JP2004261986A - Resin component and its laser welding method - Google Patents

Resin component and its laser welding method Download PDF

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Publication number
JP2004261986A
JP2004261986A JP2003052333A JP2003052333A JP2004261986A JP 2004261986 A JP2004261986 A JP 2004261986A JP 2003052333 A JP2003052333 A JP 2003052333A JP 2003052333 A JP2003052333 A JP 2003052333A JP 2004261986 A JP2004261986 A JP 2004261986A
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Prior art keywords
resin
width direction
welding
resin member
laser beam
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JP4003666B2 (en
Inventor
Yuji Sakagami
祐治 阪上
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Nissan Motor Co Ltd
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Nissan 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre 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
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • 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
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/749—Motors
    • B29L2031/7492—Intake manifold

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the occurrence of trouble such as welding failure or the like, which is caused by the moving speed difference of a laser beam between the outside and inside parts of a welding flange, in the corner part of welding margins. <P>SOLUTION: The joining flange part 2a of a halved component 2 absorbing a laser beam 4 and the joining flange part 3a of a halved component 3 permitting the laser beam 4 to transmit are butted mutually and irradiated with the spot-like laser beam 4 to be welded and joined along the joining surfaces 7 of both components. In consideration of a point that the moving speed of the laser beam 4 is high in the outside part C1 in the width direction of each component and relatively low in the inside part C2 in the width direction thereof, the flange surface 3c is inclined so that the wall thickness continuously changes from the outside part C1 in the width direction toward the inside part C2 in the width direction within a wall thickness range of t1-t2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、合成樹脂材料をもって形成された樹脂部品とそのレーザ溶着（レーザ溶接）方法に関し、特に一方の樹脂部材と他方の樹脂部材とをレーザ光照射による溶着をもって接合してなる樹脂部品とそのレーザ溶着方法に関するものである。
【０００２】
【従来の技術】
この種の樹脂部品のレーザ溶着技術として特許文献１に記載のものが知られている。この特許文献１に記載の技術では、レーザ光を透過する樹脂部材とレーザ光を吸収する樹脂部材とを重ね合わせた上でレーザ光を透過する樹脂部材側からレーザ光を照射して、レーザ光を吸収する樹脂部材の一部を溶融せしめるとともに、その溶融熱をもってレーザ光を透過する樹脂部材を溶融させることで双方の樹脂部材同士を溶着接合することを基本としている。
【０００３】
ところで、上記レーザ溶着に代表されるような樹脂部品の溶着接合に際しては、それぞれの樹脂部材の周縁部に溶着代となるべき接合フランジ部を予め形成しておき、これらの接合フランジ部同士を突き合わせるように重ね合わせた上で、レーザ光を照射することになるレーザヘッドを例えばＮＣ制御等にて接合フランジ部に沿って移動させることで連続的に溶着を行うことになる。
【０００４】
【特許文献１】
特公昭６２−４９８５０号公報 （第２頁および第１図）
【０００５】
【発明が解決しようとする課題】
一方の樹脂部材の接合フランジ部にレーザ光をスポット状に照射した上でこれを接合フランジ部の長手方向に沿って移動させる場合、樹脂部材の外周に設定した接合フランジ部が円形であったり、あるいはその接合フランジ部がコーナー部分で所定曲率の曲線をもって屈曲している場合には、微視的に見るとその接合フランジ部の幅方向外側部分と幅方向中央部分および幅方向内側部分ではそれぞれにレーザ光が進む速度が異なってしまうことになる。より詳しくは、本発明の実施の形態で使用している図２を借りて説明すれば、レーザ光４の光軸の移動軌跡となる幅方向中央部分（レーザ光軌跡６と一致する部分）ではそのレーザ光４の移動速度が適正であっても、幅方向外側部分Ｃ１では相対的にレーザ光４の移動速度が速く、また幅方向内側部分Ｃ２では相対的にレーザ光４の移動速度が遅くなることになる。
【０００６】
そのため、接合フランジ部の幅方向内側部分Ｃ２では速度の減少によってエネルギー投与が過剰気味となって樹脂そのものの劣化が発生するほか、接合フランジ部の幅方向外側部分Ｃ１では速度の増加によってエネルギー投与が不足気味となって溶融不足が発生し、いずれも場合にも溶着品質の低下により十分な溶着強度および溶着気密性を確保できないという不具合があった。
【０００７】
本発明はこのような課題に着目してなされたものであり、特に接合フランジ部の幅方向内側部分と外側部分とでレーザ光の速度差があっても、その速度差を許容しつつ溶着品質には影響しないように考慮された樹脂部品とそのレーザ溶着方法を提供するものである。
【０００８】
【課題を解決するための手段】
請求項１に記載の発明は、レーザ光を透過する一方の樹脂部材とレーザ光を吸収する他方の樹脂部材とを溶着をもって接合してなる樹脂部品にして、それぞれの樹脂部材に溶着代として予め形成した接合フランジ部同士を突き合わせた上で、一方の樹脂部材の接合フランジ部側からレーザ光を照射して樹脂部材同士を溶着することにより一体化した樹脂部品であることを前提としている。その上で、溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分の肉厚が幅方向中央部分のそれよりも小さく且つ幅方向内側部分の肉厚が幅方向中央部分のそれよりも大きく設定されていることを特徴とする。
【０００９】
この場合、請求項２に記載のように、溶着代となるべき接合フランジ部が屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分から幅方向内側部分に向かってその肉厚が連続的もしくは段階的に変化しているものとする。
【００１０】
また、請求項３に記載の発明は、請求項１に記載の技術をレーザ溶着方法としてとらえたものであって、レーザ光を透過する一方の樹脂部材とレーザ光を吸収する他方の樹脂部材とを溶着をもって接合してなる樹脂部品にして、それぞれの樹脂部材に溶着代として予め形成した接合フランジ部同士を突き合わせた上で、一方の樹脂部材の接合フランジ部側からレーザ光を照射して接合フランジ部の長手方向に相対移動させることにより樹脂部材同士を溶着して樹脂部品とするレーザ溶着方法であることを前提としている。その上で、溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分の肉厚が幅方向中央部分のそれよりも小さく且つ幅方向内側部分の肉厚が幅方向中央部分のそれよりも大きく設定されていることを特徴とする。
【００１１】
したがって、請求項１〜３に記載の発明では、レーザ光を透過する一方の樹脂部材のうち溶着代となるべき接合フランジ部が円形であったり、あるいはその接合フランジ部がコーナー部分で所定曲率の曲線をもって屈曲している場合に、接合フランジ部の幅方向外側部分では相対的に肉厚が小さいためにその透過率が上がり、レーザ光のエネルギー損失が小さくなる。逆に、接合フランジ部の幅方向内側部分では相対的に肉厚が大きいためにその透過率が下がり、レーザ光のエネルギー損失が大きくなる。
【００１２】
その一方、先に述べたように接合フランジ部のコーナー部分等を移動するレーザ光は、接合フランジ部の幅方向外側部分では相対的にその移動速度が速く、接合フランジ部に与えるレーザエネルギーが不足気味であるのに対して、幅方向内側部分では相対的にその移動速度が遅く、接合フランジ部に与えるレーザエネルギーが過剰気味となっている。
【００１３】
その結果として、上記の肉厚差によるレーザエネルギーの損失と接合フランジ部の内側と外側でのレーザ光の速度差によるレーザエネルギーの過不足が相殺されて、接合フランジ部の内側と外側とでは実際に投与されるレーザエネルギーをほぼ均一なものとすることができる。
【００１４】
【発明の効果】
請求項１〜３に記載の発明によれば、レーザ光が直接照射されることになる接合フランジ部のコーナー部分等において、その幅方向外側部分と内側部分でのレーザ光の速度差の発生が余儀なくされることを前提として、接合フランジ部の幅方向外側部分と内側分とで積極的に肉厚差をもたせたため、接合フランジ部の幅方向外側部分と内側部分では実際に投与されるレーザエネルギーがほぼ均一なものとなり、溶融不足等の不具合の発生が解消されて接合フランジ部での接合強度および気密性が向上する。
【００１５】
【発明の実施の形態】
図１〜３は本発明の好ましい実施の形態を示す図で、樹脂部品として内燃機関における樹脂製のインテークマニホールドを溶着接合する場合の例を示している。
【００１６】
同図に示すように、樹脂部品としてのインテークマニホールド１は全体として略偏平矩形状の管状体構造のものとして形成されていて、全周に接合フランジ部２ａ，３ａが形成された樹脂部材たる二つの半割部品２，３を用意し、それらの半割部品２，３の接合フランジ部２ａ，３ａ同士を突き合わせた上でその部分にレーザ光４による溶着接合を施すことで接合フランジ部２ａ，３ａを溶着代として一体化される。
【００１７】
二つの半割部品２，３のうち一方の半割部品２にはレーザ光４を吸収する特性を、他方の半割部品３にはレーザ光を透過する特性をそれぞれ具備させるべく、一方の半割部品２はレーザ光４を吸収する樹脂材料をもって、他方の半割部品３はレーザ光４を透過する樹脂材料をもってそれぞれ成形してある。例えばそれぞれの半割部品２，３を射出成形するにあたり、一方の半割部品２は樹脂材料としてＰＡ６ＧＦ強化材にレーザ光４を吸収する着色料を混ぜたものを用いて成形し、他方の半割部品３は樹脂材料として同じくＰＡ６ＧＦ強化材にレーザ光４を透過する着色料を混ぜたものを用いて成形してある。
【００１８】
レーザ光４による溶着は、レーザヘッド５により一方の半割部品３側からレーザ光４を照射したならば、そのレーザヘッド５と半割部品２，３とを接合フランジ部２ａ，３ａの幅寸法を二分する中心線すなわちレーザ光軌跡６に沿って相対移動させることで行う。例えば半割部品２，３を固定側としてレーザヘッド５をＮＣ制御等によりレーザ光軌跡６に沿って移動させることで接合フランジ部２ａ，３ａ同士の溶着を行う。すなわち、一方の半割部品３はレーザ光４を透過し、他方の半割部品２はレーザ光４を吸収するが故に、一方の半割部品３の接合フランジ部３ａを透過したレーザ光４は接合面７（接合フランジ部２ａ，３ａ同士の合わせ面）にて他方の半割部品２の接合フランジ部３ａにて吸収され、その接合フランジ部３ａの一部を溶融させる。同時に、その溶融熱を受けて他方の半割部品３の接合フランジ部３ａの一部も溶融し、これにより双方の接合フランジ部２ａ，３ａ同士が溶着接合される。
【００１９】
この場合、図２に拡大して示すように、接合フランジ部２ａ，３ａのコーナー部分Ｃでは所定直径寸法のスポット状のレーザ光４の焦点４ａが所定曲率の円弧状の軌跡を描きながら移動するが故に、その接合フランジ部２ａ，３ａの幅方向中央部分（レーザ光軌跡６と一致している部分）ではレーザ光４の移動速度が適正であっても、その接合フランジ部２ａ，３ａの幅方向外側部分Ｃ１ではレーザ光４の移動速度が大きく、逆に接合フランジ部２ａ，３ａの幅方向内側部分Ｃ２ではレーザ光４の移動速度が小さくなる。このような接合フランジ部２ａ，３ａの幅方向でのレーザ光４の速度差は先に述べたように溶着部に実際に投与されるレーザエネルギーの過不足を生じることになる。
【００２０】
そこで、本実施の形態では、図３に示すようにレーザ光４を透過する樹脂材料をもって形成された一方の半割部品３のうち接合フランジ部３ａのコーナー部分Ｃについて、幅方向外側部分Ｃ１の肉厚が中央部分の肉厚ｔ０よりも小さく且つ幅方向内側部分Ｃ２の肉厚が中央部分の肉厚ｔ０よりも大きくなるように、その接合フランジ部３ａの幅方向外側部分Ｃ１から内側部分Ｃ２に向かってその肉厚寸法がｔ１からｔ２（ｔ１＜ｔ２）なる連続的変化をもって漸次大きくなるように設定してある。より具体的には、接合フランジ部３ａのコーナー部分Ｃについてそのフランジ面３ｃが接合面７と非平行となるような傾斜面とすることで上記のような肉厚変化を具備させてある。
【００２１】
したがって、本実施の形態によれば、レーザ光４を透過する樹脂材料をもって形成された半割部品３のうち溶着代となるべき接合フランジ部３ａのコーナー部分Ｃでは、その幅方向外側部分Ｃ１が内側部分Ｃ２と比べて相対的に肉厚が小さいためにレーザ光４の透過率が上がり、レーザ光４のエネルギー損失が小さくなる。逆に、接合フランジ部３ａの幅方向内側部分Ｃ２では外側部分Ｃ１に比べ相対的に肉厚が大きいためにレーザ光４の透過率が下がり、レーザ光４のエネルギー損失が大きくなる。
【００２２】
その一方で、先に述べたように接合フランジ部３ａのコーナー部分Ｃを移動するレーザ光４は、接合フランジ部３ａの幅方向外側部分Ｃ１では相対的にその移動速度が大きく、接合面７に与えるべきレーザエネルギーが不足気味であるのに対して、接合フランジ部３ａの幅方向内側部分Ｃ２では相対的にその移動速度が小さく、接合面７に与えるべきレーザエネルギーが過剰気味となっている。
【００２３】
その結果、接合フランジ部３ａの幅方向での肉厚差によるレーザエネルギーの損失度合いと接合フランジ部３ａの内側部分Ｃ２と外側部分Ｃ１でのレーザ光の速度差によるレーザエネルギーの過不足とが相殺されて、接合フランジ部３ａの幅方向内側部分Ｃ２と外側部分Ｃ１とでは実際に投与されるレーザエネルギーをほぼ均一なものとすることができる。
【００２４】
これにより、レーザエネルギーの過不足を原因として従来発生していた樹脂の劣化や溶融不足等の不具合の発生を未然に防止して、接合面７たる溶着部での溶着強度や気密性が飛躍的に向上するようになる。
【００２５】
図４〜６は本発明の第２〜４の実施の形態を示す。
【００２６】
図４に示す第２の実施の形態では、図３比較すると明らかなように、レーザ光４を透過する樹脂材料をもって形成された一方の半割部品３のうち接合フランジ部３ａのコーナー部分Ｃについて、その接合フランジ部３ａの幅方向外側部分Ｃ１から内側部分Ｃ２に向かってその肉厚寸法がｔ１〜ｔ２なる連続的変化をもって漸次大きくなるように、その接合面７がフランジ面３ｃと非平行となるような傾斜面としてある。この場合には、もう一方の半割部品２の接合フランジ部２ａも逆勾配の肉厚変化を伴うことになる。
【００２７】
また、図５に示す第３の実施の形態では、レーザ光４を透過する樹脂材料をもって形成された一方の半割部品３のうち接合フランジ部３ａのコーナー部分Ｃについて、その接合フランジ部３ａの幅方向外側部分Ｃ１から内側部分Ｃ２に向かってその肉厚寸法がｔ１〜ｔ２なる段階的変化をもって漸次大きくなるように、そのフランジ面３ｃを階段状のものとして形成してある。
【００２８】
同様に図６に示す第４の実施の形態では、レーザ光４を透過する樹脂材料をもって形成された一方の半割部品３のうち接合フランジ部３ａのコーナー部分Ｃについて、その接合フランジ部３ａの幅方向外側部分Ｃ１から内側部分Ｃ２に向かってその肉厚寸法がｔ１〜ｔ２なる段階的変化をもって漸次大きくなるように、その接合面７を階段状のものとして形成してある。なお、この場合には、もう一方の半割部品２の接合フランジ部２ａも逆勾配の肉厚変化を伴うことになる。
【００２９】
これら第２〜４の実施の形態では、第１の実施の形態と比べた場合に、接合フランジ部３ａの幅方向外側部分Ｃ１から内側部分Ｃ２に向かってその肉厚寸法が漸次大きくなるように設定されていることに変わりはなく、したがって第１の実施の形態と同様の機能が発揮される。
【００３０】
図７は本発明の第５の実施の形態を示し、レーザ光４を透過する樹脂材料をもって形成された一方の半割部品３側からレーザ光４を照射する際に、その接合フランジ部３ａのコーナー部分Ｃでは、レーザ光４の光軸を接合フランジ部３ａの幅方向内側部分Ｃ２側に所定角度θだけ傾けて照射するようにしたものである。
【００３１】
この第５の実施の形態によれば、同図から明らかなように接合フランジ部３ａの幅方向外側部分Ｃ１では内側部分Ｃ２よりもレーザ光４の透過距離Ｌ１が小さくなり（Ｌ１＜Ｌ２）、その分だけレーザ光４のエネルギー損失が小さくなることから、その結果として第１〜４の実施の形態と全く同様の機能が発揮されることになる。
【図面の簡単な説明】
【図１】本発明の好ましい第１の実施の形態としてインテークマニホールドにレーザ溶着を施す際の図で、（Ａ）はその平面説明図、（Ｂ）はその側面説明図、（Ｃ）は同図（Ａ）の右側面説明図。
【図２】図１の（Ａ）のＢ部拡大図。
【図３】図１の（Ａ）のＡ−Ａ線に沿う拡大断面図。
【図４】本発明の第２の実施の形態を示す図で、図３と同等部位の断面図。
【図５】本発明の第３の実施の形態を示す図で、図３と同等部位の拡大断面図。
【図６】本発明の第４の実施の形態を示す図で、図３と同等部位の拡大断面図。
【図７】本発明の第５の実施の形態を示す図で、図３と同等部位の断面図。
【符号の説明】
１…インテークマニホールド（樹脂部品）
２…半割部品（樹脂部材）
２ａ…接合フランジ部
３…半割部品（樹脂部材）
３ａ…接合フランジ部
４…レーザ光
５…レーザヘッド
７…接合面
Ｃ…コーナー部分
Ｃ１…幅方向外側部分
Ｃ２…幅方向内側部分[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin component formed of a synthetic resin material and a laser welding (laser welding) method thereof, and in particular, a resin component formed by joining one resin member and the other resin member by welding by laser light irradiation, and The present invention relates to a laser welding method.
[0002]
[Prior art]
As a laser welding technique for this type of resin component, the one described in Patent Document 1 is known. In the technique described in Patent Document 1, a laser member that transmits a laser beam and a resin member that absorbs the laser beam are superposed on each other and then irradiated with the laser beam from the resin member side that transmits the laser beam. It is based on melting and joining a part of the resin member that absorbs the resin, and melting and bonding the resin member that transmits the laser beam with the heat of fusion.
[0003]
By the way, at the time of welding and joining resin parts as represented by the above laser welding, a joining flange portion to be a welding allowance is formed in advance on the peripheral portion of each resin member, and these joining flange portions are brought into contact with each other. The laser heads that are to be irradiated with laser light are moved along the joint flange portion by NC control or the like, for example, and then welding is continuously performed.
[0004]
[Patent Document 1]
Japanese Examined Patent Publication No. 62-49850 (Page 2 and Fig. 1)
[0005]
[Problems to be solved by the invention]
When irradiating the joint flange part of one resin member in a spot shape with laser light and moving it along the longitudinal direction of the joint flange part, the joint flange part set on the outer periphery of the resin member is circular, Alternatively, when the joint flange portion is bent with a curve of a predetermined curvature at the corner portion, when viewed microscopically, the width direction outer portion, the width direction center portion, and the width direction inner portion of the joint flange portion respectively. The traveling speed of the laser light will be different. More specifically, referring to FIG. 2 used in the embodiment of the present invention, in the central portion in the width direction (the portion that coincides with the laser beam locus 6) that is the movement locus of the optical axis of the laser beam 4, Even if the moving speed of the laser beam 4 is appropriate, the moving speed of the laser beam 4 is relatively high in the width direction outer portion C1, and the moving speed of the laser beam 4 is relatively slow in the width direction inner portion C2. Will be.
[0006]
For this reason, in the widthwise inner portion C2 of the joining flange portion, energy administration becomes excessive due to a decrease in speed, and the resin itself deteriorates, and in the widthwise outer portion C1 of the joining flange portion, energy administration occurs due to an increase in speed. Insufficient melting occurred and insufficient melting occurred. In either case, there was a problem that sufficient welding strength and welded airtightness could not be ensured due to a decrease in welding quality.
[0007]
The present invention has been made paying attention to such problems, and in particular, even if there is a difference in the speed of the laser beam between the inner part and the outer part in the width direction of the joining flange part, the welding quality while allowing the speed difference. It is intended to provide a resin component and a laser welding method for the resin component that are considered so as not to affect the process.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, a resin part is formed by welding one resin member that transmits laser light and the other resin member that absorbs laser light by welding. It is assumed that the resin parts are integrated by abutting the formed flange portions together and then irradiating a laser beam from the side of the flange portion of one resin member to weld the resin members together. In addition, in the portion where the joining flange portion to be welded is bent with a predetermined curvature, the thickness of the outer portion in the width direction of the joining flange portion in one resin member is smaller than that of the central portion in the width direction and The thickness of the inner portion in the width direction is set to be larger than that of the central portion in the width direction.
[0009]
In this case, as described in claim 2, in the portion where the joint flange portion to be welded is bent, the width of the joint flange portion of one resin member from the width direction outer side portion toward the width direction inner side portion thereof It is assumed that the wall thickness changes continuously or stepwise.
[0010]
Further, the invention described in claim 3 is obtained by capturing the technique described in claim 1 as a laser welding method, and includes one resin member that transmits laser light and another resin member that absorbs laser light. Are bonded to each resin member by joining the pre-formed joint flanges as welding allowances, and then irradiating with laser light from the side of the joint flange of one resin member It is premised on a laser welding method in which resin members are welded together by relative movement in the longitudinal direction of the flange portion to obtain a resin component. In addition, in the portion where the joining flange portion to be welded is bent with a predetermined curvature, the thickness of the outer portion in the width direction of the joining flange portion in one resin member is smaller than that of the central portion in the width direction and The thickness of the inner portion in the width direction is set to be larger than that of the central portion in the width direction.
[0011]
Therefore, in the inventions according to claims 1 to 3, the joining flange portion to be a welding allowance of one resin member that transmits laser light is circular, or the joining flange portion has a predetermined curvature at the corner portion. In the case of bending with a curve, since the thickness is relatively small at the width direction outer side portion of the joining flange portion, the transmittance is increased, and the energy loss of the laser beam is reduced. On the contrary, since the thickness is relatively large at the inner side in the width direction of the joining flange portion, the transmittance is lowered, and the energy loss of the laser light is increased.
[0012]
On the other hand, as described above, the laser beam moving in the corner portion of the joint flange portion has a relatively high moving speed in the outer portion in the width direction of the joint flange portion, and the laser energy applied to the joint flange portion is insufficient. On the other hand, the moving speed is relatively slow at the inner portion in the width direction, and the laser energy applied to the joining flange portion is excessive.
[0013]
As a result, the laser energy loss due to the above-mentioned wall thickness difference and the excess or deficiency of the laser energy due to the difference in the laser beam speed between the inside and outside of the joining flange portion are offset, and the inside and outside of the joining flange portion are actually The laser energy applied to the can can be made substantially uniform.
[0014]
【The invention's effect】
According to the first to third aspects of the present invention, in the corner portion or the like of the joining flange portion that is directly irradiated with the laser beam, the difference in the speed of the laser beam between the outer portion in the width direction and the inner portion occurs. Assuming that it is inevitable, the laser energy that is actually administered in the widthwise outer portion and the inner portion of the joint flange portion is positively given a thickness difference between the widthwise outer portion and the inner portion of the joint flange portion. Becomes almost uniform, and the occurrence of problems such as insufficient melting is eliminated, and the joining strength and airtightness at the joining flange portion are improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 are views showing a preferred embodiment of the present invention, and show an example in which a resin intake manifold in an internal combustion engine is welded and joined as a resin component.
[0016]
As shown in the figure, the intake manifold 1 as a resin part is formed as a generally flat rectangular tubular body structure, and is a resin member having joint flanges 2a and 3a formed on the entire circumference. Two halved parts 2 and 3 are prepared, the joining flanges 2a and 3a of the halved parts 2 and 3 are brought into contact with each other, and welded joining with the laser beam 4 is performed on the part, thereby joining flanges 2a and 2a, 3a is integrated as a welding allowance.
[0017]
Of the two halved parts 2 and 3, one half part 2 has a characteristic of absorbing laser light 4 and the other half part 3 has a characteristic of transmitting laser light. The split component 2 is molded with a resin material that absorbs the laser beam 4, and the other half component 3 is molded with a resin material that transmits the laser beam 4. For example, when each of the halved parts 2 and 3 is injection-molded, one halved part 2 is molded using a resin material in which a PA6GF reinforcing material is mixed with a colorant that absorbs laser light 4, and the other half part 2 is molded. The split part 3 is molded using a PA6GF reinforcing material mixed with a colorant that transmits the laser beam 4 as a resin material.
[0018]
In the welding by the laser beam 4, if the laser beam 4 is irradiated from the one half component 3 side by the laser head 5, the laser head 5 and the half components 2 and 3 are joined to each other by the width dimension of the joining flange portions 2a and 3a. Is performed by relative movement along a center line that bisects the laser beam trajectory 6. For example, the joining flange portions 2a and 3a are welded to each other by moving the laser head 5 along the laser beam locus 6 by NC control or the like with the half parts 2 and 3 as the fixed side. That is, since one half component 3 transmits the laser beam 4 and the other half component 2 absorbs the laser beam 4, the laser beam 4 transmitted through the joint flange portion 3a of the one half component 3 is It is absorbed by the joint flange portion 3a of the other half component 2 at the joint surface 7 (the mating surface between the joint flange portions 2a and 3a), and a part of the joint flange portion 3a is melted. At the same time, a part of the joining flange part 3a of the other half part 3 is melted by receiving the heat of fusion, and thereby the joining flange parts 2a and 3a are welded and joined together.
[0019]
In this case, as shown in an enlarged view in FIG. 2, the focal point 4a of the spot-like laser beam 4 having a predetermined diameter moves at the corner portion C of the joint flange portions 2a and 3a while drawing an arc-shaped locus having a predetermined curvature. Therefore, even if the moving speed of the laser beam 4 is appropriate at the center portion in the width direction of the joint flange portions 2a and 3a (portion that coincides with the laser beam locus 6), the width of the joint flange portions 2a and 3a. The moving speed of the laser light 4 is high in the direction outer portion C1, and conversely, the moving speed of the laser light 4 is low in the width direction inner portion C2 of the joining flange portions 2a and 3a. Such a difference in speed of the laser beam 4 in the width direction of the joining flange portions 2a and 3a causes excess or deficiency of laser energy actually administered to the welded portion as described above.
[0020]
Therefore, in the present embodiment, as shown in FIG. 3, the corner portion C of the joint flange portion 3 a of one half-part 3 formed of a resin material that transmits the laser light 4 is formed in the width direction outer portion C <b> 1. The joint flange portion 3a has a width direction outer portion C1 to an inner portion C2 so that the thickness is smaller than the thickness t0 of the central portion and the thickness of the width direction inner portion C2 is larger than the thickness t0 of the central portion. The thickness is set to gradually increase with a continuous change from t1 to t2 (t1 <t2). More specifically, the thickness change as described above is provided by making the corner portion C of the joint flange portion 3 a an inclined surface in which the flange surface 3 c is not parallel to the joint surface 7.
[0021]
Therefore, according to the present embodiment, in the corner portion C of the joining flange portion 3a to be the welding allowance of the half component 3 formed of the resin material that transmits the laser beam 4, the width direction outer side portion C1 thereof is Since the thickness is relatively small compared to the inner portion C2, the transmittance of the laser light 4 is increased, and the energy loss of the laser light 4 is reduced. On the contrary, the inner side portion C2 in the width direction of the joint flange portion 3a is relatively thicker than the outer portion C1, so that the transmittance of the laser beam 4 is lowered and the energy loss of the laser beam 4 is increased.
[0022]
On the other hand, as described above, the laser beam 4 that moves in the corner portion C of the joint flange portion 3a has a relatively high moving speed in the width direction outer side portion C1 of the joint flange portion 3a. While the laser energy to be applied is insufficient, the moving speed is relatively small in the width direction inner portion C2 of the joint flange portion 3a, and the laser energy to be applied to the joint surface 7 is excessive.
[0023]
As a result, the degree of laser energy loss due to the thickness difference in the width direction of the joining flange portion 3a and the excess or deficiency of the laser energy due to the difference in the speed of the laser light between the inner portion C2 and the outer portion C1 of the joining flange portion 3a cancel each other. Thus, the laser energy that is actually administered can be made substantially uniform between the width direction inner portion C2 and the outer portion C1 of the joint flange portion 3a.
[0024]
As a result, it is possible to prevent the occurrence of defects such as deterioration of resin and insufficient melting that have occurred in the past due to excess or deficiency of laser energy, and the welding strength and airtightness at the welded portion that is the joining surface 7 are dramatically improved. To improve.
[0025]
4 to 6 show second to fourth embodiments of the present invention.
[0026]
In the second embodiment shown in FIG. 4, as is apparent from a comparison with FIG. 3, the corner portion C of the joint flange portion 3 a of one half part 3 formed of a resin material that transmits the laser beam 4. The joining surface 7 is non-parallel to the flange surface 3c so that the thickness of the joining flange portion 3a gradually increases from the widthwise outer portion C1 to the inner portion C2 with a continuous change of t1 to t2. As an inclined surface. In this case, the joining flange portion 2a of the other halved part 2 is also accompanied by a reverse wall thickness change.
[0027]
Moreover, in 3rd Embodiment shown in FIG. 5, about the corner part C of the joining flange part 3a among the one half parts 3 formed with the resin material which permeate | transmits the laser beam 4, of the joining flange part 3a The flange surface 3c is formed in a step-like shape so that the thickness dimension gradually increases from the width direction outer portion C1 toward the inner portion C2 with a stepwise change of t1 to t2.
[0028]
Similarly, in the fourth embodiment shown in FIG. 6, the corner portion C of the joint flange portion 3 a of one half part 3 formed of the resin material that transmits the laser beam 4 is connected to the joint flange portion 3 a. The joint surface 7 is formed in a stepped shape so that the thickness dimension gradually increases from the widthwise outer portion C1 toward the inner portion C2 with a step change of t1 to t2. In this case, the joining flange portion 2a of the other halved part 2 is also accompanied by a change in thickness of the reverse gradient.
[0029]
In these second to fourth embodiments, as compared with the first embodiment, the thickness dimension gradually increases from the width direction outer side portion C1 to the inner side portion C2 of the joint flange portion 3a. There is no change in the setting, and therefore the same function as that of the first embodiment is exhibited.
[0030]
FIG. 7 shows a fifth embodiment of the present invention. When the laser beam 4 is irradiated from one half-part 3 side formed with a resin material that transmits the laser beam 4, the bonding flange portion 3a is shown. In the corner portion C, the optical axis of the laser beam 4 is irradiated with being inclined at a predetermined angle θ toward the inner side portion C2 in the width direction of the joining flange portion 3a.
[0031]
According to the fifth embodiment, as is clear from the figure, the transmission distance L1 of the laser beam 4 is smaller in the width direction outer portion C1 of the joining flange portion 3a than in the inner portion C2 (L1 <L2). Since the energy loss of the laser beam 4 is reduced accordingly, the same function as that of the first to fourth embodiments is exhibited as a result.
[Brief description of the drawings]
FIGS. 1A and 1B are views when laser welding is performed on an intake manifold as a preferred first embodiment of the present invention, FIG. 1A is a plan view thereof, FIG. 1B is a side view thereof, and FIG. Explanatory drawing of the right side of figure (A).
FIG. 2 is an enlarged view of a portion B in FIG.
FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG.
4 is a diagram showing a second embodiment of the present invention, and is a cross-sectional view of a portion equivalent to FIG. 3. FIG.
FIG. 5 is a diagram showing a third embodiment of the present invention, and is an enlarged cross-sectional view of a portion equivalent to FIG.
6 is a diagram showing a fourth embodiment of the present invention, and is an enlarged cross-sectional view of a portion equivalent to FIG. 3. FIG.
7 is a diagram showing a fifth embodiment of the present invention, and is a cross-sectional view of a portion equivalent to FIG. 3. FIG.
[Explanation of symbols]
1 ... Intake manifold (resin parts)
2 ... Half parts (resin materials)
2a ... Joining flange part 3 ... Half part (resin member)
3a ... Joining flange part 4 ... Laser beam 5 ... Laser head 7 ... Joining surface C ... Corner part C1 ... Outer width part C2 ... Inner part in the width direction

Claims (4)

レーザ光を透過する一方の樹脂部材とレーザ光を吸収する他方の樹脂部材とを溶着をもって接合してなる樹脂部品にして、それぞれの樹脂部材に溶着代として予め形成した接合フランジ部同士を突き合わせた上で、一方の樹脂部材の接合フランジ部側からレーザ光を照射して樹脂部材同士を溶着することにより一体化した樹脂部品であって、
溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分の肉厚が幅方向中央部分のそれよりも小さく且つ幅方向内側部分の肉厚が幅方向中央部分のそれよりも大きく設定されていることを特徴とする樹脂部品。The resin parts formed by welding one resin member that transmits laser light and the other resin member that absorbs laser light are welded together, and the joint flange portions that are formed in advance as welding margins on each resin member are butted together. Above, it is a resin part integrated by irradiating laser light from the joint flange portion side of one resin member and welding the resin members together,
In the portion where the joint flange portion to be welded is bent with a predetermined curvature, the thickness of the outer portion in the width direction of the joint flange portion of one resin member is smaller than that of the central portion in the width direction and the inner portion in the width direction. The resin part is characterized in that the thickness of is set larger than that of the central portion in the width direction. 溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分から幅方向内側部分に向かってその肉厚が連続的もしくは段階的に変化していることを特徴とする請求項１に記載の樹脂部品。In the portion where the joining flange portion to be welded is bent with a predetermined curvature, the thickness of one resin member is continuously or stepwise from the width direction outer portion to the width direction inner portion of the joining flange portion. The resin component according to claim 1, wherein the resin component is changed. レーザ光を透過する一方の樹脂部材とレーザ光を吸収する他方の樹脂部材とを溶着をもって接合してなる樹脂部品にして、それぞれの樹脂部材に溶着代として予め形成した接合フランジ部同士を突き合わせた上で、一方の樹脂部材の接合フランジ部側からレーザ光を照射して接合フランジ部の長手方向に相対移動させることにより樹脂部材同士を溶着して樹脂部品とするにあたり、
溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分では、一方の樹脂部材における接合フランジ部の幅方向外側部分の肉厚が幅方向中央部分のそれよりも小さく且つ幅方向内側部分の肉厚が幅方向中央部分のそれよりも大きく設定されていることを特徴とする樹脂部品のレーザ溶着方法。The resin parts formed by welding one resin member that transmits laser light and the other resin member that absorbs laser light are welded together, and the joint flange portions that are formed in advance as welding margins on each resin member are butted together. On the one side of the resin member, the laser beam is irradiated from the side of the joint flange part and moved relative to the longitudinal direction of the joint flange part to weld the resin members together to form a resin part.
In the portion where the joint flange portion to be welded is bent with a predetermined curvature, the thickness of the outer portion in the width direction of the joint flange portion of one resin member is smaller than that of the central portion in the width direction and the inner portion in the width direction. The resin part laser welding method is characterized in that the thickness of the resin part is set larger than that of the central portion in the width direction. レーザ光を透過する一方の樹脂部材とレーザ光を吸収する他方の樹脂部材とを溶着をもって接合してなる樹脂部品にして、それぞれの樹脂部材に溶着代として予め形成した接合フランジ部同士を突き合わせた上で、一方の樹脂部材の接合フランジ部側からレーザ光を照射して接合フランジ部の長手方向に相対移動させることにより樹脂部材同士を溶着して樹脂部品とするにあたり、
溶着代となるべき接合フランジ部が所定曲率をもって屈曲している部分を溶着する際には、レーザ光の光軸を接合フランジ部の幅方向内側に傾けた状態で溶着を行うことを特徴とする樹脂部品のレーザ溶着方法。The resin parts formed by welding one resin member that transmits laser light and the other resin member that absorbs laser light are welded together, and the joint flange portions that are formed in advance as welding margins on each resin member are butted together. In the above, when irradiating a laser beam from the bonding flange portion side of one resin member and relatively moving in the longitudinal direction of the bonding flange portion, the resin members are welded together to form a resin component.
When welding a portion where the joining flange portion to be welded is bent with a predetermined curvature, welding is performed in a state where the optical axis of the laser beam is inclined inward in the width direction of the joining flange portion. Laser welding method for resin parts.
JP2003052333A 2003-02-28 2003-02-28 Resin parts and laser welding method Expired - Fee Related JP4003666B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006231875A (en) * 2005-02-28 2006-09-07 Gp Daikyo Corp Fluid filter means for vehicle and its manufacturing method
US7510620B2 (en) 2003-06-11 2009-03-31 Toyota Jidosha Kabushiki Kaisha Process for laser welding resinous members, apparatus for the same and laser-welded resinous product
EP2255952A1 (en) * 2009-05-29 2010-12-01 Stanley Electric Co., Ltd. Method for manufacturing resin mold assembly
JP2011161633A (en) * 2010-02-04 2011-08-25 Stanley Electric Co Ltd Method for producing resin molding
US8424030B2 (en) 2008-08-08 2013-04-16 Hitachi Media Electronics Co., Ltd. Optical pickup device and laser welding structure of optical components

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7510620B2 (en) 2003-06-11 2009-03-31 Toyota Jidosha Kabushiki Kaisha Process for laser welding resinous members, apparatus for the same and laser-welded resinous product
US8038828B2 (en) 2003-06-11 2011-10-18 Toyota Jidosha Kabushiki Kaisha Process for laser welding resinous members, apparatus for the same and laser-welded resinous product
JP2006231875A (en) * 2005-02-28 2006-09-07 Gp Daikyo Corp Fluid filter means for vehicle and its manufacturing method
JP4592446B2 (en) * 2005-02-28 2010-12-01 ダイキョーニシカワ株式会社 Vehicle fluid filter device and method of manufacturing the same
US8424030B2 (en) 2008-08-08 2013-04-16 Hitachi Media Electronics Co., Ltd. Optical pickup device and laser welding structure of optical components
EP2255952A1 (en) * 2009-05-29 2010-12-01 Stanley Electric Co., Ltd. Method for manufacturing resin mold assembly
US8506872B2 (en) 2009-05-29 2013-08-13 Stanley Electric Co., Ltd. Method for manufacturing resin mold assembly
JP2011161633A (en) * 2010-02-04 2011-08-25 Stanley Electric Co Ltd Method for producing resin molding

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