JP4131445B2 - Caulking joint parts - Google Patents

Caulking joint parts Download PDF

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Publication number
JP4131445B2
JP4131445B2 JP2003068701A JP2003068701A JP4131445B2 JP 4131445 B2 JP4131445 B2 JP 4131445B2 JP 2003068701 A JP2003068701 A JP 2003068701A JP 2003068701 A JP2003068701 A JP 2003068701A JP 4131445 B2 JP4131445 B2 JP 4131445B2
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Prior art keywords
caulking
boss
hole
mark
deformation
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JP2004276333A (en
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勇 藁品
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Azbil Corp
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Azbil Corp
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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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/11—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
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/11—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
    • 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
    • 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
    • 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
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/974—Checking completion of joining or correct joining by using indications on at least one of the joined parts by checking the bead or burr form
    • 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
    • B29C65/82—Testing the joint
    • B29C65/8253—Testing the joint by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays
    • 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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、第１部品の貫通孔に通通させた第２部品の合成樹脂製のボスの頭部を加熱溶融変形させて上記貫通孔にかしめて前記第１部品と第２部品とを一体に結合するかしめ結合部品に関する。
【０００２】
【関連する背景技術】
２つの部品を一体化する手法の１つに、第１部品の貫通孔に通通させた第２部品の合成樹脂製のボスの頭部を加熱・加圧して溶融変形させ、この溶融変形部と前記ボスの基部との間に前記第１部品をかしめる技術がある。具体的には電子部品を搭載した回路基板の表面に電子部品を覆う保護カバーを取り付ける際、合成樹脂製の保護カバーの四隅の近傍に突設形成したピン（ボス）を、回路基板に穿設したピン孔（貫通孔）に挿通させ、回路基板の裏面において前記ピンの頭部に加熱体を押し付けて該ピンの頭部を扁平に変形させて前記回路基板上に保護カバーを一体に固定する技術が知られている（例えば特許文献１を参照）。
【０００３】
【特許文献１】
特開平８−１６７６６８号公報
【０００４】
【発明が解決しようとする課題】
ところで一体化の対象が５ｍｍ角程度の小さい部品である場合、例えばピン（ボス）自体が直径１ｍｍ程度の細いものとなり、このピンの頭部を加熱溶融させてかしめ変形させる場合、そのかしめ変形部自体も小さくなることが否めない。そしてそのかしめ結合強度を十分に確保するには、ピン（ボス）の頭部をピン孔（貫通孔）の周囲に所定の拡がり量だけかしめ変形させることが必要となる。
【０００５】
しかしながらこのようなかしめ加工を精度良く行うには、例えば顕微鏡やルーペを用いてかしめ変形量（溶融変形量）を確認しながらかしめ作業を行う必要があり、作業効率が非常に悪い。ちなみにかしめ加工精度が悪い場合、具体的にはかしめ変形量が少ない場合には、僅かな外力を受けてピン（ボス）がピン孔（貫通孔）から抜け落ちる虞があり、また変形量が少ない分、裏面側でのピン（ボス）の突出長が高くなり過ぎる虞がある。逆にかしめ変形量が過剰な場合には、ピン（ボス）の頭部の変形部が薄くなり過ぎてかしめ強度が不足する。この結果、かしめ変形部が僅かな外力を受けて破損し、変形部を失ったピン（ボス）がピン孔（貫通孔）から抜け落ちる虞がある。
【０００６】
本発明はこのような事情を考慮してなされたもので、その目的は、小さな部品における合成樹脂製のピン（ボス）の頭部を加熱変形させて他の部品にかしめ結合する場合であっても、そのかしめ変形量を精度良く調整することができ、またそのかしめ変形量の良否を簡易に検査することのできるかしめ結合部品を提供することにある。
【０００７】
特に本発明は、例えば微小流量を計測する５ｍｍ角程度の小さな部品として実現される流量センサの、例えばプリント基板と合成樹脂製のカバー体とを一体にかしめ結合するに好適な構成要素を備えたかしめ結合部品を提供することを目的としている。
【０００８】
【課題を解決するための手段】
上述した目的を達成するべく本発明に係るかしめ結合部品は、第１部品（例えば基板）に開口された貫通孔を挿通させて第２部品（例えばカバー体）に突設された合成樹脂製のボスを嵌め込み、上記貫通孔から突出した前記ボスの頭部を加熱して前記貫通孔の周囲に溶融変形させて前記第１部品と第２部品とを一体に結合するものであって、
前記第１部品の前記貫通孔の周囲に、前記ボスの頭部の溶融変形量を目視するための、少なくとも前記ボスの適正な溶融変形時にその溶融変形部位にて覆われる第１の部位と、前記ボスの過度な溶融変形時にその溶融変形部位にて覆われる第２の部位とを有するマークを設けたことを特徴としている。
【０００９】
好ましくは前記マークは、前記貫通孔の周囲に付された所定幅の円環状のパターンからなり、その内周縁を上記第１の部位、外周縁を上記第２の部位としたものからなる。
【００１０】
このようなマークを備えておれば、該マークの第１の部位（内周縁）が隠れるまで前記ボスの頭部を加熱溶融変形させ、該マークの第２の部位（外周縁）が見えなくなる前に前記ボスの頭部の加熱溶融変形を停止させるだけで、その加熱溶融変形量（かしめ変形量）を適正化することが可能となる。従ってボスの頭部の加熱変形作業（かしめ作業）の容易化を図り得る。またかしめ結合された部品（チップ部品）を検査する場合には、前記マークの第１および第２の部位がそれぞれ目視できるか否かを調べるだけで、その良否を簡単に判定することができる。従ってその作業効率・検査効率を高めて、信頼性の高い部品だけを容易に選択することが可能となる。
【００１１】
【発明の実施の形態】
以下、図面を参照して本発明の一実施形態に係るかしめ結合部品について説明する。
このかしめ結合部品は図１にその概念を示すように、かしめ用の貫通孔１を備えた第１部品２と、かしめ用の棒状のボス（ピン）３を備えた第２部品４とからなる。そして上記ボス３を前記貫通孔１に嵌め込み、貫通孔１を挿通して突出するボス３の頭部（先端部）を図示しない発熱体を用いて加熱・加圧して前記貫通孔１の周囲に溶融変形させることで、その溶融変形部と第２部品４の表面との間に前記第１部品を挟み込む（かしめる）ものである。
【００１２】
ちなみに貫通孔１は、内径ｄの丸孔として形成される。またボス３はその外径が上記貫通孔１の内径よりも僅かに小さく、前記第１の部品２の厚みｔよりも所定長だけ長い丸棒体として形成される。このボス３の長さは、その頭部をかしめ変形（溶融変形）させる量、具体的には図２(ａ)に示すようにかしめ変形部３ａの大きさ（径；Ｄ）とその高さ（ｈ）に応じて設定される。
【００１３】
さてこのようなかしめ結合部品において本発明が特徴とするところは、図１に示すように第１部品２の表面の貫通孔１の周囲に、ボス３の溶融変形量を目視するためのマーク５を設けた点にある。このマーク５は、例えば上記貫通孔１と同軸に設けられた所定幅の環状パターンからなり、その内周縁を少なくとも前記ボス３が適正に溶融変形したときにそのかしめ変形部３ａにて覆われる第１の部位５ａとし、また前記ボス３が過度に溶融変形したときにそのかしめ変形部３ａにて覆われる第２の部位５ｂとしたものからなる。
【００１４】
具体的にはかしめ変形部３ａの大きさが直径Ｄとなったとき、その高さがｈとなって所望とするかしめ強度が確保される場合には、前記環状パターンからなるマーク５は、その内周縁（第１の部位５ａ）の径Ｄ１および外周縁（第２の部位５ｂ）の径Ｄ２が、［Ｄ１＜Ｄ＜Ｄ２］となるように設定される。このマーク５については、第１部品２の表面に印刷したものであっても良く、或いは金属膜を蒸着したものであっても良い。また第１部品２の表面自体をエッチング等によって凹状または凸状に機械加工したり、梨地状に表面加工してマーク５を形成することも可能である。
【００１５】
このようなマーク５を備えたかしめ結合部品によれば、ボス３の頭部を加熱溶融して貫通孔１の周囲にかしめ変形部３ａを形成する際、マーク５の第１の部位（内縁部）５ａがかしめ変形部３ａに覆われて見えなくなり、またマーク５の第２の部位（外縁部）５ｂが見える状態でその加熱溶融作業（かしめ作業）を停止すれば、これによって図２(ａ)に示すように機械的強度を十分に確保し得る適正なかしめ変形部３ａを形成して第１部品２と第２部品４とを一体に結合することが可能となる。
【００１６】
ちなみにかしめ変形部３ａが図２(ｂ)に示すように、その軸心から外れて偏った状態で形成される場合には、マーク５の第２の部位（外縁部）５ｂの一部がかしめ変形部３ａにて覆われて見えなくなる。この状態は、いわゆる片持ちのかしめ状態であり、かしめ不良である。従って上記第２の部位（外縁部）５ｂの全体を視認することができないことから、これを不良品として排除することが可能となる。
【００１７】
またボス３の頭部を過剰に加熱溶融変形させた場合には、そのかしめ変形部３ａは図２(ｃ)に示すように横方向に拡がって大径化し、しかもその厚みも薄くなる。するとマーク５における第１の部位（内縁部）５ａおよび第２の部位（外縁部）５ｂが共にかしめ変形部３ａにて覆われて見えなくなるので、この状態をもってかしめ不良であると判定することが可能となる。
【００１８】
尚、特に図示しないが、ボス３の頭部の加熱溶融変形量（かしめ量）が不足する場合には、マーク５における第２の部位（外縁部）５ｂのみならず、第１の部位（内縁部）５ａもかしめ変形部３ａにて覆われることがない。従ってかしめマーク５における第１の部位（内縁部）５ａおよび第２の部位（外縁部）５ｂが共に見えることになるので、この状態をかしめ加工前、或いはかしめ不足（かしめ不良）として判定することが可能となる。
【００１９】
従ってマーク５における第１の部位（内縁部）５ａおよび第２の部位（外縁部）５ｂがそれぞれ見えるか（視認し得るか）否かを判定するだけで、ボス３の頭部のかしめ変形による第１部品２と第２部品４との結合一体化が適正になされたいるか否かを容易に判定することが可能となる。尚、この目視検査については、必要に応じて顕微鏡やルーペを用いてかしめ変形部３ａの状態を観察したり、或いは画像処理等によってマーク５が見える領域（部位）を判定するようにしても良い。従ってかしめ変形部３ａの大きさを個々に計測しなくても、そのかしめ状態の良否を簡易に、しかも的確に判定することができるので、その製造品質管理を効率的に実行することが可能となる。
【００２０】
特にこのようなかしめ変形量管理用のマーク５を設けておけば、例えば図３に例示するような小型の流量計（マイクロフローセンサ）を製作する場合等に多大な効果を奏する。ちなみに図３に示する流量計は、６.５ｍｍ×８.５ｍｍ×０.７ｍｍなる大きさの、例えばセラミック製またはガラスエポキシ製等からなるプリント基板（第１部品）１１上に熱流量センサ１２を搭載し、この熱流量センサ１２の上部を覆って前記プリント基板１１の表面に所定の流体流路を形成する合成樹脂製の６.５ｍｍ×７.０ｍｍ×２.５ｍｍなる外形寸法を有する樋状のカバー体（第２部品）１３を一体に設けた構造を有する。そしてその結合は、カバー体１３の底面に突設した直径０.８ｍｍのボス１４を前記プリント基板１１に設けた貫通孔１５に嵌め込み、プリント基板１１の裏面側において前記ボス１４の頭部をかしめ変形させることによってなされる。
【００２１】
この場合、プリント基板１１の裏面からのかしめ変形部の最大突出高さｈが、例えば０.８ｍｍ以下である等の制約があることから、上述した直径０.８ｍｍのボス１４の頭部の加熱溶融によるかしめ作業には細心の注意が必要となる。また製作した流量計の品質を検査する場合にも、プリント基板１１とカバー体１３とが確実に一体化されているか否かを判定することが重要となる。この点、上述したマーク５をプリント基板１１に設けておけば、そのかしめ作業と品質検査を容易に、しかも的確に行うことが可能となる。従って図３に示すような小型の流量計に代表されるようなチップ部品を製作する上で、上述したマーク５が果たす効果は絶大であり、その実用的利点が極めて大きい。
【００２２】
尚、本発明は上述した実施形態に限定されるものではない。例えばマーク５としては前述した円環状のパターンに限られず、図４に例示するようなものであっても良い。図４(ａ)に示すものは、貫通孔１の周囲に該貫通孔１の軸心を通って互いに直行する２つの方向に前述した円環状のパターンの一部をなすマーク５ｍを部分的に設けたものである。このように部分的に設けたマーク５ｍであっても、基本的にはかしめ変形部３ａの位置ずれの向きを判定しながら、その大きさを判定することができるので先の実施形態と同様な効果が奏せられる。また図４(ｂ)に示すものは、前述した円環状のマーク５の幅に相当する直径の複数の円形マークｎを、かしめ変形部３ａの大きさＤに相当する径に沿って円形に並べたものである。従ってこのような形状のマーク５ｎであっても先の実施形態と同様な効果が奏せられる。
【００２３】
更に図４(ｃ)に示すものは、前述した円環状のマーク５の内周縁および外周縁にそれぞれ相当する２本の細線５ｘ,５ｙを円形に同軸に設けたものである。この場合には細線５ｘ,５ｙがそれぞれ見えるか否かによってかしめ変形部３ａの良否を判定することが可能となる。このようにマーク５（５ｍ,５ｎ,５ｘ,５ｙ）としては、かしめ変形部３ａの適正な大きさＤを判定する上で必要な許容幅の下で、その最小径Ｄ１と最大径Ｄ２とを視覚的に容易に判定し得る第１の部位５ａと第２の部位５ｂとをそれぞれ備えたものであれば良いので、そのパターン形状については特に限定されない。また前述した２本の細線５ｘ,５ｙの色を異ならせておくことも有用である。
【００２４】
またかしめ対象とする第１部品については、金属やその他の合成樹脂であっても良い。またかしめ対象とする部品の種類についても特に限定されないことは言うまでもなく、部品の大きさやボス・貫通孔の大きさ等についても限定されない。要は本発明はその要旨を逸脱しない範囲で種々変形して実施することができる。
【００２５】
【発明の効果】
以上説明したように本発明によれば、ボスの頭部を加熱溶融させてかしめられる貫通孔の周囲に、適正なかしめ変形部によって覆い隠される第１の部位、また過剰なかしめ変形部によって覆い隠される第２の部位を備えたマークを設けておくだけで、そのかしめ変形量を容易に、しかも適切に管理することができる。従って各種かしめ結合部品を製作する上で実用的利点が多大である。
【図面の簡単な説明】
【図１】本発明の一実施形態に係るかしめ結合部品の概要を示す図。
【図２】かしめ結合部品のかしめ状態と、かしめ変形部によるマークの見え方を示す図。
【図３】かしめ結合部品の具体例を示す図。
【図４】マークの変形例を示す図。
【符号の説明】
１ 貫通孔
２ 第１部品
３ ボス
４ 第２部品
５,５ｍ,５ｎ,５ｘ,５ｙ マーク
５ａ 第１の部位（内周縁）
５ｂ 第２の部位（外周縁）[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the head of a synthetic resin boss of the second part that is passed through the through hole of the first part is heated and melted and deformed, and the first part and the second part are integrated by caulking the through hole. The present invention relates to a caulking joint part to be joined.
[0002]
[Related background]
One of the methods for integrating the two parts is to heat and press the head of the synthetic resin boss of the second part that is passed through the through hole of the first part to melt and deform the melt deformed part and There is a technique for caulking the first part between the base of the boss. Specifically, when attaching a protective cover that covers the electronic component to the surface of the circuit board on which the electronic component is mounted, pins (bosses) that protrude from the four corners of the synthetic resin protective cover are drilled in the circuit board. Is inserted into the pin hole (through hole), and a heating body is pressed against the head of the pin on the back surface of the circuit board to deform the head of the pin into a flat shape, thereby fixing the protective cover integrally on the circuit board. A technique is known (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-167668 [0004]
[Problems to be solved by the invention]
By the way, when the object to be integrated is a small part of about 5 mm square, for example, the pin (boss) itself becomes a thin one with a diameter of about 1 mm, and when the head portion of this pin is heated and melted to cause caulking deformation, the caulking deformation portion It cannot be denied that itself is also small. In order to sufficiently secure the caulking coupling strength, it is necessary to caulk and deform the head of the pin (boss) around the pin hole (through hole) by a predetermined spread amount.
[0005]
However, in order to perform such caulking with high accuracy, it is necessary to perform caulking work while confirming the caulking deformation amount (melt deformation amount) using, for example, a microscope or a magnifying glass, and the working efficiency is very poor. By the way, when the caulking accuracy is low, specifically when the amount of deformation by caulking is small, the pin (boss) may fall out of the pin hole (through hole) due to a slight external force, and the amount of deformation is small. The protruding length of the pin (boss) on the back side may be too high. Conversely, when the amount of caulking deformation is excessive, the deformed portion of the head of the pin (boss) becomes too thin and the caulking strength is insufficient. As a result, the caulking deformed portion is damaged by receiving a slight external force, and the pin (boss) that has lost the deformed portion may fall out of the pin hole (through hole).
[0006]
The present invention has been made in consideration of such circumstances, and its purpose is to heat-deform the head of a synthetic resin pin (boss) in a small part and to crimp it to another part. It is another object of the present invention to provide a caulking joint component that can adjust the caulking deformation amount with high accuracy and can easily check the quality of the caulking deformation amount.
[0007]
In particular, the present invention includes a component suitable for caulking and joining, for example, a printed circuit board and a synthetic resin cover body of a flow sensor realized as a small part of about 5 mm square for measuring a minute flow rate, for example. The object is to provide a caulking joint.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, a caulking joint component according to the present invention is made of a synthetic resin projecting from a second component (for example, a cover body) through a through hole opened in a first component (for example, a substrate). A boss is fitted, the head of the boss protruding from the through hole is heated and melted and deformed around the through hole, and the first part and the second part are integrally coupled,
Around the through-hole of the first component , at least a first part that is covered with the melt-deformation part at the time of proper melt-deformation of the boss for visually observing the amount of melt-deformation of the head of the boss; A mark having a second part that is covered with the melt-deformed part when the boss is excessively deformed is provided.
[0009]
Preferably, the mark is formed of an annular pattern having a predetermined width provided around the through-hole, and has an inner peripheral edge as the first portion and an outer peripheral edge as the second portion.
[0010]
If such a mark is provided, the head portion of the boss is heated and melted and deformed until the first part (inner peripheral edge) of the mark is hidden, and the second part (outer peripheral edge) of the mark becomes invisible. The heating / melting deformation amount (caulking deformation amount) can be optimized only by stopping the heating / melting deformation of the boss head. Therefore, the heat deformation work (caulking work) of the head of the boss can be facilitated. Further, when inspecting the caulking and joining parts (chip parts), it is possible to easily determine whether or not the parts are good by simply examining whether or not the first and second parts of the mark are visible. Therefore, it is possible to improve the work efficiency and inspection efficiency and easily select only highly reliable parts.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a caulking joint component according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the caulking joint component includes a first part 2 having a caulking through hole 1 and a second part 4 having a caulking rod-like boss (pin) 3. . Then, the boss 3 is fitted into the through-hole 1, and the head (tip) of the boss 3 protruding through the through-hole 1 is heated and pressurized with a heating element (not shown) to surround the through-hole 1. By melting and deforming, the first part is sandwiched (caulked) between the melt-deformed portion and the surface of the second part 4.
[0012]
Incidentally, the through hole 1 is formed as a round hole having an inner diameter d. The boss 3 is formed as a round bar whose outer diameter is slightly smaller than the inner diameter of the through hole 1 and longer than the thickness t of the first component 2 by a predetermined length. The length of the boss 3 is the amount of caulking deformation (melt deformation) of the head, specifically, the size (diameter; D) and the height of the caulking deformation portion 3a as shown in FIG. It is set according to (h).
[0013]
Now, in such a caulking joint component, the present invention is characterized in that a mark 5 for visually observing the amount of melt deformation of the boss 3 around the through hole 1 on the surface of the first component 2 as shown in FIG. It is in the point which provided. The mark 5 is formed of, for example, an annular pattern having a predetermined width provided coaxially with the through-hole 1, and the inner periphery thereof is covered with a caulking deformation portion 3a when at least the boss 3 is appropriately melted and deformed. 1 part 5a, and when the boss 3 is excessively melted and deformed, the second part 5b is covered with the caulking deformed portion 3a.
[0014]
Specifically, when the size of the caulking deformed portion 3a becomes the diameter D, when the height is h and a desired caulking strength is ensured, the mark 5 made of the annular pattern is The diameter D1 of the inner peripheral edge (first part 5a) and the diameter D2 of the outer peripheral edge (second part 5b) are set to satisfy [D1 <D <D2]. The mark 5 may be printed on the surface of the first component 2 or may be a metal film deposited. It is also possible to form the mark 5 by machining the surface of the first part 2 into a concave or convex shape by etching or the like, or processing the surface of the first component 2 in a satin shape.
[0015]
According to the caulking joint component having such a mark 5, when the caulking deformed portion 3 a is formed around the through hole 1 by heating and melting the head of the boss 3, the first portion (inner edge portion) of the mark 5 is formed. 2) If the heating and melting operation (caulking operation) is stopped in a state where 5a is covered with the caulking deformable portion 3a and cannot be seen, and the second portion (outer edge portion) 5b of the mark 5 is visible, this causes FIG. It is possible to form the proper caulking deformable portion 3a that can sufficiently secure the mechanical strength as shown in FIG.
[0016]
Incidentally, when the caulking deformed portion 3a is formed in a state of being deviated from its axis as shown in FIG. 2B, a part of the second portion (outer edge portion) 5b of the mark 5 is caulked. It is covered with the deformable portion 3a and cannot be seen. This state is a so-called cantilever caulking state, which is a caulking failure. Accordingly, since the entire second portion (outer edge portion) 5b cannot be visually recognized, it can be excluded as a defective product.
[0017]
Further, when the head of the boss 3 is excessively heated and melted and deformed, the caulking deformed portion 3a expands in the horizontal direction as shown in FIG. 2 (c) to increase its diameter, and its thickness also decreases. Then, since the first part (inner edge part) 5a and the second part (outer edge part) 5b of the mark 5 are both covered with the caulking deformation part 3a and cannot be seen, it is determined that the caulking is defective in this state. It becomes possible.
[0018]
Although not particularly illustrated, when the amount of heat melting deformation (caulking amount) of the head of the boss 3 is insufficient, not only the second part (outer edge part) 5b in the mark 5 but also the first part (inner edge). Part) 5a is not covered with the caulking deformation part 3a. Accordingly, since the first part (inner edge part) 5a and the second part (outer edge part) 5b of the caulking mark 5 can be seen together, this state is determined before caulking or as insufficient caulking (caulking failure). Is possible.
[0019]
Therefore, by determining whether or not the first part (inner edge part) 5a and the second part (outer edge part) 5b of the mark 5 are visible (can be visually recognized), the head of the boss 3 is deformed by caulking deformation. It becomes possible to easily determine whether or not the first component 2 and the second component 4 are properly coupled and integrated. In addition, about this visual inspection, you may make it determine the area | region (part | part) where the mark 5 is visible by observing the state of the crimping deformation part 3a using a microscope or a loupe as necessary, or by image processing or the like. . Therefore, the quality of the caulking state can be easily and accurately determined without measuring the size of the caulking deformation portion 3a individually, and thus the manufacturing quality control can be efficiently executed. Become.
[0020]
In particular, if such a caulking deformation amount management mark 5 is provided, for example, when a small flow meter (micro flow sensor) as illustrated in FIG. Incidentally, the flow meter shown in FIG. 3 has a heat flow sensor 12 on a printed circuit board (first component) 11 having a size of 6.5 mm × 8.5 mm × 0.7 mm made of, for example, ceramic or glass epoxy. And has an outer dimension of 6.5 mm × 7.0 mm × 2.5 mm made of synthetic resin that covers the upper part of the heat flow sensor 12 and forms a predetermined fluid flow path on the surface of the printed circuit board 11. The cover body (second component) 13 is integrally provided. And the coupling | bonding fits the boss | hub 14 of diameter 0.8mm protrudingly provided in the bottom face of the cover body 13 in the through-hole 15 provided in the said printed circuit board 11, and crimps the head of the said boss | hub 14 in the back surface side of the printed circuit board 11. Made by deforming.
[0021]
In this case, since the maximum protrusion height h of the caulking deformed portion from the back surface of the printed circuit board 11 is, for example, 0.8 mm or less, the heating of the head of the boss 14 having a diameter of 0.8 mm described above is performed. Careful attention is required for the caulking work by melting. Also, when inspecting the quality of the manufactured flow meter, it is important to determine whether the printed circuit board 11 and the cover body 13 are integrated with each other. In this regard, if the mark 5 described above is provided on the printed circuit board 11, the caulking operation and the quality inspection can be easily and accurately performed. Therefore, in producing a chip part typified by a small flow meter as shown in FIG. 3, the effect of the above-described mark 5 is enormous, and its practical advantage is extremely great.
[0022]
The present invention is not limited to the embodiment described above. For example, the mark 5 is not limited to the annular pattern described above, and may be the one illustrated in FIG. In FIG. 4 (a), the mark 5m forming a part of the above-described annular pattern is partially formed around the through-hole 1 in two directions perpendicular to each other through the axis of the through-hole 1. It is provided. Even in the case of the mark 5m partially provided in this way, the size of the mark 5m can be determined while basically determining the direction of the displacement of the caulking deformation portion 3a. An effect is produced. 4B, a plurality of circular marks n having a diameter corresponding to the width of the annular mark 5 described above are arranged in a circle along a diameter corresponding to the size D of the caulking deformation portion 3a. It is a thing. Therefore, even with the mark 5n having such a shape, the same effect as in the previous embodiment can be obtained.
[0023]
Further, what is shown in FIG. 4 (c) is one in which two thin wires 5x and 5y corresponding to the inner and outer peripheral edges of the above-mentioned annular mark 5 are provided coaxially in a circle. In this case, it is possible to determine whether the caulking deformed portion 3a is good or not based on whether the thin lines 5x and 5y are visible. As described above, the mark 5 (5m, 5n, 5x, 5y) has a minimum diameter D1 and a maximum diameter D2 within an allowable width necessary for determining an appropriate size D of the caulking deformation portion 3a. Since the first part 5a and the second part 5b that can be easily visually determined are provided, the pattern shape is not particularly limited. It is also useful to make the two thin lines 5x and 5y different in color.
[0024]
Further, the first component to be caulked may be a metal or other synthetic resin. Further, it goes without saying that the type of parts to be caulked is not particularly limited, and the size of the parts and the size of the boss / through hole are not limited. In short, the present invention can be implemented with various modifications without departing from the gist thereof.
[0025]
【The invention's effect】
As described above, according to the present invention, the first portion that is covered by an appropriate caulking deformation portion and the excess caulking deformation portion are covered around the through hole that is caulked by heating and melting the boss head. By simply providing a mark having a second portion to be hidden, the amount of caulking deformation can be easily and appropriately managed. Therefore, there are great practical advantages in producing various types of caulking joint parts.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a caulking joint component according to an embodiment of the present invention.
FIG. 2 is a diagram showing a caulking state of a caulking joint component and how a mark is seen by a caulking deformation portion.
FIG. 3 is a diagram showing a specific example of a caulking joint component.
FIG. 4 is a view showing a modified example of a mark.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Through-hole 2 1st part 3 Boss 4 2nd part 5,5m, 5n, 5x, 5y Mark 5a 1st site | part (inner periphery)
5b 2nd part (outer periphery)

Claims (1)

第１部品に開口された貫通孔を挿通させて第２部品に突設された合成樹脂製のボスを嵌め込み、上記貫通孔から突出した前記ボスの頭部を加熱して前記貫通孔の周囲に溶融変形させて前記第１部品と第２部品とを一体に結合するかしめ結合部品であって、
前記第１部品の前記貫通孔の周囲に、前記ボスの溶融変形量を目視するための少なくとも前記ボスが適正に溶融変形したときにその溶融変形部位にて覆われる第１の部位と、前記ボスが過度に溶融変形したときにその溶融変形部位にて覆われる第２の部位とを有するマークを設けたことを特徴とするかしめ結合部品。A through hole opened in the first part is inserted, a synthetic resin boss projecting from the second part is fitted, and the head of the boss protruding from the through hole is heated to surround the through hole. A caulking joint part that melts and deforms and integrally joins the first part and the second part,
Around the through-hole of the first part, at least a first portion that is covered with the melt-deformed portion when at least the boss is appropriately melt-deformed for visually checking the amount of melt deformation of the boss, and the boss And a second part that is covered with the melt-deformed part when the metal is excessively melt-deformed .
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JP4721789B2 (en) * 2005-06-30 2011-07-13 日本プラスト株式会社 Resin parts positioning structure
JP2007212657A (en) * 2006-02-08 2007-08-23 Fujinon Corp Lens holder
DE102006039621A1 (en) * 2006-08-24 2008-02-28 Porextherm-Dämmstoffe Gmbh Vacuum insulation panel with bushing
JP4831685B2 (en) * 2006-11-24 2011-12-07 日本アビオニクス株式会社 Repair method for heat caulking
JP4862922B2 (en) * 2009-07-10 2012-01-25 パナソニック電工株式会社 Bonding structure of resin parts
JP2012134400A (en) * 2010-12-23 2012-07-12 Denso Corp Circuit board
KR101488479B1 (en) * 2013-07-26 2015-01-30 존슨콘트롤즈 오토모티브 인테리어 코리아 주식회사 Fusion welding structure of components in vehicle

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