JP4587575B2 - Bonding inspection method - Google Patents

Bonding inspection method Download PDF

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JP4587575B2
JP4587575B2 JP2001020913A JP2001020913A JP4587575B2 JP 4587575 B2 JP4587575 B2 JP 4587575B2 JP 2001020913 A JP2001020913 A JP 2001020913A JP 2001020913 A JP2001020913 A JP 2001020913A JP 4587575 B2 JP4587575 B2 JP 4587575B2
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members
resin
sheet
laser light
inspection method
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JP2002225140A (en
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義明 中川
政弘 橋口
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/91221—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 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B29C66/652—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool moving the welding tool around the fixed article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81455—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic 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
    • B29C66/90—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
    • B29C66/91218—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 using colour change, e.g. using separate colour indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3008—Instrument panels

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

Abstract

PROBLEM TO BE SOLVED: To easily inspect the acceptability of a joint achieved between two members joined together using laser rays. SOLUTION: A resin member (an instrument panel) 3 showing a high laser rays absorbance and a resin member (a tact) 4 showing a high laser rays transmittance are joined together in succession while a laser head 5 is moved. Next, when the resin members 3 and 4 are heated by the laser rays, the heat is conducted to a temperature-sensitive sheet 2 under the resin members 3 and 4, which in turn becomes discolored along the moving scan track of the laser rays. Further, it is inspected whether there is a cut spot in the discolored part of the spot to be discolored remains colored and it is judged whether the joint is acceptable according to the results of the inspection.

Description

【０００１】
【発明の属する技術分野】
本発明はレーザ光を利用して２つの部材を接合した場合に、当該部材同士が接合されたか否かを検査する方法に関する。
【０００２】
【従来の技術】
レーザ光を透過する（透過率が高い）樹脂とレーザ光を吸収する（吸収率が高い）樹脂とを重ね、レーザ光を透過する樹脂の側から樹脂を重ねた部分にレーザ光を照射し、レーザ光を吸収する樹脂の一部を溶融せしめることで、樹脂部材同士を接合する方法を本出願人は提案した（特公平５−４２３３６号公報）。また、同公報では、樹脂部材を加熱する代わりに樹脂部材間に介在せしめた接着剤をレーザ光で加熱することで樹脂部材同士を接合する方法も提案した。
【０００３】
【発明が解決しようとする課題】
上記方法によれば、複雑形状の樹脂部品或いは接合個所が極めて狭い樹脂部品同士の接合であっても、容易に行うことができる。
しかしながら、樹脂部品の全数について樹脂部品同士が接合したか否かを検査するのは、現実問題として極めて困難であり、抜き取りの破壊検査を行っている。
抜き取りの破壊検査を行う場合、検査対象となる樹脂部品は破壊されることになるので、その分コストアップにつながる。また、全数検査対象としないため信頼性の面でも問題がある。
【０００４】
【課題を解決するための手段】
上記課題を解決するため、本発明に係る接合検査方法は、互いに重ね合わせた２つの部材のうちの一方の部材側からレーザ光を照射し、当該一方の部材を透過したレーザ光を他方の部材又は接着剤に吸収せしめ、レーザ光を吸収した他方の部材又は接着剤を加熱せしめて接合することを前提としたものである。具体的には感温性シートの上に２つの部材を重ねてセットし、レーザ溶接後に当該感温性シートの変色によって接合されているか否かを判断する。
互いに接合される部材としては樹脂部材に限らず、レーザ光を透過するガラスなども考えられる。
【０００５】
上記の構成とすることで、接合後に部材を払い出すと下に残った感温性シートの熱を受けた部分が変色している。この変色した部分の長さ、形状により２つの部材が確実に接合されているか否かを判断することができる。
【０００６】
感温性シートとしては、例えばベース材料にポリエチレン、ポリプロピレン、ポリ塩化ビニル、エラストマー若しくはゴムを使用し、このベース材料に感温性塗料を混ぜたものを用いる。また、感温性シートとして可逆反応性を呈するものを選定することで、繰り返し使用することができるので好ましい。
【０００７】
また、感温性シートとしては変色点が３５℃〜４５℃の範囲にあるものを選定することが好ましい。変色点が３５℃未満ではレーザ光以外の環境温度の変化によって簡単に変色してしまい、また変色点が４５℃を超えると、十分な接合がなされているにも拘わらず変色しないことになる。
【０００８】
また、レーザ溶接を行うに当たって２つの部材同士を固定しておく手段は任意であるが、２つの部材をレーザ光透過性を有するシートで覆い、シートと部材との間の空気を抜くことで２つの部材を固定する手段を採用すれば、固定治具が不要となるので、レーザ光を照射するレーザヘッドが移動する際に固定治具に干渉することを防げる。
【０００９】
【発明の実施の形態】
以下に本発明の実施の形態を添付図面に基づいて説明する。図１は受け冶具に感温性シートをセットする状態を示す斜視図、図２は感温性シートの上に２つの部材をセットする状態を示す斜視図、図３は２つの部材をレーザ溶接している状態を示す図、図４はレーザ溶接後の感温性シートの平面図である。
【００１０】
先ず、２つの部材の接合手順を説明すると、図１に示すように、受け台1上に感温性シート２をセットする。感温性シート２の大きさは受け台1の上面全面を覆う大きさでもよいが、レーザ光の走査範囲をカバーできる大きさであればよい。
【００１１】
次いで図２に示すように、感温性シート２上に樹脂部材であるインストルメントパネル３とダクト４を重ねてセットする。本実施例の場合、インストルメントパネル３はレーザ光の吸収率が高い材料からなり、ダクト４はレーザ光の透過率が高い材料からなる。
【００１２】
この後図３に示すように、レーザヘッド５から接合部に向けてレーザ光（ＹＡＧ）を照射する。
すると、ダクト４はレーザ光を透過するため、照射されたレーザ光の殆どがインストルメントパネル３に到達し、インストルメントパネル３に吸収され発熱し、この熱によってインストルメントパネル３とダクト４の一部が溶融し、インストルメントパネル３とダクト４とが接合される。
【００１３】
尚、インストルメントパネル３とダクト４との間にレーザ光を吸収して溶融する接着剤を介在せしめてもよい。このようにすると、インストルメントパネル３がレーザ光を吸収しない材料であっても接合できる。
【００１４】
前記レーザヘッド５はＮＣ制御により３次元空間で任意の位置に移動可能とされ、移動しつつ連続して樹脂部材同士を接合する。そして、レーザ光によってインストルメントパネル３が加熱せしめられるとその熱はその下の感温性シート２にも伝わり、レーザ光の移動軌跡に沿って変色する。この変色は図４に示すように、接合後に樹脂部材を受け治具1から取り除いた際に目視により確認できる。そこで、変色した部分に切断された個所がないか、変色すべき個所が変色していないか否か等を検査して接合の適、不適を判断する。
【００１５】
ところで、２つの樹脂部材をレーザ溶接する場合には、何らかの手段によって樹脂部材同士を固定しておく必要がある。一般的な固定治具を用いると、当該固定治具にレーザヘッド５が干渉するおそれがある。これを解消するため、図５に示す別実施例が考えられる。
【００１６】
図５に示す別実施例にあっては、インストルメントパネル３とダクト４をレーザ光透過性シート６で覆い、レーザ光透過性シート６と樹脂部材３、４との間の空気を吸引口7から抜くことで樹脂部材３、４を固定し、次いで前記レーザ光透過性シート６側からレーザ光を照射し、レーザ光透過性シート６及びダクト４を透過したレーザ光をインストルメントパネル３で吸収して接合するようにしている。
【００１７】
なお、実施例にあっては接合対象として樹脂部材を示したが、樹脂部材でなくともレーザ光を透過する特性を有する部材であれば本発明を適用できる。
【００１８】
【発明の効果】
以上に説明したように本発明によれば、レーザ光を利用して部材同士を接合する際に、予め部材の下に感温性シートを敷くようにしたので、接合後に部材を払い出すと、その下に残った感温性シートの熱を受けた部分が変色しているので、当該変色した部分の長さ、形状、幅などを調べることで、接合の適、不適を即座に判断することができる。
【００１９】
また、本発明によれば、抜き取りの破壊検査ではなく、全数の非破壊検査であるので、信頼性が向上するとともにコスト的にも有利となる。
更に、感温性シートとして可逆反応性のものを選定すれば、繰り返し使用することができ、また変色点が３５℃〜４５℃のものを選定すれば、環境温度等の影響を受けず且つ正確に検査することができる。
【図面の簡単な説明】
【図１】受け冶具に感温性シートをセットする状態を示す斜視図。
【図２】感温性シートの上に２つの樹脂部材をセットする状態を示す斜視図。
【図３】２つの樹脂部材をレーザ溶接している状態を示す図。
【図４】レーザ溶接後の感温性シートの平面図。
【図５】別実施例を示す図。
【符号の説明】
１…受け台、２…感温性シート、３…インストルメントパネル、４…ダクト、５…レーザヘッド、６…レーザ光透過性シート、７…吸引口。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for inspecting whether or not two members are joined when two members are joined using laser light.
[0002]
[Prior art]
The resin that transmits the laser beam (high transmittance) and the resin that absorbs the laser beam (high absorption rate) are stacked, and the laser beam is irradiated to the portion where the resin is stacked from the side of the resin that transmits the laser beam, The present applicant has proposed a method for joining resin members by melting a part of resin that absorbs laser light (Japanese Patent Publication No. 5-42336). In addition, the publication also proposes a method of joining resin members by heating an adhesive interposed between the resin members with laser light instead of heating the resin members.
[0003]
[Problems to be solved by the invention]
According to the above method, even when resin parts having complicated shapes or resin parts having very narrow joints are joined, they can be easily performed.
However, it is extremely difficult to inspect whether or not the resin parts are bonded with respect to the total number of the resin parts, and a destructive inspection of the sampling is performed.
When performing a destructive inspection for sampling, the resin component to be inspected is destroyed, leading to an increase in cost. In addition, there is a problem in terms of reliability because it is not subject to 100% inspection.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, a bonding inspection method according to the present invention irradiates a laser beam from one member side of two members overlapped with each other, and transmits the laser beam transmitted through the one member to the other member. Alternatively, it is assumed that the other member or adhesive that has absorbed the laser beam and absorbed the laser beam is heated and joined. Specifically, two members are set on top of the temperature sensitive sheet, and it is determined whether or not the two members are joined by laser discoloration after laser welding.
The members to be joined to each other are not limited to resin members, and glass that transmits laser light is also conceivable.
[0005]
By setting it as said structure, when the member is paid out after joining, the part which received the heat | fever of the thermosensitive sheet which remained under has discolored. It is possible to determine whether or not the two members are reliably joined based on the length and shape of the discolored portion.
[0006]
As the temperature-sensitive sheet, for example, polyethylene, polypropylene, polyvinyl chloride, elastomer or rubber is used as a base material and a temperature-sensitive paint is mixed with the base material. In addition, it is preferable to select a thermosensitive sheet that exhibits reversible reactivity because it can be used repeatedly.
[0007]
Moreover, it is preferable to select a thermosensitive sheet having a color change point in the range of 35 ° C to 45 ° C. If the discoloration point is less than 35 ° C., the discoloration is easily caused by a change in environmental temperature other than the laser beam. If the discoloration point exceeds 45 ° C., the discoloration does not occur despite sufficient bonding.
[0008]
In addition, the means for fixing the two members to each other in performing laser welding is arbitrary, but the two members are covered with a sheet having laser light permeability, and the air between the sheet and the member is removed by removing the air. If a means for fixing two members is employed, a fixing jig is not required, and therefore it is possible to prevent the laser head that irradiates the laser light from interfering with the fixing jig when moving.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view showing a state in which a temperature-sensitive sheet is set on a receiving jig, FIG. 2 is a perspective view showing a state in which two members are set on the temperature-sensitive sheet, and FIG. 3 is a laser welding of the two members. FIG. 4 is a plan view of the temperature-sensitive sheet after laser welding.
[0010]
First, a procedure for joining two members will be described. As shown in FIG. 1, a temperature-sensitive sheet 2 is set on a cradle 1. The size of the temperature sensitive sheet 2 may be a size that covers the entire upper surface of the cradle 1, but may be a size that can cover the scanning range of the laser beam.
[0011]
Next, as shown in FIG. 2, the instrument panel 3 and the duct 4 which are resin members are stacked and set on the temperature-sensitive sheet 2. In the case of the present embodiment, the instrument panel 3 is made of a material having a high laser light absorption rate, and the duct 4 is made of a material having a high laser light transmittance.
[0012]
Thereafter, as shown in FIG. 3, laser light (YAG) is irradiated from the laser head 5 toward the joint.
Then, since the duct 4 transmits laser light, most of the irradiated laser light reaches the instrument panel 3 and is absorbed by the instrument panel 3 to generate heat. The part melts, and the instrument panel 3 and the duct 4 are joined.
[0013]
Note that an adhesive that absorbs and melts laser light may be interposed between the instrument panel 3 and the duct 4. If it does in this way, even if the instrument panel 3 is a material which does not absorb a laser beam, it can join.
[0014]
The laser head 5 can be moved to an arbitrary position in a three-dimensional space by NC control, and continuously joins resin members while moving. Then, when the instrument panel 3 is heated by the laser light, the heat is transmitted to the temperature-sensitive sheet 2 below, and the color is changed along the movement locus of the laser light. As shown in FIG. 4, this discoloration can be visually confirmed when the resin member is removed from the jig 1 after joining. Therefore, it is determined whether or not the discolored portion is cut or not, and whether or not the portion to be discolored is discolored is determined as to whether or not joining is appropriate.
[0015]
By the way, when laser welding two resin members, it is necessary to fix the resin members by some means. If a general fixing jig is used, the laser head 5 may interfere with the fixing jig. In order to solve this problem, another embodiment shown in FIG. 5 can be considered.
[0016]
In another embodiment shown in FIG. 5, the instrument panel 3 and the duct 4 are covered with a laser light transmitting sheet 6, and the air between the laser light transmitting sheet 6 and the resin members 3, 4 is sucked into the suction port 7. The resin members 3 and 4 are fixed by pulling them out, and then laser light is irradiated from the laser light transmitting sheet 6 side, and the laser light transmitted through the laser light transmitting sheet 6 and the duct 4 is absorbed by the instrument panel 3. And are trying to join.
[0017]
In the embodiment, a resin member is shown as a bonding target. However, the present invention can be applied to any member that has a characteristic of transmitting laser light instead of a resin member.
[0018]
【The invention's effect】
As explained above, according to the present invention, when joining members using laser light, since a temperature-sensitive sheet is previously laid under the members, when the members are dispensed after joining, The heat-sensitive part of the thermosensitive sheet that remains underneath is discolored. By examining the length, shape, width, etc. of the discolored part, it is possible to immediately determine whether or not the joint is suitable. Can do.
[0019]
In addition, according to the present invention, since it is not a sampling destructive inspection but a total number of nondestructive inspections, the reliability is improved and the cost is advantageous.
Furthermore, if a reversible reactive sheet is selected as the thermosensitive sheet, it can be used repeatedly, and if a sheet having a color change point of 35 ° C. to 45 ° C. is selected, it is not affected by the environmental temperature and is accurate. Can be inspected.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a temperature-sensitive sheet is set on a receiving jig.
FIG. 2 is a perspective view showing a state in which two resin members are set on a temperature-sensitive sheet.
FIG. 3 is a view showing a state in which two resin members are laser-welded.
FIG. 4 is a plan view of a temperature-sensitive sheet after laser welding.
FIG. 5 is a diagram showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Receiving stand, 2 ... Temperature sensitive sheet, 3 ... Instrument panel, 4 ... Duct, 5 ... Laser head, 6 ... Laser-light-permeable sheet, 7 ... Suction port.

Claims (4)

２つの部材を重ね、一方の部材側からレーザ光を照射し、当該一方の部材を透過したレーザ光を他方の部材又は接着剤に吸収せしめ、レーザ光を吸収した他方の部材又は接着剤を加熱せしめて接合する方法を適用した２つの部材が、接合されているか否かを検査する方法であって、この検査方法は感温性シートの上に２つの部材を重ねてセットし、レーザ溶接後に当該感温性シートの変色によって接合されているか否かを判断することを特徴とする接合検査方法。Two members are stacked, laser light is irradiated from one member side, the laser light transmitted through the one member is absorbed by the other member or adhesive, and the other member or adhesive that has absorbed the laser light is heated. It is a method of inspecting whether two members to which the method of joining at least is applied are joined, and this inspection method sets two members on the temperature sensitive sheet, and after laser welding It is judged whether it is joined by discoloration of the said thermosensitive sheet, The joining inspection method characterized by the above-mentioned. 請求項１に記載の接合検査方法において、前記２つの部材のうちの少なくとも一方は樹脂部材であることを特徴とする接合検査方法。The joint inspection method according to claim 1, wherein at least one of the two members is a resin member. 請求項１に記載の接合検査方法において、前記感温性シートは変色点が３５℃〜４５℃の範囲にあることを特徴とする接合検査方法。The bonding inspection method according to claim 1, wherein the thermosensitive sheet has a color change point in a range of 35 ° C. to 45 ° C. 請求項１に記載の樹脂検査方法において、前記２つの部材をレーザ光透過性を有するシートで覆い、シートと樹脂部材との間の空気を抜くことで２つの樹脂部材を固定した状態でレーザ光を接合部に照射することを特徴とする接合検査方法。2. The resin inspection method according to claim 1, wherein the two members are covered with a laser light-transmitting sheet, and the two resin members are fixed by removing air between the sheet and the resin member. A bonding inspection method characterized by irradiating a bonding portion.
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JPH07185849A (en) * 1993-11-30 1995-07-25 Elpatronic Ag Method and laser welding device for effecting process control and/or quality control upon laser butt welding of plate
JPH07186331A (en) * 1993-12-27 1995-07-25 Bridgestone Corp Production of laminate
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