief description of drawings]

【図１】実施例１に用いた溶融ヘッドの分解斜視図。FIG. 1 is an exploded perspective view of a melting head used in a first embodiment.

【図２】（Ａ）は抵抗発熱体の正面図、（Ｂ）は背面
図。FIG. 2A is a front view of a resistance heating element, and FIG.

【図３】溶融ヘッドの要部組立図。FIG. 3 is an assembly view of a main part of a melting head.

【図４】溶融ヘッドの完成図。FIG. 4 is a completed view of a melting head.

【図５】図４におけるＡ−Ａ部断面図。5 is a cross-sectional view taken along the line AA in FIG.

【図６】溶融ヘッドと溶着電源装置との接続図。FIG. 6 is a connection diagram of a melting head and a welding power source device.

【図７】溶融ヘッドへの電圧印加タイムチャート。FIG. 7 is a time chart of voltage application to the melting head.

【図８】溶融ヘッドを発熱させ、溶着ボスへ当接させる
直前の断面図。FIG. 8 is a cross-sectional view immediately before heating the melting head to bring it into contact with the welding boss.

【図９】溶融ヘッドを変形部へ押しつけ、溶融後冷却さ
せている様子を示す断面図。FIG. 9 is a cross-sectional view showing a state in which a melting head is pressed against a deformed portion and is cooled after melting.

【図１０】熱溶着が完了した成形品と被固定物の様子を
示す断面図。FIG. 10 is a cross-sectional view showing a state of a molded product and a fixed object that have been heat-welded.

【符号の説明】[Explanation of symbols]

１ 溶融ヘッド ２ 溶着電源装置 １０ 抵抗発熱体 １１ 発熱部 １２ 溶着チップ ２０ａ、２０ｂ 電極片 ２１ａ、２１ｂ 電極片 ３０ スリット ３０ａ 開口 ５０，５１，５２，５３ 電線 ８０ プラスチック基板 ８１ 溶着ボス ８５ 被固定物 1 melting head 2 welding power supply 10 Resistance heating element 11 Heat generating part 12 Welding tip 20a, 20b electrode piece 21a, 21b Electrode piece 30 slits 30a opening 50,51,52,53 electric wire 80 plastic substrates 81 welding boss 85 Fixed object

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】抵抗発熱体に対して交流電圧を印加するこ
とによりこの抵抗発熱体を発熱させ、この熱で熱可塑性
樹脂成形品に形成した変形部を溶融することにより、被
固定物を前記熱可塑性樹脂成形品に固定する熱溶着方法
において、前記抵抗発熱体に対する電圧印加部を２ヶ所
となし、この２ヶ所の電圧印加部から交互に電圧を印加
して前記抵抗発熱体を均一に発熱させてから前記変形部
を溶融する熱可塑性樹脂成形品の熱溶着方法。1. A resistance heating element is heated by applying an AC voltage to the resistance heating element, and the deformed portion formed on the thermoplastic resin molded product is melted by this heat to fix the object to be fixed. In the heat welding method for fixing to a thermoplastic resin molded product, the resistance heating element is provided with two voltage applying portions, and voltage is alternately applied from the two voltage applying portions to uniformly heat the resistance heating element. A method for heat-welding a thermoplastic resin molded article, comprising the step of melting the deformed portion. 【請求項２】電圧の印加を切り替える時、次の電圧の印
加まで０．１秒から１．０秒の時間遅れを設定して行う
請求項１記載の熱可塑性樹脂成形品の熱溶着方法。2. The method for heat welding a thermoplastic resin molded article according to claim 1, wherein when the voltage application is switched, a time delay of 0.1 second to 1.0 second is set until the next voltage application. 【請求項３】電圧の印加により、抵抗発熱体が溶融温度
まで昇温した後、この抵抗発熱体を変形部に押し当てて
溶融する請求項１及び請求項２に記載の熱可塑性樹脂成
形品の熱溶着方法。3. The thermoplastic resin molded article according to claim 1, wherein the resistance heating element is heated to a melting temperature by applying a voltage, and then the resistance heating element is pressed against the deformed portion to be melted. Heat welding method. 【請求項４】抵抗発熱体から後方に向けて等間隔に電極
片を４ヶ所形成し、この電極片において対向する電極片
同士を一対として電圧印加ブロックＡとＢを形成したこ
と、前記電圧印加ブロックＡとＢに対して交互に電圧を
印加する通電切換回路を設けたこと、を特徴とする熱可
塑性樹脂成形品の熱融着装置。4. A voltage application block A and B are formed by forming four electrode pieces at equal intervals from the resistance heating element toward the rear and forming a pair of electrode pieces facing each other in this electrode piece. A heat fusion device for a thermoplastic resin molded article, comprising an energization switching circuit for alternately applying a voltage to blocks A and B.
JP2001379679A 2001-12-13 2001-12-13 Thermal welding method and apparatus for thermoplastic resin molded product Expired - Fee Related JP3737966B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007253481A (en) * 2006-03-23 2007-10-04 Nippon Avionics Co Ltd Multi-point heater chip
JP2007307812A (en) * 2006-05-19 2007-11-29 Fujikura Ltd Impulse welding machine and method therefor
JP2016141101A (en) * 2015-02-04 2016-08-08 ムネカタインダストリアルマシナリー株式会社 Heat welding device
US9726654B2 (en) 2014-03-14 2017-08-08 Ricoh Company, Ltd. Atmosphere sensor and method of producing the same, and method of producing printed matter
JP2019098599A (en) * 2017-11-30 2019-06-24 ムネカタインダストリアルマシナリー株式会社 Resistive heating element for welding equipment
WO2021040548A1 (en) * 2019-08-23 2021-03-04 Jablonowski Adam Sebastian Resistance welding device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007253481A (en) * 2006-03-23 2007-10-04 Nippon Avionics Co Ltd Multi-point heater chip
JP4636615B2 (en) * 2006-03-23 2011-02-23 日本アビオニクス株式会社 Multi-point heater chip
JP2007307812A (en) * 2006-05-19 2007-11-29 Fujikura Ltd Impulse welding machine and method therefor
US9726654B2 (en) 2014-03-14 2017-08-08 Ricoh Company, Ltd. Atmosphere sensor and method of producing the same, and method of producing printed matter
JP2016141101A (en) * 2015-02-04 2016-08-08 ムネカタインダストリアルマシナリー株式会社 Heat welding device
JP2019098599A (en) * 2017-11-30 2019-06-24 ムネカタインダストリアルマシナリー株式会社 Resistive heating element for welding equipment
JP7066164B2 (en) 2017-11-30 2022-05-13 ムネカタインダストリアルマシナリー株式会社 Heat welding device
WO2021040548A1 (en) * 2019-08-23 2021-03-04 Jablonowski Adam Sebastian Resistance welding device

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