JP2008119839A - Laser welding method for resin material and resin component - Google Patents
Laser welding method for resin material and resin component Download PDFInfo
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- JP2008119839A JP2008119839A JP2006302778A JP2006302778A JP2008119839A JP 2008119839 A JP2008119839 A JP 2008119839A JP 2006302778 A JP2006302778 A JP 2006302778A JP 2006302778 A JP2006302778 A JP 2006302778A JP 2008119839 A JP2008119839 A JP 2008119839A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—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
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
- B29C65/1648—Laser beams characterised by the way of heating the interface radiating the edges of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—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
- B29C66/114—Single butt joints
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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
- B29C66/40—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
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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
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
- B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
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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
- B29C66/65—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
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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
- B29C66/65—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
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
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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
- B29C66/70—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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- 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
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements
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- Engineering & Computer Science (AREA)
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- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
本発明は、レーザ光を照射して樹脂材同士を溶着するレーザ溶着方法およびこのレーザ溶着方法を適用して製造された樹脂部品に関する。 The present invention relates to a laser welding method in which resin materials are welded together by irradiating a laser beam, and a resin component manufactured by applying this laser welding method.
従来、樹脂材同士のレーザ溶着は、一般にレーザ光に対して透過性を有するレーザ透過性樹脂材とレーザ光に対して吸収性を有するレーザ吸収性樹脂材とを重ね合せて、レーザ透過性樹脂材を通して両樹脂材の合せ面にレーザ光を照射し、レーザ吸収性樹脂材の発熱によってレーザ透過性樹脂材も加熱して合せ部を融合させる方法で行われていた。なお、レーザ吸収性樹脂材としては、カーボンブラックを含有させたものが多く用いられるが、最近では、ニグロシン染料、アニリンブラックなどを含有させたものも用いられている(たとえば、特許文献1参照)。 Conventionally, laser welding between resin materials is generally performed by superimposing a laser-transmitting resin material that is transparent to laser light and a laser-absorbing resin material that is absorbing to laser light, to form a laser-transmitting resin. Laser beam is irradiated to the mating surface of both resin materials through the material, and the laser transmitting resin material is also heated by the heat generation of the laser absorbing resin material to fuse the mating portions. As the laser-absorbing resin material, a material containing carbon black is often used, but recently, a material containing nigrosine dye, aniline black, or the like is also used (for example, see Patent Document 1). .
図3は、車載用電子部品の収納ケースの製造に上記したレーザ溶着方法を適用した例を示したもので、この場合は、ケース本体1をレーザ吸収性樹脂材により、カバー2をレーザ透過性樹脂材によりそれぞれ形成し、ケース本体1にカバー2を重ね合せた状態で、カバー2の上方からレーザ光Laを照射して溶着を行う。
FIG. 3 shows an example in which the laser welding method described above is applied to the manufacture of a storage case for a vehicle-mounted electronic component. In this case, the case body 1 is made of a laser-absorbing resin material and the
ところで、上記した車載用電子部品の収納ケースは、温度変化や湿度変化が大きい環境に置かれることから、環境の変化に耐える高いシール性(水密性、気密性)が要求される。しかし、上記したように樹脂材同士を重ね合せて溶着を行うレーザ溶着方法においては、レーザ透過性樹脂材の透過率のばらつきによって加熱、溶融状態が変化し、未溶着、発泡、焼け(焦げ)などの不具合が発生しやい、という問題があった。特に、上記収納ケースのカバー2のような大型品(一例として、80mm×30mm)の樹脂成形においては、樹脂の流動性の制約や寸法安定性の確保などの都合で、多点ゲート配置を採用することが多いが、この場合には、成形体内にウエルドが形成されるため、前記透過率の大幅な変化が避けられず、前記した不具合の発生も顕著となる。また、この種の収納ケースには、強度、耐熱性、成形性等を考慮してポリブチレンテレフタレート(PBT)またはポリフェニレンスルフィド(PPS)が使用されるが、これら樹脂材は、ポリエチレン(PE)やポリプロピレン(PP)と比べて透過率が低いため、レーザ光の出力を高く設定しなければならず、過熱により発泡が生じる危険があって、所望のシール性を有する樹脂部品を安定して得ることが困難である、という問題もあった。
By the way, since the storage case for the above-described vehicle-mounted electronic component is placed in an environment where temperature change and humidity change are large, high sealing performance (watertightness, airtightness) that can withstand environmental changes is required. However, as described above, in the laser welding method in which the resin materials are overlapped and welded, the heating and melting states change due to the variation in the transmittance of the laser-transmitting resin material, and the unwelded, foamed, burned (burned) There was a problem that problems such as these are likely to occur. In particular, in resin molding of large products (for example, 80 mm x 30 mm) such as the
一方、レーザ溶着方法としては、レーザ吸収性樹脂材同士を突き合せ、この突き合せ部にレーザ光を照射して、両樹脂材を突き合せ溶着する方法が従来より知られている。この突き合せ溶着方法によれば、樹脂材同士の突き合せ部に直接レーザ光を照射するので、これを上記収納ケースの製造に適用すれば、透過率のばらつきやウエルド形成に起因する不具合発生を防止できるものと期待される。なお、上記収納ケースの製造に突き合せ溶着方法を適用する場合は、前出図3に一点鎖線で示すように、ケース本体1とカバー2との合せ部に対してその側方からレーザ光Laが照射されることになる。しかしながら、実際にレーザ吸収性樹脂材同士を突き合せ溶着すると、レーザ光のエネルギーの大部分が照射表面で吸収されてしまうため、溶込み深さが極めて浅くなり、所望のシール性を確保することが困難であった。なお、溶込み深さを拡大すべく、単にレーザ光の出力を大きくすると、照射表面が爆発的に過熱して発泡や焼けが生じ、溶着そのものが不可能となる。
On the other hand, as a laser welding method, there has been conventionally known a method in which laser-absorbing resin materials are butted together and a laser beam is irradiated to the butted portion so that both resin materials are butted and welded. According to this butt welding method, since the laser beam is directly irradiated to the butt portion between the resin materials, if this is applied to the manufacture of the storage case, there is a problem of occurrence of defects due to variation in transmittance and weld formation. This is expected to be prevented. When the butt welding method is applied to the production of the storage case, as shown by the one-dot chain line in FIG. 3, the laser beam La from the side with respect to the joint portion of the case body 1 and the
そこで、たとえば、特許文献2には、レーザ吸収性樹脂材同士の突き合せ部に照射するレーザ光の出力を落として、レーザ光の走査を複数回繰返すことが提案されている。しかし、このような対策によれば、レーザ光の走査を複数回繰返すため、溶着に時間がかかり、上記収納ケースのように全周の溶着を必要する場合は、生産性の低下が避けられないようになる。
本発明は、上記した技術的背景に鑑みてなされたもので、その課題とするところは、生産性を犠牲にすることなく、レーザ吸収性樹脂材同士を安定してかつ十分なる溶込み深さを確保して突き合せ溶着できるレーザ溶着方法を提供し、併せて該方法を適用して製造された樹脂部品を提供することにある。 The present invention has been made in view of the technical background described above, and the problem is that the laser-absorbing resin material can be stably and sufficiently penetrated without sacrificing productivity. It is an object to provide a laser welding method capable of ensuring butt welding and providing a resin part manufactured by applying the method.
上記課題を解決するため、本発明に係る樹脂材のレーザ溶着方法は、レーザ吸収性樹脂材同士を突き合せて、両樹脂材を突き合せ溶着するレーザ溶着方法において、少なくとも0.4mmの溶込み深さを確保することを特徴とする。このように、少なくとも0.4mmの溶込み深さとすることで、所望のシール性を確保することができる。 In order to solve the above-mentioned problems, a laser welding method for a resin material according to the present invention is a laser welding method in which laser-absorbing resin materials are butted together and both resin materials are butted and welded. It is characterized by ensuring depth. Thus, a desired sealing performance can be ensured by setting the penetration depth to at least 0.4 mm.
以下に、本発明の態様をいくつか例示し、それらについて項分けして説明する。なお、以下の説明でいうレーザ吸収性樹脂材とは、波長が1000nm程度の近赤外レーザ光に対して吸収性を有する樹脂の意味である。 In the following, some aspects of the present invention will be illustrated and described. In addition, the laser absorptive resin material in the following description means a resin having absorptivity with respect to near infrared laser light having a wavelength of about 1000 nm.
(1)黒色着色剤を含有させたレーザ吸収性樹脂材同士を突き合せ、該突き合せ部にレーザ光を照射して、両樹脂材を突き合せ溶着するレーザ溶着方法において、前記黒色着色剤として特定の着色剤を選択することにより、少なくとも0.4mmの溶込み深さを確保することを特徴とする樹脂材のレーザ溶着方法。 (1) In a laser welding method in which laser-absorbing resin materials containing a black colorant are butted together, and the butted portion is irradiated with laser light, and both resin materials are butted and welded, the black colorant A resin welding method for a resin material, wherein a penetration depth of at least 0.4 mm is secured by selecting a specific colorant.
このように行うレーザ溶着方法においては、レーザ吸収性樹脂材に含有させる黒色着色剤として、カーボンブラックよりもレーザ吸収を低く抑える着色剤を選択することで、突き合せ部に照射されるレーザ光の透過深さが拡大し、少なくとも0.4mmの溶込み深さを確保することができる。したがって、レーザ吸収性を有する樹脂材同士を突き合せ溶着しても、十分高いシール性を確保することができる。また、重ね合せ溶着のようにレーザ透過性樹脂材の透過率のばらつきの影響を受けることがないので、ウエルドを有する樹脂材の溶着はもとより、比較的透過率の低いPBTやPPSの溶着を安定して行うことができる。さらに、レーザ吸収が低く抑えられることから、照射表面での過熱が抑えられ、レーザ光の出力を特別に低く落してレーザ走査を複数回行う必要もなくなって、生産性が犠牲になることもない。 In the laser welding method performed in this way, by selecting a colorant that suppresses laser absorption lower than that of carbon black as a black colorant to be included in the laser-absorbing resin material, The penetration depth is expanded and a penetration depth of at least 0.4 mm can be ensured. Therefore, a sufficiently high sealing performance can be ensured even if the resin materials having laser absorptivity are butt-welded. In addition, since it is not affected by variations in the transmittance of the laser-transmitting resin material unlike the overlap welding, it is possible to stabilize the welding of PBT or PPS having a relatively low transmittance as well as the welding of a resin material having a weld. Can be done. Furthermore, since laser absorption is suppressed to a low level, overheating on the irradiated surface is suppressed, and it is not necessary to perform laser scanning a plurality of times with a particularly low output of laser light, so that productivity is not sacrificed. .
(2)黒色着色剤として、ニグロシン染料を選択することを特徴とする(1)項に記載の樹脂材のレーザ溶着方法。 (2) The nigrosine dye is selected as the black colorant, and the resin material laser welding method according to item (1).
本レーザ溶着方法において、樹脂材に含有させる黒色着色剤としては、カーボンブラックよりもレーザ吸収を低く抑えるものであれば、特にその種類を問わないが、ニグロシン染料は、このような着色剤として有用である。このニグロシン染料を含有させた樹脂材は、前記特許文献1に記載されるように重ね合せ溶着の分野での使用実績があるので、入手が容易であり、本レーザ溶着方法で用いる樹脂材として好適である。 In the present laser welding method, the black colorant contained in the resin material is not particularly limited as long as the laser absorption is lower than that of carbon black, but the nigrosine dye is useful as such a colorant. It is. Since the resin material containing this nigrosine dye has been used in the field of superposition welding as described in Patent Document 1, it is easy to obtain and is suitable as a resin material used in this laser welding method. It is.
(3)上記(1)項または(2)項に記載のレーザ溶着方法を適用して製造された樹脂部品であって、表面からの溶着深さが、0.4mm以上であることを特徴とする樹脂部品。 (3) A resin part manufactured by applying the laser welding method described in the above item (1) or (2), wherein the welding depth from the surface is 0.4 mm or more. Resin parts to be used.
(4)電子部品の収納ケースとして構成されていることを特徴とする(3)項に記載の樹脂部品。 (4) The resin component according to item (3), which is configured as a storage case for electronic components.
(5)レーザ吸収性樹脂が、ポリブチレンテレフタレード(PBT)またはポリフェニレンスルフィド(PPS)であることを特徴とする(3)項または(4)項に記載の樹脂部品。 (5) The resin component as described in (3) or (4), wherein the laser-absorbing resin is polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS).
本(3)〜(5)項に記載の樹脂部品においては、表面からの溶着深さが、0.4mm以上となっているので、強度はもちろん、シール性も十分となり、多方面に用途が拡大する。 In the resin parts described in the items (3) to (5), since the welding depth from the surface is 0.4 mm or more, not only the strength but also the sealing property is sufficient, and the application is versatile. Expanding.
本発明に係るレーザ溶着方法によれば、樹脂溶着部の生産性を犠牲にすることなく、レーザ吸収性樹脂材同士を安定してかつ十分なる溶込み深さを確保して突き合せ溶着できるので、その利用価値は大なるものがある。 According to the laser welding method of the present invention, the laser-absorbing resin materials can be butt-welded while ensuring a sufficient penetration depth without sacrificing the productivity of the resin welded portion. , Its utility value is great.
また、本発明に係る樹脂部品によれば、強度はもちろん、シール性も十分となり、多方面に用途が拡大する。 Moreover, according to the resin component which concerns on this invention, not only intensity | strength but sufficient sealing performance becomes sufficient, and a use expands to many fields.
以下、本発明を実施するための最良の形態を添付図面に基いて説明する。 The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
図1は、本発明に係るレーザ溶着方法の1つの実施形態を示したものである。本レーザ溶着方法は、レーザ吸収性を有する2つの樹脂材11と12とを突き合せて、その突き合せ部13に対し、図示を略すレーザトーチからレーザ光(近赤外レーザ光)Laを照射して、両樹脂材11と12とを突き合せ溶着するものである。
FIG. 1 shows one embodiment of a laser welding method according to the present invention. In this laser welding method, two
レーザ吸収性を有する樹脂材11、12としては、ここでは黒色着色剤の1つであるニグロシン染料を含有させたものを用いている。この場合、ニグロシン染料を含有させる樹脂の種類は任意であり、透過率の高いポリエチレン(PE)やポリプロピレン(PP)であっても、透過率の低いポリブチレンテレフタレート(PBT)やポリフェニレンスルフィド(PPS)であってよい。また、樹脂材11と樹脂材12との組合せは、互いに相溶性があれば、異種の樹脂同士の組合せであってもよいが、溶着部の均質性を高めるには、同種の樹脂同士を組合せるのが望ましい。
Here, as the
突き合せ部13に照射するレーザ光Laの種類は、近赤外レーザ光であれば任意であり、YAGレーザ、ヘリウム−ネオンレーザ、半導体レーザ、ガラス−ネオジウムレーザ、ルビーレーザ、クリプトンレーザ、アルゴンレーザ、水素レーザ、窒素レーザ等を用いることができる。
The type of the laser beam La applied to the
レーザ溶着に際しては、樹脂材11と樹脂材12とを突き合せた後、その突き合せ部13に向けて、レーザトーチから所定の出力のレーザ光Laを照射させ、該レーザ光Laを突き合せ部13の合せ線に沿って所定の速度で走査させる。このとき、レーザ光Laの走査は、樹脂材11、12の位置を固定してレーザトーチを移動させても、レーザトーチの位置を固定して樹脂材11、12を移動させてもよい。このレーザ光Laの走査により、樹脂材11と12の突き合せ部13が連続に溶着され、これにより所定の樹脂部品が完成する。
At the time of laser welding, after the
上記のように行うレーザ溶着においては、突き合せ溶着すべき2つの樹脂材11、12が共に、ニグロシン染料を含有しているので、照射表面でのレーザ吸収が低く抑えられ、レーザ光Laは、表面から深い部位まで到達する。これにより、突き合せ部13における溶込み深さ(溶着深さ)は、強度およびシール性を満足する十分なる深さとなる。図1中、14は、突き合せ部13に形成された溶着部を示しており、その溶着深さDは、0.4mm以上となっている。因みに、同じ黒色着色剤であるカーボンブラックを含有させた樹脂材同士をレーザ光により突き合せ溶着した場合は、レーザ光の照射表面でレーザ光のほとんどが吸収されるため、溶着部の深さは、0.2mm程度が限度であり、この場合は、強度およびシール性の面で問題が生じる。
In the laser welding performed as described above, since the two
前出図3に示した電子部品の収納ケースを構成するケース本体1とカバー2とを、後述の種々の樹脂を用いて成形し、図2に示すようにケース本体1にカバー2を合せて、両者の合せ部に横方向または上方向からレーザ光Laを照射し、両者を突き合せ方式または重ね合せ方式により全周溶着して収納ケースを完成させた。また、ケース本体1の底部には、予めエア吹込口3を設け、収納ケース完成後、ケース本体1の底面にエア吹込口3に連通するエア管4を接合した。ここで、収納ケースの全体大きさは、長さLが80mm、紙面に垂直方向の幅が30mm、高さHが16mmとなっている。また、収納ケースを構成するケース本体1は、その肉厚tが2.0mm、その高さhが15mmとなっており、一方、カバー2の板厚Tは1.0mmとなっている。
The case main body 1 and the
ケース本体1およびカバー2の樹脂としては、PBTとPPSとを選択し、表1に示すように、これに着色剤としてニグロシン染料(N)、カーボンブラック(C)を種々の割合で加えた有着色のもの(レーザ吸収性樹脂)と着色剤を加えない未着色のもの(レーザ透過性樹脂)とを用意し、これら樹脂をケース本体1とカバー2とに使い分けて成形を行った。成形は、カバー2については、その長手方向の中間部位にウエルドが形成される条件とウエルドが形成されない条件との2つの条件で行い、表1に示すようにウエルド有り、無しの2種類のカバー2を用意した。
As resin of case body 1 and
上記したように用意されたケース本体1とカバー2とを、表1に示すように種々に組合せて溶着を行った。溶着は、合せ部に対するレーザ光Laの照射径を1.5mmに設定し、表1に示すようにレーザ光Laの出力を種々に変更して、30mm/秒の速度で走査させる条件で行った。そして、溶着後、完成した収納ケースについて、漏れ試験を行ってシール性を確認すると共に、最終的に破壊試験を行って溶着深さ(溶込み深さ)を測定した。漏れ試験は、前記収納ケースを冷熱サイクル槽内に納めて、−40℃×30分〜140℃×30分の冷熱サイクルを繰返し、所定サイクル終了ごとに水槽に移して、エア管4を通して収納ケース内にエア圧0.2MPaのエアを吹込み、溶着部からの漏れを目視により観察する方法で行った。表1は、前記した漏れ試験および破壊試験の結果を示したものである。
The case body 1 and the
表1に示す結果より、区分1〜6に記載されるように、ケース本体1およびカバー2共に、ニグロシン染料(N)を含有させたレーザ吸収性樹脂により成形したものを組合せて、突き合せ方式により溶着した場合は、冷熱サイクルを1000サイクル繰返しても漏れは生ぜず、シール性は極めて良好となっている。また、この区分1〜6の組合せでは、溶着部の溶込み深さが0.4mm以上となっており、前記した良好なシール性は、この溶込み深さが深いことによってもたらされたものと推定される。また、区分1,2と区分3〜6との比較より、ニグロシン染料(N)の含有量が多いほど、溶込み深さが浅くなる傾向にあるが、0.50%含有の区分3〜6でも、少なくとも0.40mmの溶込み深さが得られており、シール性の面で全く問題がないといえる。さらに、区分1〜6内での比較より、PBTとPPSとの樹脂種類、カバー2におけるウエルドの有無が溶込み深さ、シール性にほとんど影響しないことが明らかである。
From the results shown in Table 1, as described in categories 1 to 6, both the case main body 1 and the
これに対し、ケース本体1およびカバー2共に、ニグロシン染料(N)を含有させたレーザ吸収性樹脂により成形したものを組合せて、重ね合せ方式により溶着した場合は、カバー2内をレーザ光Laが透過しないため、区分7,8に記載されるように、当然のこととして溶着不能となっている。また、未着色のレーザ透過性樹脂により成形したカバー2とニグロシン染料(N)を含有させたレーザ吸収性樹脂により成形したケース本体1とを組合せて、重ね合せ溶接を行った場合は、区分9,10および区分13,14に記載されるように、カバー2にウエルドが存在すると、溶着したままでも漏れが生じ(サイクル0)、電子部品の収納ケースの製造にこの組合せを適用することは不可能であることが分かった。また、カバー2にウエルドが存在しない場合でも、500サイクルの冷熱サイクルの繰返しで漏れが生じ、該収納ケースの製造への適用に不安が残ることが明らかとなった。これは、カバー2を構成するレーザ透過性樹脂の透過率のばらつきが影響したためと、推定される。
On the other hand, when the case main body 1 and the
一方、ケース本体1およびカバー2共に、カーボンブラック(C)を含有させたレーザ吸収性樹脂により成形したものを組合せて、突き合せ方式により溶着した場合は、区分11,12および区分15,16に記載されるように、溶着したままでも漏れが生じた(サイクル0)。これは、溶込み深さが0.18mm以下と浅いことに加え、照射表面が爆発的に過熱されて焼けが生じたためであり、電子部品の収納ケースの製造に対するこれらの組合せの適用は、実質不可能である、といえる。
On the other hand, when the case main body 1 and the
1 ケース本体
2 カバー
11、12 レーザ吸収性樹脂材
13 突き合せ部
La レーザ光
DESCRIPTION OF SYMBOLS 1 Case
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Cited By (6)
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JP2010511539A (en) * | 2006-12-08 | 2010-04-15 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Laser welding method |
CN102179932A (en) * | 2010-01-13 | 2011-09-14 | 日东电工株式会社 | Sheet conjugant and manufacture method thereof, reel body, optical film and polarization film |
CN102189683A (en) * | 2010-02-04 | 2011-09-21 | 日东电工株式会社 | Laser bonding method of resin part and laser bonding body of resin part |
JP2013052573A (en) * | 2011-09-02 | 2013-03-21 | Asahi Kasei Chemicals Corp | Onboard resin made hollow component and method for manufacturing the same |
JP2014014733A (en) * | 2012-07-05 | 2014-01-30 | Asahi Kasei Chemicals Corp | Container and method for manufacturing the same |
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WO2007034978A1 (en) * | 2005-09-21 | 2007-03-29 | Orient Chemical Industries, Ltd. | Laser welded material |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010511539A (en) * | 2006-12-08 | 2010-04-15 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Laser welding method |
CN102179932A (en) * | 2010-01-13 | 2011-09-14 | 日东电工株式会社 | Sheet conjugant and manufacture method thereof, reel body, optical film and polarization film |
CN102179932B (en) * | 2010-01-13 | 2015-03-11 | 日东电工株式会社 | Sheet conjugant and manufacture method thereof, reel body, optical film and polarization film |
CN102189683A (en) * | 2010-02-04 | 2011-09-21 | 日东电工株式会社 | Laser bonding method of resin part and laser bonding body of resin part |
JP2013052573A (en) * | 2011-09-02 | 2013-03-21 | Asahi Kasei Chemicals Corp | Onboard resin made hollow component and method for manufacturing the same |
JP2014014733A (en) * | 2012-07-05 | 2014-01-30 | Asahi Kasei Chemicals Corp | Container and method for manufacturing the same |
CN115368701A (en) * | 2022-07-26 | 2022-11-22 | 武汉金发科技有限公司 | Weather-resistant laser-weldable polypropylene composite material and preparation method and application thereof |
CN115368701B (en) * | 2022-07-26 | 2023-12-22 | 武汉金发科技有限公司 | Weather-resistant polypropylene composite material capable of being welded by laser, and preparation method and application thereof |
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