JP4576708B2 - In-mold foam molding equipment - Google Patents

In-mold foam molding equipment Download PDF

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Publication number
JP4576708B2
JP4576708B2 JP2000374872A JP2000374872A JP4576708B2 JP 4576708 B2 JP4576708 B2 JP 4576708B2 JP 2000374872 A JP2000374872 A JP 2000374872A JP 2000374872 A JP2000374872 A JP 2000374872A JP 4576708 B2 JP4576708 B2 JP 4576708B2
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mold
partition member
molding
raw material
movable partition
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JP2002172642A (en
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喜幸 小林
雅浩 近田
健二 山口
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Kaneka Corp
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Kaneka Corp
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【０００１】
【発明の属する技術分野】
本発明は、１つの成形品に異なる特性の原料ビーズからなる成形部分を形成するのに好適な型内発泡成形装置に関する。
【０００２】
【従来の技術】
熱可塑性合成樹脂からなる原料ビーズを用いて成形品を製作する型内発泡成形装置として、例えば米国特許５１６４２５７号公報には、一方の金型にエアシリンダー等のアクチュエータを介して成形空間内に出没自在な仕切部材を設け、この仕切部材により成形空間内を複数の区画成形空間に区画するとともに、各区画成形空間に対して原料ビーズを供給する充填器を個別に接続し、仕切部材により成形空間内を区画した状態で、隣接する区画成形空間内に、例えば発泡倍率の異なる原料ビーズを充填し、充填後、仕切部材を後退させてから成形空間内に蒸気を供給することで、原料ビーズを加熱融着させて成形品を得るように構成した型内発泡成形技術が記載されている。
【０００３】
この型内発泡成形技術により成形された成形品においては、成形品の部位によって使用する原料ビーズを変更することで、例えば部位によって機械的特性が異なる成形品を製作することが可能で、成形品の性能や品質を向上できる利点を有しており、自動車用バンパーの芯材や、家電製品や家具等の梱包用のクッション材として採用されつつある。
【０００４】
【発明が解決しようとする課題】
前記米国公報に記載の成形装置においては、仕切部材を出没させるためのアクチュエータを設ける必要があるので、成形空間の区画個数が増えると、それに応じて仕切部材の駆動系統が複雑になり、成形装置の製作コストが高くなるという問題がある。
また、隣接する区画成形空間内の充填圧に差圧が生じないように制御しないと、差圧による仕切部材の変形が懸念される。また、充填用エアの流れが仕切部材により阻害されて原料ビーズの充填性が低下するという問題もある。
【０００５】
更に、この成形装置においては、金型に挿通孔を形成して、この挿通孔に仕切部材を出没自在に装着する関係上、成形品の表面に挿通孔に沿ってバリが形成されるという問題がある。即ち、仕切部材の前端部の形状は、相手方の金型の内面形状に沿った形状に形成されているが、必ずしも挿通孔を設けた金型の内面と同じ形状であるわけではないので、原料ビーズの充填後、仕切部材を後退させたときに、仕切部材の一部は挿通孔の奧部側まで没入し、挿通孔の内部空間が成形空間に開口した状態になることがある。もっとも、挿通孔の開口幅は、原料ビーズの直径よりも小さく設定され、挿通孔内に原料ビーズが侵入しないように構成されているので、仕切部材を後退させただけでは原料ビーズが挿通孔内に侵入することはないが、成形空間内に蒸気を供給して原料ビーズを加熱融着させたときに、原料ビーズが軟化して発泡することにより、原料ビーズの一部が挿通孔内に侵入して、成形品の挿通孔に対応する位置に沿った細長いバリが突出状に形成される。
【０００６】
このようなバリは、表面の寸法精度に対する要求がラフな成形品に関しては大きな問題になることはないが、要求の厳しい成形品においては製品欠陥となることがある。例えば、自動車用バンパーにおいては、自動車のフロントビームの前側に型内発泡成形品としての芯材を固定し、この芯材を覆うように合成樹脂製のカバー部材を配置させたものが広く採用されているが、このような自動車用バンパーにおいては、芯材とフロントビーム間や芯材とカバー部材間に隙間が形成され、フロントビームの取付面の適正な位置に芯材を固定できなくなったり、車体の適正な位置にカバー部材を固定できなくなるという不具合が発生するので、これを防止するため芯材の成形後にバリを除去する必要があった。
【０００７】
本発明の目的は、１つの成形品に異なる特性の原料ビーズからなる成形部分を成形可能で、しかも異なる特性の成形部の境界におけるバリの発生を防止し得る型内発泡成形装置を提供することである。
【０００８】
【課題を解決するための手段及びその作用】
本発明に係る第１の型内発泡成形装置は、第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に形成するとともに、可動仕切部材の先端部に、隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけて型開閉方向に片持ち状に延びる複数の櫛歯を設け、これら複数の櫛歯の先端が第１金型に組み合わされる第２金型の成形面に適合した形状となるように形成し、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着するものである。
【０００９】
この第１の成形装置においては、可動仕切部材を櫛歯とともに成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画し、この状態で隣接する区画成形空間内に異なる特性の原料ビーズをそれぞれ充填することになる。このため、区画成形空間の形成位置やサイズ、充填する原料ビーズの特性などを適正に設定することで、成形品の性能や品質を向上できる。例えば、強度面を重視する部位には、発泡倍率の低い原料ビーズを用いて成形品の強度剛性を高め、そうでない部位には発泡倍率の高い原料ビーズを用いることで成形品重量を軽減し、成形品の強度アップと重量軽減の両立を図ることが可能となる。
【００１０】
また、原料ビーズを充填した後、可動仕切部材を後退させて成形空間内へ蒸気を供給し、原料ビーズを加熱融着させることになるが、このとき可動仕切部材をその先端部が第１金型の成形面に面一になるように、つまり第１金型に形成した可動仕切部材の挿通孔が可動仕切部材の先端部で閉鎖されるように可動仕切部材を後退させることで、原料ビーズの加熱融着時に挿通孔に対して原料ビーズが侵入することを防止して、挿通孔を設けた位置にバリが発生することを効果的に防止できる。
【００１１】
更に、この第１の成形装置では、櫛歯による区画部分においては空気や蒸気等の流体の出入りが可能なので、可動仕切部材のみで区画成形空間を区画する場合と比較して、原料ビーズの充填時には隣接する区画成形空間における充填用エアの流れを確保することが可能となり、また原料ビーズの加熱融着時には、蒸気の円滑な流れを阻害することを極力防止して、成形品の品質を向上できる。しかも、成形品には、櫛歯に対応する位置に有底孔が形成されるが、隣接する有底孔間では原料ビーズが密着した状態となるので、成形品の強度低下も防止できる。
【００１２】
本発明に係る第２の型内発泡成形装置は、第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に構成し、第１金型に組み合わされる第２金型に、可動仕切部材を突出させた状態で、可動仕切部材と第２金型の成形面間における原料ビーズの通り抜けを規制する櫛歯を、可動仕切部材に対面させ且つ隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけて、型開閉方向に片持ち状に複数設け、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着するものである。
【００１３】
この第２の型内発泡成形装置においては、第１の型内発泡成形装置と基本的に同じ作用が得られるが、第１の型内発泡成形装置では、櫛歯の先端を第２金型の成形面に適合する形状に設定する必要があるのに対し、第２の型内発泡成形装置では、櫛歯の先端部は、可動仕切部材の先端部の形状に適合させてもよいが、可動仕切部材の先端部に重なるように設定することで、原料ビーズの移動を阻止できるので、櫛歯の長さを格段にラフに設定することが可能となる。
【００１４】
本発明に係る第３の型内発泡成形装置は、第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に構成し、可動仕切部材の先端部と第１金型に組み合わされる第２金型とに、第２金型の成形面と可動仕切部材間における原料ビーズの通り抜けを規制する櫛歯を、隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけ、先端部を相互にラップさせて型開閉方向に片持ち状に複数設け、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着するものである。
【００１５】
この第３の型内発泡成形装置においては、第１の型内発泡成形装置と基本的に同じ作用が得られるが、第１の型内発泡成形装置では、櫛歯の先端を第２金型の成形面に適合する形状に設定する必要があるのに対し、第３の型内発泡成形装置では、櫛歯の先端部が相互に重なるように設定することで、原料ビーズの移動を阻止できるので、櫛歯の長さを格段にラフに設定することが可能となる。しかも、櫛歯として短尺なものを採用できるので、成形品の離型性を向上できるとともに、櫛歯に作用する曲げモーメントを小さく設定できるので、櫛歯として小径のものを採用することが可能となり、櫛歯により成形品に形成される有底孔を極力小径に構成できる。また、成形品の離型時に、櫛歯の引き抜き力をバランス良く成形品に作用させることが可能となり、成形品の離型性を向上できるとともに、離型時における成形品の破損を防止できる。
【００１６】
ここで、前記櫛歯を弾性変形可能な素材で構成することが好ましい。つまり、櫛歯は、充填圧や発泡圧等を受けて変形することを防止するため、その断面積を大きく設定して強度剛性を高めることが好ましいが、このように構成すると、成形品に大きな孔が形成されることになり、成形品の外観低下や強度低下の原因となる。そこで、櫛歯を弾性変形可能な素材で構成することにより、充填圧や発泡圧により櫛歯が多少変形しても元の形状に復帰できるようにして、櫛歯の塑性変形による成形不良を防止しつつ、櫛歯の断面積を極力小さく設定して、成形品の外観低下や強度低下を抑制できるように構成することが好ましい。
【００１７】
成形品の離型性を向上するため、エジェクタピンを有する金型に櫛歯を設けることが好ましい。つまり、金型形状によっては、型開きしたときに、成形品がエジェクタピンを有しない金型側に残置されて、離型不良が発生することがあるが、この成形装置においては、櫛歯が成形品に密着した状態で金型が型開きされるので、型開きしたとき成形品は、櫛歯を設けた金型側に残置されようとする。このため、エジェクタピンを有する金型に櫛歯を設けることで、前述のような離型不良を効果的に防止することが可能となる。
【００２２】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。尚、本実施の形態は、型内発泡成形品としての自動車用バンパーの芯材を成形する型内発泡成形装置に本発明を適用した場合のものである。
【００２３】
先ず、型内発泡成形品としての自動車用バンパーの芯材について説明する。
図１、図２に示すように、芯材１は、両端部側を緩やかに後方へ湾曲させた前部衝撃吸収部２と、前部衝撃吸収部２の両端部から後方へ延びる側部衝撃吸収部３とを有している。前部衝撃吸収部２から側部衝撃吸収部３に至る角部４の下半部には発泡倍率の低い原料ビーズからなる低発泡部５が形成され、その他の部分は低発泡部５よりも発泡倍率の高い原料ビーズからなる高発泡部６で構成されている。
【００２４】
つまり、前部衝撃吸収部２の中央部は、正突時における衝撃エネルギーを吸収するためのものであるが、衝撃エネルギーの受圧面積を大きく設定できるので、発泡倍率の高い軟質軽量な原料ビーズで構成し、前部衝撃吸収部２の両端部及び側部衝撃吸収部３は、オフセット衝突時や斜突時における衝撃エネルギーを吸収するためのものであるが、衝撃エネルギーの受圧面積を大きく設定することが困難なので、他の部分よりも重たくなるが発泡倍率の低い硬質な原料ビーズからなる低発泡部５を設けることで、各種前面衝突時における十分な衝突安全性能を確保しつつ、芯材１の重量を極力低減できるように構成されている。尚、低発泡部５のサイズは、芯材１に作用する衝撃エネルギーを十分に吸収できるように構成されていれば、任意に設定することが可能である。また、本実施例では、低発泡部５を芯材１の角部４の下半部にのみ形成したが、低発泡部５の形成位置は、衝突安全性を十分に確保できる位置であれば任意に設定可能で、例えば角部４の全体を低発泡部５で構成することも可能である。また、芯材１の外観形状やサイズは、適用する自動車に応じて任意に設定可能である。
【００２５】
図１に示すように、低発泡部５と高発泡部６とは正面視略コ字状の境界Ｌの位置において区画され、芯材１の後部には境界Ｌに沿って一定間隔おきに前後方向に延びる有底孔７が形成され、芯材１の下部には境界Ｌに沿って前後方向に延びる１対のスリット８がそれぞれ形成されている。また、この芯材１は、後述する型内発泡成形装置１０を用いて成形することにより、従来の成形品のように低発泡部５と高発泡部６との境界Ｌにバリが突出形成されるという不具合を防止できるので、成形した芯材１をバリ除去のための煩雑な工程を経ることなく、自動車のフロントビームの取付面に精度よく固定したり、カバー部材を隙間なく外装したりすることが可能となる。
【００２６】
尚、境界Ｌは必ずしも正面視コ字状に形成する必要はなく、低発泡部５の形状やサイズ、形成位置などに応じて、正面視Ｌ字状や直線状、或いは曲線状に形成することも可能である。また、本実施例では、自動車用バンパーの芯材１について説明したが、異なる特性の原料ビーズからなる成形部を有する成形品であれば、芯材１以外の型内発泡成形品に対しても本発明を同様に適用できる。更に、成形品によっては、その使用条件に適合するように、発泡倍率以外の特性の異なる原料ビーズ、例えばビーズ嵩密度、セル径、ビーズ径、素材などの異なる特性の原料ビーズを用いて成形品を構成してもよい。
【００２７】
原料ビーズの素材としては、製作する成形品の使用条件などに応じた物性の素材を選択することになるが、ポリスチレン系合成樹脂材料や、ポリエチレン系樹脂やポリプロピレン系樹脂材料などのポリオレフィン系合成樹脂材料や、これらの合成樹脂材料の共重合体などを採用できる。
原料ビーズの発泡倍率は、原料ビーズの素材にもよるが、３〜１５０倍の範囲内が好ましい。具体的には、ポリスチレン系合成樹脂材料からなる原料ビーズにおいては３〜１００倍、好ましくは３〜８０倍、ポリオレフィン系合成樹脂材料からなる原料ビーズにおいては、３〜９０倍、好ましくは３〜６０倍のものが好適に利用できる。また、粒径は１〜１０ｍｍ、好ましくは２．０〜８ｍｍの範囲のものが好適に利用できる。
【００２８】
ポリオレフィン系樹脂材料の具体例としては、エチレンプロピレンランダムポリプロピレン樹脂、エチレンプロピレンブロックポリプロピレン樹脂、ホモポリプロピレンエチレンプロピレンブテンランダムターポリマー、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、架橋低密度ポリエチレン（架橋ＬＤＰＥ）などを好適に利用できる。
【００２９】
このようなポリオレフィン系樹脂材料からなる原料ビーズのセル径は、１００μｍ未満の場合には、成形時に表面伸びが悪く、ヒケ易く、適正表面外観の見栄えが劣るという問題があり、９００μｍを越える場合には、セル径が不均一になり易く、セル径が大きいため表面のきめが粗く、適正表面外観が劣るという問題があるので、１００〜９００μｍの範囲内、より好ましくは１５０〜７００μｍ、特に好ましくは１７０〜５５０μｍに設定することになる。
【００３０】
ＤＳＣ２’ｎｄピーク比は、８％〜６０％に設定することが好ましい。ＤＳＣ２’ｎｄピーク比とは、基材樹脂を加熱したときに、基材樹脂の結晶融点に起因して形成される、低温側と高温側の２つのＤＳＣ（示差走査熱量測定）のピークの合計面積に対する高温側ピークの面積の割合であり、このＤＳＣ２’ｎｄピーク比が、８％未満の場合には、成形時の加熱条件幅が狭く、成形体が収縮し易く、ヒケ易い。また、６０％を越えると、加熱条件を大幅にアップする必要があり、成形機の大型化が必要であり、且つ省エネルギーという観点からもマイナスとなるので８〜６０％、より好ましくは１０〜５０％、特に好ましくは１５〜４０％に設定することになる。
【００３１】
独立気泡率は、６５％未満の場合には、成形時の加熱圧をアップしてなんとかビーズ同士を融着させたとしても、成形体の収縮、ヒケが大きくなり易く、目標の品質の成形体が得られ難くなるので、６５％以上、より好ましくは７５％以上、特に好ましくは８５％以上に設定することになる。
【００３２】
次に、前述した芯材１を成形可能な型内発泡成形装置１０について説明する。
図３に示すように、型内発泡成形装置１０は、対向配置した１組の金型としてのコア型１１及びキャビティ型１２と、コア型１１とキャビティ型１２とで形成される成形空間１３内を複数の区画成形空間１３Ａ，１３Ｂに区画する区画手段３０と、各区画成形空間１３Ａ，１３Ｂに異なる特性の原料ビーズを空気の流れに乗せて充填する充填器１４とを備えている。尚、コア型１１が第１金型に相当し、キャビティ型１２が第２金型に相当する。
【００３３】
コア型１１及びキャビティ型１２は、枠状フレームと裏板とを有するハウジング１５にそれぞれ取り付けられ、コア型１１及びキャビティ型１２の背面側には１組の第１チャンバー１６及び第２チャンバー１７がそれぞれ形成され、コア型１１及びキャビティ型１２には両チャンバー１６，１７と成形空間１３とを連通する多数の通気孔１８が形成されている。尚、通気孔１８は、実際には、図４、図５に例示するように、０．５ｍｍφ程度の丸孔１９ａや幅０．５ｍｍ程度のスリット１９ｂを複数個透設した外径７〜１２ｍｍの蓋を有する筒体からなるコアベント１９を、金型１１，１２に孔明け配置したコアベント取付孔２０に嵌め込んで形成したものや、金型１１，１２に直接的に形成した０．５ｍｍφ程度のコアベントホール２１で構成されている。
【００３４】
第１チャンバー１６及び第２チャンバー１７には、蒸気や圧縮空気などの用役流体を供給するための供給管２２がそれぞれ接続されるとともに、減圧手段やドレン配管に連なる排出管２３がそれぞれ接続され、図示外のバルブ操作により、第１チャンバー１６及び第２チャンバー１７に対する蒸気や圧縮空気などの用役流体の供給や排出をそれぞれ個別に制御できるように構成されている。
【００３５】
図３、図６に示すように、型内発泡成形装置１０には芯材１の低発泡部５に対応させて２組の区画手段３０が設けられ、成形空間１３内は、これら２組の区画手段３０により、低発泡部５を成形するための２つの区画成形空間１３Ａ，１３Ｂと、高発泡部６を成形するための１つの区画成形空間１３Ａ，１３Ｂとに区画可能に構成されている。各区画成形空間１３Ａ，１３Ｂには原料ビーズの充填器１４がそれぞれ接続されており、隣接する区画成形空間１３Ａ，１３Ｂ内に異なる特性の原料ビーズを充填できるように構成されている。尚、本実施例では自動車用バンパーの芯材１を成形すべく、成形空間１３を３つに区画したが、成形空間１３の区画形状や区画個数や区画位置は、製作する成形品に応じて任意に設定可能である。また、充填器１４はコア型１１側に設けてもよいし、キャビティ型１２側に設けてもよいが、金型構造が複雑になることを防止するため、後述する可動仕切部材３１とは反対側の金型に配置することが好ましい。更に、発泡倍率の異なる原料ビーズを隣接する区画成形空間１３Ａ，１３Ｂに充填したが、成形品の用途などに応じて、ビーズ嵩密度、セル径、ビーズ径、素材などの特性の異なる原料ビーズを充填することも可能である。
【００３６】
区画手段３０は、図３、図６、図７に示すように、コア型１１に出没自在に設けた可動仕切部材３１と、可動仕切部材３１を図３に図示の前進位置と図７に図示の後退位置とに進退駆動するエアシリンダー等からなるアクチュエータ３２と、可動仕切部材３１の先端部に設けた複数の櫛歯３３からなる櫛状仕切部材３４と、可動仕切部材３１に連なるようにキャビティ型１２に設けた１対の固定仕切部材３５とを備え、可動仕切部材３１を前進位置へ移動させることにより、隣接する区画成形空間１３Ａ，１３Ｂに充填する原料ビーズの少なくとも一方が通り抜けできないように、可動仕切部材３１と櫛歯３３と固定仕切部材３５とで成形空間１３が複数の区画成形空間１３Ａ，１３Ｂに区画される。
【００３７】
コア型１１に対して可動仕切部材３１を出没自在に設けるため、コア型１１のうちの低発泡部５と高発泡部６との境界Ｌには可動仕切部材３１が挿通する正面視略コ字状の挿通孔３６が形成されている。挿通孔３６の開口幅は、原料ビーズのビーズ径よりも小さく設定され、原料ビーズが挿通孔３６内に不用意に侵入することが防止されている。具体的には、原料ビーズの直径の２０〜７０％に設定されている。また、可動仕切部材３１とコア型１１間の隙間は、バリが形成されることを防止するため、極力狭くなるように設定することが好ましく、原料ビーズの発泡倍率により異なるが例えば０．５〜５ｍｍに設定されている。
【００３８】
可動仕切部材３１は、金属材料や合成樹脂材料やセラミックス材料などからなる板状部材で構成され、水平壁３７とその両側端から下側へ延びる鉛直壁３８とで正面視略コ字状に形成されている。可動仕切部材３１の型開閉方向の先端部はコア型１１の成形面に適合する形状に形成され、可動仕切部材３１を後退位置へ移動させた状態において、可動仕切部材３１の先端部はコア型１１の成形面に面一に配置されて挿通孔３６を閉鎖し、挿通孔３６内への原料ビーズの侵入を防止できるように構成されている。可動仕切部材３１の厚さは、原料ビーズの充填圧に耐え得る強度を有していれば、任意の厚さに設定可能であるが、原料ビーズの充填後、可動仕切部材３１を後退させたときに、成形空間１３内の容積がほとんど変化しないように、極力薄く設定することが好ましい。尚、可動仕切部材３１は、平板状の３枚の板材を略コ字状に組み合わせて構成することも可能である。
【００３９】
固定仕切部材３５は、金型形状や成形空間１３の形状等に応じて適宜のサイズや形状に形成される。より具体的には、可動仕切部材３１により物理的に成形空間１３を区画できない部分や、物理的には区画可能ではあるが、可動仕切部材３１で区画すると、可動仕切部材３１の僅かな後退移動により挿通孔３６の奧部側へ移動して、挿通孔３６に沿ってバリが形成されてしまう部分を可動仕切部材に代えてポイント的に区画できるように構成されている。但し、この固定仕切部材３５は必ずしも設ける必要はなく省略することも可能である。
【００４０】
また、固定仕切部材３５の上面には図示していないが可動仕切部材３１の鉛直壁３８の下端縁を型開閉方向に案内するガイド溝が形成され、このガイド溝により鉛直壁３８の下端部を保持することで、原料ビーズの充填圧に対する可動仕切部材３１の強度剛性が高められている。
【００４１】
固定仕切部材３５は、金型と一体的に形成してもよいし、金属材料や合成樹脂材料やセラミックス材料などからなる別部材をボルト等により固定することで金型に設けてもよい。固定仕切部材３５の厚さは、原料ビーズの充填圧に耐え得る強度を有していれば、任意の厚さに設定可能であるが、成形品には固定仕切部材３５により溝部が形成されることから、成形品の強度低下や外観低下を防止するため、極力薄く設定することが好ましい。
【００４２】
可動仕切部材３１の先端部には、区画成形空間１３Ａ，１３Ｂの少なくとも一方に充填する原料ビーズが通り抜けできない間隔Ｔをあけて、型開閉方向に片持ち状に延びる複数の櫛歯３３が設けられている。この間隔Ｔは、狭すぎると、隣接する区画成形空間１３Ａ，１３Ｂ内に充填される原料ビーズ同士の密着性が十分に確保できず、成形品の強度が低下するので、通り抜けできない原料ビーズの直径の３０〜９０％、より好ましくは５０〜８０％に設定することになる。
【００４３】
櫛状仕切部材３４は可動仕切部材３１の先端部から型開閉方向に片持ち状に延びる複数の櫛歯３３で構成され、各櫛歯３３の先端部はキャビティ型１２の成形面に適合する形状に形成され、可動仕切部材３１を前進位置へ移動させた状態で、これら複数の櫛歯３３により、可動仕切部材３１の先端部とキャビティ型１２の成形面間の隙間が閉鎖されるように構成されている。
【００４４】
櫛歯３３は、細長い棒状やパイプ状の部材で構成され、外形は、多角形状や円形状や楕円形状など任意の外形のものを採用できる。また、櫛歯３３の素材は、原料ビーズの充填圧に耐え、しかも原料ビーズの加熱融着時における熱に耐え得る素材であれば、金属材料、合成樹脂材料、セラミックスなどの任意の材料で構成できる。また、この区画手段３０を用いた場合においては、図１、図２に示すように、芯材１には櫛歯３３に対応する位置に有底孔７が形成されることになるので、櫛歯３３の直径は、任意に設定することが可能であるが、極力小さく設定することが好ましく、例えば１〜１０ｍｍ、好ましくは１．５〜５ｍｍに設定されている。更に、櫛歯３３として弾性変形可能な金属材料や合成樹脂材料からなるものを用いることが好ましい。このように構成すると、充填圧や発泡圧により櫛歯３３が多少変形しても元の形状に復帰できるので、櫛歯３３の塑性変形による充填不良や離型不良などの成形不良を防止しつつ、櫛歯３３の断面積を極力小さく設定して、成形品の外観低下や強度低下を抑制できる。
【００４５】
尚、この櫛状仕切部材３４では複数の櫛歯３３を同一平面内に配置し、櫛歯３３により区画される低発泡部５と高発泡部６との境界Ｌを平坦面で構成したが、この境界Ｌが例えば矩形波状や三角波状やサイン波状などの波形面状になるように、櫛歯３３を配置すると、隣接する区画成形空間１３Ａ，１３Ｂ間における原料ビーズの接触面積を増やして、両者の結合強度を向上できるので好ましい。また、低発泡部５と高発泡部６との境界Ｌが正面視略コ字状の場合について説明したが、その他の形状、例えばＬ字状やクランク状や直線状に形成することも可能である。
【００４６】
この区画手段３０では、可動仕切部材３１を前進位置へ移動させた状態で、可動仕切部材３１と櫛歯３３と固定仕切部材３５とで、成形空間１３内が３つの区画成形空間１３Ａ，１３Ｂに区画され、可動仕切部材３１を後退させると、固定仕切部材３５及び櫛歯３３は成形空間１３内に残った状態となるが、その他の部分においては隣接する区画成形空間１３Ａ，１３Ｂ内の原料ビーズ同士が直接的に密着するし、櫛状仕切部材３４においては櫛歯３３間の隙間を介して隣接する区画成形空間１３Ａ，１３Ｂ内の原料ビーズが密着するので、成形品の強度を十分に確保できることになる。しかも、可動仕切部材３１を前進位置へ移動させた状態においても、隣接する区画成形空間１３Ａ，１３Ｂは櫛歯３３間の隙間を介して連通するので、隣接する区画成形空間１３Ａ，１３Ｂの間における充填用エアの流通を確保して、原料ビーズの充填性を向上したり、可動仕切部材３１に対して過大な充填圧が作用することが防止できる。
【００４７】
また、可動仕切部材３１を後退位置へ移動させた状態において、コア型１１に形成した挿通孔３６は可動仕切部材３１の先端部により閉鎖されるので、蒸気による原料ビーズの加熱融着時に、原料ビーズが軟化しても、挿通孔３６内への原料ビーズの侵入は略完全に防止され、挿通孔３６に沿って成形品にバリが形成されるという不具合を確実に防止することが可能となる。しかも、櫛歯３３及び固定仕切部材３５は成形空間１３内に残った状態となるが、櫛歯３３部分においては加熱融着用の蒸気の流通を十分に確保できるので、品質バラツキの少ない成形品を製作できる。
【００４８】
尚、芯材１の離型時には、離型抵抗の大きい金型側に芯材１が残ることになるが、通常は成形面の形状や面積等の設定如何によりどちらの金型に成形品が残るかが不安定になることがある。本発明に係る成型装置１０においては、芯材１に対する固定仕切部材３５の離型抵抗と、芯材１に対する櫛状仕切部材３４の離型抵抗とを調整することで、所望の金型に対して成形品を残すことが可能となる。
また、離型抵抗の調整は、固定仕切部材３５のサイズや形状を調整したり、櫛歯３３の長さや本数、サイズや形状を調整したりすることで容易に調整できる。
【００４９】
次に、成形装置１０の構成を部分的に変更した他の実施例について説明する。
尚、前記実施例と同一部材には同一符号を付してその詳細な説明を省略する。
（１）図８、図９に示す成形装置１０Ａのように、前記櫛状仕切部材３４Ａをキャビティ型１２に片持ち状に固定し、櫛歯３３Ａの先端部を可動仕切部材３１付近或いは可動仕切部材３１と型開閉方向に重なるように配置させてなる区画手段３０Ａを設けてもよい。この成形装置１０Ａにおいては、櫛歯３３Ａの長さ設定がラフになるので、成形品形状の変更等に対しても容易に対応できるし、クラッキング充填のように、両金型１１，１２間にクラッキング隙間をあけた状態で、原料ビーズを充填する場合でも、可動仕切部材３１と櫛歯３３Ａのラップ量をクラッキング隙間よりも多少大きく設定することで、隣接する区画成形空間１３Ａ，１３Ｂを仕切ることが可能となる。また、固定仕切部材３５及び櫛状仕切部材３４Ａがキャビティ型１２側に配置され、キャビティ型１２に対する成形品の離型抵抗を容易に大きく設定できるので、成形品の離型時にキャビティ型１２側に成形品を確実に残すことが可能となる。但し、櫛歯３３Ａに代えて、可動仕切部材３１とキャビティ型１２間を閉鎖する固定仕切部材をキャビティ型１２に設けてもよい。
尚、この成形装置１０Ａを用いて成形した芯材１Ａは、図１０に示すように、その前部に櫛歯３３Ａにより複数の有底孔７Ａが形成されることになる。
【００５０】
（２）図１１に示す区画手段３０Ｂのように、可動仕切部材３１とキャビティ型１２とに隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけて型開閉方向に片持ち状に延びる複数の櫛歯３３Ｂからなる櫛状仕切部材４０，４１を設けてもよい。この場合には、櫛状仕切部材４０，４１の櫛歯３３Ｂの先端部を型開閉方向に重なるように配置することにより、前述の成形装置１０Ａと同様に、櫛歯３３Ｂの長さ設定をラフにできるとともに、クラッキング充填にも容易に対応できる。しかも、櫛歯３３Ｂとして短尺なものを採用できるので、成形品の離型性を向上できるとともに、櫛歯に作用する曲げモーメントを小さく設定できるので、櫛歯として小径のものを採用することが可能となり、櫛歯３３Ｂにより成形品に形成される有底孔を極力小径に構成できる。
また、成形品の離型時に、櫛状仕切部材４０，４１の引き抜き力をバランス良く成形品に作用させることが可能となり、成形品の離型性を向上できるとともに、離型時における成形品の破損を防止できる。この区画手段３０を用いて成形した芯材は、櫛歯３３Ｂに対応してその前部と後部とに複数の有底孔が形成されることになる。
尚、可動仕切部材３１とキャビティ型１２とに対する櫛歯の区分け方法としては、例えば図１２に示す区画手段３０Ｃのように、可動仕切部材３１に水平方向に配列した複数の櫛歯３３からなる櫛状仕切部材４２を設け、キャビティ型１２に鉛直方向に配列した複数の櫛歯３３からなる櫛状仕切部材４３を設けるなど、任意の区分け方法を採用することが可能である。
【００５１】
（３） 図１３に示す成形装置１０Ｄのように、櫛歯３３を省略して、可動仕切部材３１Ｄの先端部をキャビティ型１２の成形面に適合する形状に形成し、可動仕切部材３１Ｄと固定仕切部材３５とで成形空間１３を区画する区画手段３０Ｄを設けてもよい。この場には、可動仕切部材３１Ｄの後退時にその前部を成形空間１３内に突出させて、キャビティ型１２に沿った先端部が挿通孔３６の奧部側へ移動しないように設定することで、挿通孔３６に対する原料ビーズの侵入を防止して、挿通孔３６に沿ってバリが形成されることを防止することになる。
尚、この成形装置１０Ｄで成形した、芯材１Ｂには、図１４に示すように、芯材１Ｄの後部に可動仕切部材３１Ｄの先端側部分に適合する溝７Ｄが形成される。
【００５２】
（４） 図１５示す成形装置１０Ｅにように、可動仕切部材３１及び櫛歯３３に代えて、コア型１１に出没自在に設けた第１可動仕切部材３１Ｅであって、先端部の形状をコア型１１の成形面に適合する形状に形成した第１可動仕切部材３１Ｅと、キャビティ型１２に出没自在に設けた第２可動仕切部材４４であって、先端部の形状をキャビティ型１２の成形面に適合した形状に形成した第２可動仕切部材４４と、両可動仕切部材３１Ｅ，４４をそれぞれ進退駆動するエアシリンダ等からなるアクチュエータ３２Ｅ，４５とを設け、第１可動仕切部材３１Ｅが挿通するコア型１１の第１挿通孔３６Ｅと、第２可動仕切部材４４が挿通するキャビティ型１２の第２挿通孔４６と同じ形状に構成するとともに、両挿通孔３６Ｅ，４６を同一型開閉方向位置に配置した区画手段３０Ｅを設けてもよい。この成形装置１０Ｅにおいて成形空間１３を区画するときには、図１５（ｂ）に示すように、第１可動仕切部材３１Ｅ又は第２可動仕切部材４４を成形空間１３内へ突出させて成形空間１３が区画されるまでその先端部を第２挿通孔４６又は第１挿通孔３６Ｅに挿入し、成形空間１３を区画しないときには、図１５（ａ）に示すように、第１可動仕切部材３１Ｅをその先端部がコア型１１の成形面に面一になるまで後退させるとともに、第２可動仕切部材４４をその先端部がキャビティ型１２の成形面に面一になるまで後退させ、両挿通孔３６Ｅ，４６を可動仕切部材３１Ｅ，４４でそれぞれ閉鎖し、挿通孔３６Ｅ，４６に沿ってバリが形成されないように構成することになる。尚、この成形装置１０Ｅを用いて成形した芯材は、低発泡部と高発泡部との境界に有底孔７や貫通孔が形成されていない、全面が密着した成形品となる。
【００５３】
尚、型内発泡成形装置として、図１６に示すように、コア型１１及びキャビティ型１２から通気孔１８を完全に或いは略完全に省略した型内発泡成形装置５０を採用することも可能である。この場合には、コア型１１とキャビティ型１２とを型閉めした状態においても成形空間１３内に開口するクリアランス５１を両金型１１，１２の合わせ目に沿って形成し、このクリアランス５１を介して両チャンバー１６，１７とは独立に成形空間１３内に対して蒸気等の用役流体を供給したり、成形空間１３からドレン等を排出することになる。このような成形装置５０においては、通気孔１８の跡のない表面美麗な芯材１を製作できること、通気孔１８を形成することによる金型１１，１２の強度低下を防止できるので、金型１１，１２を薄肉に構成してその熱容量を小さく設定することが可能となり、加熱冷却の熱効率を向上したり、温度制御の精度を向上できること、通気孔１８を形成するための加工コストを大幅に削減でき、金型１１，１２の製作コストを低減できること、通気孔１８の目詰まりに基づく加熱不良、離型不良、冷却不良が発生せず、コアベント１９の取替えまたは定期的な高圧洗浄水による洗浄などのメンテナンス作業が全く不要となること、冷却工程で用いられる冷却水が成形空間１３内に侵入しなくなるので、芯材１の水分を従来の６〜１０％程度から０．５〜２％程度にまで低下でき、乾燥工程が不要となり、サイクル時間短縮に大いに寄与できること、などの効果が得られる。尚、区画手段３０に代えて区画手段３０Ａ〜３０Ｅを設けることも可能である。
【００５４】
尚、本実施例では、型内発泡成形品として自動車用バンパーの芯材１を製作するための型内発泡成形装置について説明したが、芯材１以外の成形品を製作する成形装置に対しても本発明を同様に適用することが可能である。
【００５５】
次に、図３に示す発泡成形装置１０を用いた芯材１の成形方法の一例について説明する。
先ず、区画成形空間１３Ａ，１３Ｂに原料ビーズを充填するため、コア型１１とキャビティ型１２とを型閉めし、可動仕切部材３１を前進位置へ移動させて、可動仕切部材３１と固定仕切部材３５と櫛状仕切部材３４とで成形空間１３内を３つの区画成形空間１３Ａ，１３Ｂに区画する。
【００５６】
次に、充填器１４から区画成形空間１３Ａ，１３Ｂに対して、櫛歯３３間の隙間よりも大きな直径で且つ異なる特性の原料ビーズを空気の流れに乗せてそれぞれ個別に供給し、成形空間１３内に原料ビーズを充填する。尚、本実施例では、自動車バンパーの芯材１を成形すべく、発泡倍率が５倍の原料ビーズを区画成形空間１３Ａ，１３Ｂに充填し、発泡倍率が２０倍の原料ビーズを区画成形空間１３Ａ，１３Ｂに充填する。但し、原料ビーズの発泡倍率は芯材１の強度等を考慮して任意に設定することが可能である。また、成形品の用途などに応じて、発泡倍率以外の特性の異なる原料ビーズ、例えばビーズ嵩密度、セル径、ビーズ径、素材などの異なる特性の原料ビーズを充填することも可能である。また、原料ビーズとして、ポリオレフィン系樹脂からなる原料ビーズを用いる場合には、原料ビーズの充填前に、図示外の成含タンク内に原料ビーズを充填して、０．０３〜０．２ＭＰａの無機ガスを原料ビーズに圧入することで、原料ビーズの発泡力を高めるように構成してもよい。原料ビーズの具体的な充填方法としては、クラッキング充填法、加圧充填法、圧縮充填法などの周知の充填方法を採用できる。
【００５７】
次に、各区画成形空間１３Ａ，１３Ｂに対して原料ビーズを充填した後、図７に示すように、可動仕切部材３１を後退位置に後退させて、可動仕切部材３１の先端をコア型１１の成形面と面一にし、可動仕切部材３１でコア型１１の挿通孔３６を閉鎖する。このとき、櫛状仕切部材３４は成形空間１３内に突出状に残った状態となる。
【００５８】
次に、両チャンバー１６，１７及び通気孔１８を介して成形空間１３に蒸気を供給して原料ビーズを加熱した後、蒸気圧を開放することで原料ビーズを発泡させ、原料ビーズを略隙間なく相互に融着させることになる。このとき原料ビーズ間に空気が残存していると原料ビーズ同士の密着性が低下するので、両チャンバー１６，１７及び成形空間１３内の空気を蒸気に置き換える作業を予め行うことになる。このとき櫛状仕切部材３４の対応位置においても、櫛歯３３間の隙間を介して隣接する区画成形空間１３Ａ，１３Ｂに充填された原料ビーズが相互に融着することになる。また、櫛歯３３に対応する位置には有底孔７が形成されるもの、挿通孔３６は前述のように可動仕切部材３１で閉鎖されるので、挿通孔３６への原料ビーズの侵入が防止され、挿通孔３６に対応する位置にバリが形成されることが防止される。
【００５９】
次に、コア型１１及びキャビティ型１２に向けて図示外のノズルから冷却水を噴霧し、成形空間１３内の芯材１を冷却してから、金型１１，１２を型開きし、図示外のエジェクタピンを用いて芯材１をキャビティ型１２から離型する。尚、櫛刃３３がコア型１１側に配置され、コア型１１側の成形品の離型抵抗が大きくなり易いので、キャビティ型１２に成形品が確実に残るように、金型１１，１２を型開きする前に、可動仕切部材３１を更に後方へ移動させて成形品から櫛歯３３を抜き取るように構成してもよい。
【００６０】
尚、原料ビーズとして、櫛歯３３間を通り抜け不能な直径の第１原料ビーズと、櫛歯３３間を通り抜け可能な第２原料ビーズとを用いる場合には、成形空間１３への原料ビーズの充填時に、第１原料ビーズを区画成形空間１３Ａ，１３Ｂに充填した後、第２原料ビーズを区画成形空間１３Ａ，１３Ｂに充填することになる。この場合には、第１原料ビーズの一部が櫛歯３３間を通って区画成形空間１３Ａ，１３Ｂ内へ移動するので、第１原料ビーズと第２原料ビーズの密着性をより一層高めることが可能となる。
【００６１】
また、図１５に示す成形装置１０Ｅを用いて成形する場合には、成形空間１３内を３つの区画成形空間１３Ａ，１３Ｂに区画するときに、図１５（ｂ）に示すように、第１可動仕切部材３１Ｅを前進位置へ移動させるとともに、第２可動仕切部材４４を後退位置へ移動させ、第１可動仕切部材３１Ｅで成形空間１３を区画するとともに、第１可動仕切部材３１Ｅの先端部を第２挿通孔４６に挿入して、第１可動仕切部材３１Ｅを両端支持することになる。また、原料ビーズを蒸気で加熱融着する最には、図１５（ａ）に示すように、可動仕切部材３１Ｅ，４４をその先端部がコア型１１の成形面とキャビティ型１２の成形面にそれぞれ面一になるように移動させて、挿通孔３６Ｅ，４６を可動仕切部材３１Ｅ，４４でそれぞれ閉鎖してから、蒸気を供給することになる。
【００６２】
また、図１６に示すよう型内発泡成形装置５０を用いて成形する場合には、芯材１の外面の目立つ場所を成形する成形部に通気孔１８が形成されていないコア型１１及びキャビティ型１２を用いていることから、原料ビーズの充填時には原料ビーズとともに成形空間１３内に供給される充填用エアを、クリアランス５１を介して成形空間１３外へ排出することになる。また、蒸気により原料ビーズを加熱融着するときには、チャンバー１６，１７に蒸気を供給するとともに、クリアランス５１を介して成形空間１３内へ蒸気を供給することになる。
本実施例では、自動車用バンパーの芯材１を成形するための成形方法について説明したが、芯材１以外の型内発泡成形品を成形する場合においても、本発明を同様に適用できる。
【００６３】
【発明の効果】
本発明に係る第１〜第３の型内発泡成形装置によれば、隣接する区画成形空間内に異なる特性の原料ビーズを充填できるので、区画成形空間の形成位置やサイズ、充填する原料ビーズの特性などを適正に設定することで、成形品の性能や品質を向上できる。また、可動仕切部材により原料ビーズの加熱融着時に挿通孔に対して原料ビーズが侵入することを防止して、挿通孔を設けた位置におけるバリの発生を確実に防止できる。更に、櫛歯による区画部分においては、原料ビーズの充填用や加熱融着用の空気や蒸気等の流体の出入りが可能となるので、原料ビーズの充填時には、原料ビーズの充填密度のバラツキを極力少なく設定でき、また原料ビーズの加熱融着時には、原料ビーズに対してムラなく蒸気を作用させることが可能となり、成形品の品質を向上できる。
【００６４】
しかも、第２の型内発泡成形装置では、櫛歯の長さをラフに設定できる。また、第３の型内発泡成形装置では、成形品に形成される有底孔を極力小径に構成できること、成形品の離型性を向上できること、などの効果が得られる。
【００６５】
ここで、前記櫛歯を弾性変形可能な素材で構成すると、充填圧や発泡圧により櫛歯が多少変形しても元の形状に復帰するので、櫛歯の塑性変形による成形不良を防止できるとともに、櫛歯の断面積を極力小さく設定して、成形品の外観低下や強度低下を抑制できる。
【００６６】
また、エジェクタピンを有する金型に仕切部材を固定すると、金型を型開きしたときに、エジェクタピンを有する金型側に成形品を残置させることが可能となり、エジェクタピンを有しない金型側に成形品が残置されることによる成形品の離型不良を効果的に防止できる。
【図面の簡単な説明】
【図１】自動車用バンパーの芯材の斜視図
【図２】図１のII-II線断面図
【図３】型内発泡成形装置の縦断面図
【図４】通気孔付近の金型の縦断面図
【図５】コアベントの正面図
【図６】区画手段の説明図
【図７】区画手段の作動説明図
【図８】他の構成の区画手段を備えた型内発泡成形装置の縦断面図
【図９】同区画手段の作動説明図
【図１０】同成形装置で成形した芯材の縦断面図
【図１１】他の構成の区画手段の説明図
【図１２】他の構成の区画手段の説明図
【図１３】他の構成の区画手段を備えた型内発泡成形装置の縦断面図
【図１４】同成形装置で成形した芯材の縦断面図
【図１５】他の構成の区画手段を備えた型内発泡成形装置の(ａ)は可動仕切部材後退時の説明図、（ｂ）は成形空間区画時の説明図
【図１６】 他の成形装置の縦断面図
【符号の説明】
１ 芯材 ２ 前部衝撃吸収部
３ 側部衝撃吸収部 ４ 角部
５ 低発泡部 ６ 高発泡部
７ 有底孔
１０ 型内発泡成形装置 １１ コア型
１２ キャビティ型 １３ 成形空間
１４ 充填器 １５ ハウジング
１６ 第１チャンバー １７ 第２チャンバー
１８ 通気孔 １９ コアベント
１９ｂ スリット １９ａ 丸孔
２０ コアベント取付孔 ２１ コアベントホール
２２ 供給管 ２３ 排出管
３０ 区画手段 ３１ 可動仕切部材
３２ アクチュエータ ３３ 櫛歯
３４ 櫛状仕切部材 ３５ 固定仕切部材
３６ 挿通孔 ３７ 水平壁
３８ 鉛直壁
１Ａ 芯材 ７Ａ 有底孔
１０Ａ 成形装置 １３Ａ 区画成形空間
３０Ａ 区画手段 ３１Ａ 可動仕切部材
３３Ａ 櫛歯 ３４Ａ 櫛状仕切部材
３０Ｂ 区画手段 ４０ 櫛状仕切部材
４１ 櫛状仕切部材
３０Ｃ 区画手段 ４２ 櫛状仕切部材
４３ 櫛状仕切部材
１Ｄ 芯材 ７Ｄ 溝
１０Ｄ 成形装置 １３Ｄ 区画成形空間
３０Ｄ 区画手段 ３１Ｄ 可動仕切部材
３０Ｅ 区画手段 ３１Ｅ 第１可動仕切部材
３６Ｅ 挿通孔 ４４ 第２可動仕切部材
４５ アクチュエータ ４６ 挿通孔
５０ 型内発泡成形装置 ５１ クリアランス[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-mold foam molding apparatus suitable for forming a molded part made of raw material beads having different characteristics in one molded product.
[0002]
[Prior art]
For example, US Pat. No. 5,164,257 discloses an in-mold foam molding apparatus that manufactures a molded product using raw material beads made of a thermoplastic synthetic resin. One of the molds protrudes into a molding space via an actuator such as an air cylinder. A flexible partition member is provided, and the partition space is partitioned into a plurality of partition molding spaces by this partition member, and a filler for supplying raw material beads is individually connected to each partition molding space. In a state where the inside is partitioned, for example, raw material beads having different expansion ratios are filled in the adjacent partition molding space, and after filling, the partition member is retracted and then the steam is supplied into the molding space, so that the raw material beads are An in-mold foam molding technique is described which is configured to obtain a molded product by heat fusion.
[0003]
In molded products molded by this in-mold foam molding technology, it is possible to produce molded products with different mechanical properties depending on the part, for example, by changing the raw material beads used depending on the part of the molded product. Therefore, it is being adopted as a core material for bumpers for automobiles and as a cushioning material for packing home appliances and furniture.
[0004]
[Problems to be solved by the invention]
In the molding apparatus described in the above-mentioned US publication, it is necessary to provide an actuator for projecting and retracting the partition member. Therefore, when the number of sections in the molding space increases, the drive system for the partition member becomes correspondingly complicated, and the molding apparatus There is a problem that the production cost of the is high.
In addition, there is a concern about deformation of the partition member due to the differential pressure unless the control is performed so that the differential pressure does not occur in the filling pressure in the adjacent partition forming space. There is also a problem that the flow of the filling air is hindered by the partition member and the filling property of the raw material beads is lowered.
[0005]
Further, in this molding apparatus, there is a problem that a burr is formed along the insertion hole on the surface of the molded product because an insertion hole is formed in the mold and the partition member is detachably mounted in the insertion hole. There is. That is, the shape of the front end portion of the partition member is formed along the shape of the inner surface of the counterpart mold, but is not necessarily the same shape as the inner surface of the mold provided with the insertion hole. When the partition member is retracted after filling the beads, a part of the partition member may be immersed to the flange side of the insertion hole, and the internal space of the insertion hole may be opened to the molding space. However, since the opening width of the insertion hole is set to be smaller than the diameter of the raw material beads and the raw material beads do not enter the insertion hole, the raw material beads can be inserted into the insertion hole only by retracting the partition member. However, when the raw material beads are heated and fused by supplying steam into the molding space, the raw material beads soften and foam, so that a part of the raw material beads enter the insertion hole. Thus, an elongated burr along the position corresponding to the insertion hole of the molded product is formed in a protruding shape.
[0006]
Such burrs do not pose a major problem for molded products with rough surface dimensional accuracy requirements, but may cause product defects in demanding molded products. For example, in automobile bumpers, a core material as an in-mold foam molded product is fixed to the front side of the front beam of an automobile, and a synthetic resin cover member is disposed so as to cover the core material. However, in such an automobile bumper, a gap is formed between the core material and the front beam or between the core material and the cover member, and the core material cannot be fixed at an appropriate position on the front beam mounting surface. Since a problem that the cover member cannot be fixed at an appropriate position of the vehicle body occurs, it has been necessary to remove the burrs after molding the core material in order to prevent this.
[0007]
An object of the present invention is to provide an in-mold foam molding apparatus capable of molding a molded part composed of raw material beads having different characteristics into one molded product and preventing the occurrence of burrs at the boundary between molded parts having different characteristics. It is.
[0008]
[Means for Solving the Problem and Action]
In a first in-mold foam molding apparatus according to the present invention, a movable partition member for partitioning a molding space into a plurality of partition molding spaces is provided in a first mold so as to be able to appear and retract, and a tip portion of the movable partition member is provided. It is formed in a shape suitable for the molding surface of the first mold, and at the tip of the movable partition member, at least one of the raw material beads filled in the adjacent partition molding space is spaced in the mold opening / closing direction so that it cannot pass through. A plurality of comb teeth extending in a holding shape are provided, and the tips of the plurality of comb teeth are formed to have a shape suitable for the molding surface of the second mold combined with the first mold. The movable partition member is protruded into the molding space, and in the state where the molding space is partitioned into a plurality of partition molding spaces, the raw material beads are filled into the partition molding space, and then the tip of the movable partition member is the molding surface. The raw material beads are heat-sealed with the movable partition member retracted until it is flush with Is.
[0009]
In this first molding apparatus, the movable partition member is projected into the molding space together with the comb teeth, and the molding space is partitioned into a plurality of partition molding spaces, and in this state, the adjacent partition molding spaces have different characteristics. Each raw material bead is filled. For this reason, the performance and quality of a molded product can be improved by appropriately setting the formation position and size of the compartment molding space and the characteristics of the raw material beads to be filled. For example, in parts where importance is placed on strength, the strength rigidity of the molded product is increased using raw material beads having a low expansion ratio, and the weight of the molded product is reduced by using raw material beads having a high expansion ratio in other parts. It is possible to achieve both improvement in strength and weight reduction of the molded product.
[0010]
In addition, after filling the raw material beads, the movable partition member is retracted to supply steam into the molding space, and the raw material beads are heated and fused. By moving the movable partition member backward so that it is flush with the molding surface of the mold, that is, the insertion hole of the movable partition member formed in the first mold is closed at the tip of the movable partition member, the raw material beads It is possible to effectively prevent the occurrence of burrs at the position where the insertion hole is provided by preventing the raw material beads from entering the insertion hole at the time of heat fusion.
[0011]
Furthermore, in this first molding apparatus, fluid such as air and steam can be entered and exited at the partition portion by the comb teeth, and therefore, compared with the case where the partition molding space is partitioned by only the movable partition member, the raw material beads are filled. Sometimes it is possible to ensure the flow of filling air in the adjacent compartment molding space, and to improve the quality of molded parts by preventing the smooth flow of steam as much as possible when heating and fusing raw material beads. it can. Moreover, although the bottomed hole is formed at a position corresponding to the comb teeth in the molded product, since the raw material beads are in close contact between the adjacent bottomed holes, it is possible to prevent the strength of the molded product from being lowered.
[0012]
In the second in-mold foam molding apparatus according to the present invention, a movable partition member for partitioning the molding space into a plurality of partition molding spaces is provided in the first mold so as to be able to protrude and retract, and a distal end portion of the movable partition member is provided. The shape is adapted to the molding surface of the first mold, and between the movable partition member and the molding surface of the second mold with the movable partition member protruding from the second mold combined with the first mold. A plurality of comb teeth that can be prevented from passing through the raw material beads in the mold opening and closing direction with at least one of the raw material beads filling the adjacent partition molding space facing the movable partition member and spaced from each other. Establishment The movable partition member is protruded into the molding space, and in the state where the molding space is partitioned into a plurality of partition molding spaces, the raw material beads are filled into the partition molding space, and then the tip of the movable partition member is the molding surface. The raw material beads are heat-sealed with the movable partition member retracted until it is flush with Is.
[0013]
In the second in-mold foam molding apparatus, basically the same action as that of the first in-mold foam molding apparatus can be obtained. However, in the first in-mold foam molding apparatus, the tip of the comb teeth is connected to the second mold. In the second in-mold foam molding apparatus, the tip of the comb teeth may be adapted to the shape of the tip of the movable partition member. Since the movement of the raw material beads can be prevented by setting so as to overlap the tip of the movable partition member, the length of the comb teeth can be set to be extremely rough.
[0014]
In a third in-mold foam molding apparatus according to the present invention, a movable partition member for partitioning a molding space into a plurality of partition molding spaces is provided in the first mold so as to be able to protrude and retract, and a tip portion of the movable partition member is provided. The raw material between the molding surface of the second mold and the movable partition member is formed into a shape suitable for the molding surface of the first mold, and the tip of the movable partition member and the second mold combined with the first mold. A plurality of comb teeth for restricting the passage of beads are provided in a cantilevered manner in the mold opening and closing direction with an interval where at least one of the raw material beads filling the adjacent partition forming space cannot pass through and the tips are wrapped together. The movable partition member is protruded into the molding space, and in the state where the molding space is partitioned into a plurality of partition molding spaces, the raw material beads are filled into the partition molding space, and then the tip of the movable partition member is the molding surface. The raw material beads are heat-sealed with the movable partition member retracted until it is flush with Is.
[0015]
In the third in-mold foam molding apparatus, basically the same action as that of the first in-mold foam molding apparatus can be obtained. In the first in-mold foam molding apparatus, the tip of the comb teeth is connected to the second mold. However, in the third in-mold foam molding apparatus, it is possible to prevent the movement of the raw material beads by setting the tips of the comb teeth to overlap each other. Therefore, it becomes possible to set the length of the comb teeth to be extremely rough. In addition, since it is possible to adopt a short comb tooth, it is possible to improve the releasability of the molded product and to set a small bending moment acting on the comb tooth, so it is possible to adopt a small diameter comb tooth. The bottomed hole formed in the molded product by the comb teeth can be configured as small as possible. In addition, when the molded product is released, the pulling force of the comb teeth can be applied to the molded product in a well-balanced manner, so that the release property of the molded product can be improved and the molded product can be prevented from being damaged during the release.
[0016]
Here, the comb teeth are preferably made of a material that can be elastically deformed. In other words, in order to prevent the comb teeth from being deformed by receiving a filling pressure, a foaming pressure, or the like, it is preferable to increase the strength rigidity by setting the cross-sectional area to be large. A hole is formed, which causes a decrease in the appearance and strength of the molded product. Therefore, by configuring the comb teeth with a material that can be elastically deformed, it is possible to return to the original shape even if the comb teeth are slightly deformed by filling pressure or foaming pressure, thereby preventing molding defects due to plastic deformation of the comb teeth. However, it is preferable that the cross-sectional area of the comb teeth be set as small as possible so that the appearance deterioration and strength reduction of the molded product can be suppressed.
[0017]
In order to improve the releasability of the molded product, it is preferable to provide comb teeth on a mold having an ejector pin. In other words, depending on the shape of the mold, when the mold is opened, the molded product may remain on the mold side that does not have the ejector pin, and a mold release failure may occur. Since the mold is opened in close contact with the molded product, when the mold is opened, the molded product tends to remain on the mold side provided with comb teeth. For this reason, it becomes possible to prevent the above-mentioned mold release defect effectively by providing a comb tooth in the metal mold | die which has an ejector pin.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to an in-mold foam molding apparatus for molding a core material of an automobile bumper as an in-mold foam molded product.
[0023]
First, a core material for an automobile bumper as an in-mold foam molded product will be described.
As shown in FIG. 1 and FIG. 2, the core material 1 includes a front impact absorbing portion 2 in which both end portions are gently curved backward, and a side impact extending rearward from both ends of the front impact absorbing portion 2. And an absorbing portion 3. A low foamed portion 5 made of raw material beads having a low expansion ratio is formed in the lower half of the corner portion 4 from the front impact absorbing portion 2 to the side impact absorbing portion 3, and the other portions are lower than the low foamed portion 5. It is comprised by the high foaming part 6 which consists of a raw material bead with a high expansion ratio.
[0024]
In other words, the central portion of the front impact absorbing portion 2 is for absorbing impact energy at the time of forward collision, but since the pressure receiving area of impact energy can be set large, it is a soft and lightweight raw material bead with a high expansion ratio. The both ends of the front impact absorbing portion 2 and the side impact absorbing portion 3 are configured to absorb impact energy at the time of offset collision or oblique collision, and set a large pressure receiving area for impact energy. However, by providing the low foaming portion 5 made of hard raw material beads which are heavier than other parts but have a low foaming ratio, the core material 1 is secured while ensuring sufficient collision safety performance at the time of various frontal collisions. It is comprised so that the weight of can be reduced as much as possible. The size of the low foamed portion 5 can be arbitrarily set as long as it is configured to sufficiently absorb impact energy acting on the core material 1. Further, in this embodiment, the low foaming part 5 is formed only in the lower half part of the corner part 4 of the core material 1, but the formation position of the low foaming part 5 is a position that can sufficiently ensure the collision safety. For example, the entire corner portion 4 can be configured by the low foaming portion 5. Moreover, the external appearance shape and size of the core material 1 can be arbitrarily set according to the motor vehicle to which it applies.
[0025]
As shown in FIG. 1, the low foaming part 5 and the high foaming part 6 are partitioned at the position of a substantially L-shaped boundary L in front view, and the rear part of the core 1 is front and rear at regular intervals along the boundary L. A bottomed hole 7 extending in the direction is formed, and a pair of slits 8 extending in the front-rear direction along the boundary L are formed in the lower part of the core material 1. Further, the core material 1 is molded by using an in-mold foam molding apparatus 10 to be described later, so that a burr protrudes from the boundary L between the low foam portion 5 and the high foam portion 6 as in a conventional molded product. Therefore, the molded core material 1 can be accurately fixed to the mounting surface of the front beam of the automobile or the cover member can be covered without a gap without going through a complicated process for removing burrs. It becomes possible.
[0026]
Note that the boundary L is not necessarily formed in a U-shape in front view, and is formed in an L-shape, a straight line shape, or a curved shape in front view according to the shape, size, formation position, and the like of the low foam portion 5. Is also possible. In the present embodiment, the core material 1 of the bumper for automobiles has been described. However, as long as it is a molded product having a molded part made of raw material beads having different characteristics, it can be applied to in-mold foam molded products other than the core material 1. The present invention is equally applicable. Furthermore, depending on the molded product, a molded product using raw material beads having different characteristics other than the expansion ratio, for example, raw material beads having different characteristics such as bead bulk density, cell diameter, bead diameter, and material, so as to suit the use conditions. May be configured.
[0027]
The raw material bead material is selected according to the conditions of use of the molded product to be manufactured. Polystyrene synthetic resins such as polystyrene-based synthetic resin materials, polyethylene-based resins and polypropylene-based resin materials Materials and copolymers of these synthetic resin materials can be used.
The expansion ratio of the raw material beads is preferably in the range of 3 to 150 times, although it depends on the raw material of the raw material beads. Specifically, 3 to 100 times, preferably 3 to 80 times in raw material beads made of polystyrene synthetic resin material, 3 to 90 times, preferably 3 to 60 in raw material beads made of polyolefin synthetic resin material. Double ones can be suitably used. A particle size in the range of 1 to 10 mm, preferably 2.0 to 8 mm can be suitably used.
[0028]
Specific examples of polyolefin resin materials include ethylene propylene random polypropylene resin, ethylene propylene block polypropylene resin, homopolypropylene ethylene propylene butene random terpolymer, linear low density polyethylene (LLDPE), and crosslinked low density polyethylene (crosslinked LDPE). Can be suitably used.
[0029]
When the cell diameter of the raw material beads made of such a polyolefin-based resin material is less than 100 μm, there is a problem that surface elongation is poor at the time of molding, there is a problem that it is easy to sink, and the appearance of an appropriate surface appearance is inferior. Has a problem that the cell diameter is likely to be non-uniform, the cell diameter is large and the surface is rough, and the appropriate surface appearance is inferior, so it is in the range of 100 to 900 μm, more preferably 150 to 700 μm, particularly preferably. It will be set to 170-550 micrometers.
[0030]
The DSC 2′nd peak ratio is preferably set to 8% to 60%. DSC 2'nd peak ratio is the total of two low temperature and high temperature DSC (differential scanning calorimetry) peaks formed due to the crystalline melting point of the base resin when the base resin is heated. When the DSC 2′nd peak ratio is less than 8%, the heating condition width at the time of molding is narrow, and the molded body tends to shrink and sink easily. On the other hand, if it exceeds 60%, it is necessary to greatly increase the heating conditions, and it is necessary to increase the size of the molding machine, and it is negative from the viewpoint of energy saving, so it is 8 to 60%, more preferably 10 to 50%. %, Particularly preferably 15 to 40%.
[0031]
If the closed cell ratio is less than 65%, even if the heating pressure at the time of molding is increased and the beads are somehow fused together, shrinkage and sink marks of the molded body tend to increase, and the molded body of the target quality. Is less than 65%, more preferably 75% or more, and particularly preferably 85% or more.
[0032]
Next, the in-mold foam molding apparatus 10 capable of molding the core material 1 described above will be described.
As shown in FIG. 3, the in-mold foam molding apparatus 10 includes a core mold 11 and a cavity mold 12 as a pair of opposed molds, and a molding space 13 formed by the core mold 11 and the cavity mold 12. Is divided into a plurality of compartment molding spaces 13A and 13B, and a filler 14 is provided in each of the compartment molding spaces 13A and 13B. The core mold 11 corresponds to the first mold, and the cavity mold 12 corresponds to the second mold.
[0033]
The core mold 11 and the cavity mold 12 are respectively attached to housings 15 having a frame-shaped frame and a back plate. A pair of first chamber 16 and second chamber 17 are provided on the back side of the core mold 11 and the cavity mold 12. Each of the core mold 11 and the cavity mold 12 is formed with a large number of air holes 18 that communicate the chambers 16 and 17 with the molding space 13. The vent hole 18 actually has an outer diameter of 7 to 12 mm in which a plurality of round holes 19a having a diameter of about 0.5 mm and slits 19b having a width of about 0.5 mm are provided as illustrated in FIGS. A core vent 19 formed of a cylindrical body having a lid is formed by fitting into a core vent mounting hole 20 formed in a hole in the molds 11 and 12, or about 0.5 mmφ formed directly on the molds 11 and 12. Core vent hole 21.
[0034]
A supply pipe 22 for supplying a working fluid such as steam or compressed air is connected to the first chamber 16 and the second chamber 17, respectively, and a discharge pipe 23 connected to a decompression means or a drain pipe is connected to the first chamber 16 and the second chamber 17. The supply and discharge of the working fluid such as steam and compressed air to the first chamber 16 and the second chamber 17 can be individually controlled by operating a valve (not shown).
[0035]
As shown in FIGS. 3 and 6, the in-mold foam molding apparatus 10 is provided with two sets of partition means 30 corresponding to the low foaming portion 5 of the core material 1, and the inside of the molding space 13 includes these two sets. The partition means 30 is configured to be partitionable into two partition molding spaces 13A and 13B for molding the low foaming portion 5 and one partition molding space 13A and 13B for molding the high foaming portion 6. . A raw material bead filler 14 is connected to each of the compartment forming spaces 13A and 13B, and is configured so that the adjacent bead forming spaces 13A and 13B can be filled with raw material beads having different characteristics. In this embodiment, in order to mold the core material 1 of the bumper for automobiles, the molding space 13 is divided into three. However, the shape, the number and the position of the molding space 13 depend on the molded product to be manufactured. It can be set arbitrarily. The filler 14 may be provided on the core mold 11 side or on the cavity mold 12 side, but it is opposite to the movable partition member 31 described later in order to prevent the mold structure from becoming complicated. It is preferable to arrange in the mold on the side. Furthermore, the raw material beads having different expansion ratios were filled in the adjacent partition molding spaces 13A and 13B. However, depending on the use of the molded product, the raw material beads having different characteristics such as the bead bulk density, cell diameter, bead diameter, and material are used. It is also possible to fill.
[0036]
As shown in FIGS. 3, 6, and 7, the partition means 30 includes a movable partition member 31 that is provided in the core mold 11 so as to be movable in and out, and the movable partition member 31 illustrated in FIG. 3 and the forward position illustrated in FIG. 7. An actuator 32 made of an air cylinder or the like that is driven back and forth to the retreat position, a comb-like partition member 34 made up of a plurality of comb teeth 33 provided at the tip of the movable partition member 31, and a cavity so as to continue to the movable partition member 31 A pair of fixed partition members 35 provided in the mold 12 and moving the movable partition member 31 to the forward movement position so that at least one of the raw material beads filling the adjacent partition forming spaces 13A and 13B cannot pass through. The movable partition member 31, the comb teeth 33, and the fixed partition member 35 divide the molding space 13 into a plurality of partition molding spaces 13A and 13B.
[0037]
Since the movable partition member 31 is provided so as to be able to protrude and retract with respect to the core mold 11, a substantially U-shape in front view through which the movable partition member 31 is inserted at the boundary L between the low foamed portion 5 and the high foamed portion 6 of the core mold 11. A shaped insertion hole 36 is formed. The opening width of the insertion hole 36 is set smaller than the bead diameter of the raw material beads, and the raw material beads are prevented from inadvertently entering the insertion hole 36. Specifically, it is set to 20 to 70% of the diameter of the raw material beads. In addition, the gap between the movable partition member 31 and the core mold 11 is preferably set to be as narrow as possible in order to prevent the formation of burrs. It is set to 5 mm.
[0038]
The movable partition member 31 is composed of a plate-like member made of a metal material, a synthetic resin material, a ceramic material, or the like, and is formed in a substantially U shape in front view by a horizontal wall 37 and a vertical wall 38 extending downward from both side ends thereof. Has been. The distal end of the movable partition member 31 in the mold opening / closing direction is formed in a shape that matches the molding surface of the core mold 11, and the movable partition member 31 is moved to the retracted position while the distal end of the movable partition member 31 is the core mold. 11 is arranged so as to be flush with the molding surface, and the insertion hole 36 is closed so that the raw material beads can be prevented from entering the insertion hole 36. The thickness of the movable partition member 31 can be set to any thickness as long as it has a strength that can withstand the filling pressure of the raw material beads. However, after filling the raw material beads, the movable partition member 31 is retracted. Sometimes, it is preferable to set it as thin as possible so that the volume in the molding space 13 hardly changes. The movable partition member 31 can also be configured by combining three flat plate members in a substantially U shape.
[0039]
The fixed partition member 35 is formed in an appropriate size and shape according to the mold shape, the shape of the molding space 13, and the like. More specifically, the portion in which the molding space 13 cannot be physically partitioned by the movable partition member 31, or the partitioning by the movable partition member 31, although it can be physically partitioned, is a slight backward movement of the movable partition member 31. Thus, the portion that moves to the flange side of the insertion hole 36 and that forms burrs along the insertion hole 36 can be partitioned in a point manner instead of the movable partition member. However, the fixed partition member 35 is not necessarily provided and can be omitted.
[0040]
Although not shown, a guide groove for guiding the lower end edge of the vertical wall 38 of the movable partition member 31 in the mold opening / closing direction is formed on the upper surface of the fixed partition member 35, and the lower end portion of the vertical wall 38 is formed by this guide groove. By holding, the strength rigidity of the movable partition member 31 with respect to the filling pressure of the raw material beads is increased.
[0041]
The fixed partition member 35 may be formed integrally with the mold, or may be provided on the mold by fixing another member made of a metal material, a synthetic resin material, a ceramic material, or the like with a bolt or the like. The thickness of the fixed partition member 35 can be set to any thickness as long as it has a strength that can withstand the filling pressure of the raw material beads, but a groove is formed by the fixed partition member 35 in the molded product. Therefore, it is preferable to set the thickness as thin as possible in order to prevent a decrease in strength and appearance of the molded product.
[0042]
The distal end of the movable partition member 31 is provided with a plurality of comb teeth 33 extending in a cantilevered manner in the mold opening and closing direction with an interval T at which the raw material beads filling at least one of the partition molding spaces 13A and 13B cannot pass through. ing. If this interval T is too narrow, the adhesiveness between the raw material beads filled in the adjacent compartment forming spaces 13A and 13B cannot be sufficiently secured, and the strength of the molded product is reduced, so the diameter of the raw material beads that cannot pass through. 30 to 90%, more preferably 50 to 80%.
[0043]
The comb-shaped partition member 34 is composed of a plurality of comb teeth 33 extending in a cantilevered manner from the distal end portion of the movable partition member 31 in the mold opening / closing direction, and the distal end portion of each comb tooth 33 is shaped to fit the molding surface of the cavity mold 12. The gap between the tip of the movable partition member 31 and the molding surface of the cavity mold 12 is closed by the plurality of comb teeth 33 when the movable partition member 31 is moved to the advanced position. Has been.
[0044]
The comb teeth 33 are constituted by elongated rod-like or pipe-like members, and the outer shape can be of any outer shape such as a polygonal shape, a circular shape, or an elliptical shape. The material of the comb teeth 33 may be any material such as a metal material, a synthetic resin material, or ceramics as long as the material can withstand the filling pressure of the material beads and can withstand the heat during heat fusion of the material beads. it can. Further, when this partitioning means 30 is used, since the bottomed hole 7 is formed in the core material 1 at a position corresponding to the comb teeth 33 as shown in FIGS. The diameter of the teeth 33 can be set arbitrarily, but is preferably set as small as possible, for example, 1 to 10 mm, preferably 1.5 to 5 mm. Further, it is preferable to use a metal material or a synthetic resin material that can be elastically deformed as the comb teeth 33. With this configuration, even if the comb teeth 33 are slightly deformed by the filling pressure or the foaming pressure, the original shape can be restored, so that molding defects such as filling failure and mold release failure due to plastic deformation of the comb teeth 33 can be prevented. By setting the cross-sectional area of the comb teeth 33 as small as possible, it is possible to suppress deterioration in the appearance and strength of the molded product.
[0045]
In this comb-shaped partition member 34, a plurality of comb teeth 33 are arranged in the same plane, and the boundary L between the low foaming portion 5 and the high foaming portion 6 partitioned by the comb teeth 33 is configured as a flat surface. When the comb teeth 33 are arranged so that the boundary L has a waveform surface shape such as a rectangular wave shape, a triangular wave shape, a sine wave shape, etc., the contact area of the raw material beads between the adjacent partition forming spaces 13A and 13B is increased. This is preferable because the bond strength can be improved. Moreover, although the case where the boundary L between the low foaming portion 5 and the high foaming portion 6 is substantially U-shaped in front view has been described, other shapes such as an L-shape, a crank shape, or a straight shape may be formed. is there.
[0046]
In this partitioning means 30, the movable partition member 31, the comb teeth 33, and the fixed partition member 35 are moved into the three partition molding spaces 13 </ b> A and 13 </ b> B with the movable partition member 31 moved to the forward position. When it is partitioned and the movable partition member 31 is moved backward, the fixed partition member 35 and the comb teeth 33 remain in the molding space 13, but in other parts, the raw material beads in the adjacent partition molding spaces 13A and 13B Since the raw material beads in the adjacent partition molding spaces 13A and 13B are in close contact with each other through the gap between the comb teeth 33 in the comb-shaped partition member 34, the strength of the molded product is sufficiently secured. It will be possible. Moreover, even when the movable partition member 31 is moved to the advanced position, the adjacent compartment forming spaces 13A and 13B communicate with each other through the gap between the comb teeth 33, so that the space between the adjacent compartment forming spaces 13A and 13B is between. The distribution of the filling air can be ensured to improve the filling property of the raw material beads, and an excessive filling pressure can be prevented from acting on the movable partition member 31.
[0047]
Further, in the state where the movable partition member 31 is moved to the retracted position, the insertion hole 36 formed in the core mold 11 is closed by the distal end portion of the movable partition member 31, so that when the raw material beads are heated and fused by steam, Even if the beads are softened, the entry of the raw material beads into the insertion hole 36 is almost completely prevented, and it is possible to reliably prevent the problem that burrs are formed in the molded product along the insertion hole 36. . Moreover, although the comb teeth 33 and the fixed partition member 35 remain in the molding space 13, since the distribution of the steam for heat fusion can be sufficiently secured in the comb teeth 33, a molded product with less quality variation can be obtained. Can be produced.
[0048]
When the core material 1 is released, the core material 1 remains on the side of the mold having a large release resistance. Usually, depending on the setting of the shape and area of the molding surface, the molded product is placed in either mold. The remaining may become unstable. In the molding apparatus 10 according to the present invention, by adjusting the mold release resistance of the fixed partition member 35 with respect to the core material 1 and the mold release resistance of the comb-shaped partition member 34 with respect to the core material 1, the desired mold can be obtained. It becomes possible to leave the molded product.
The mold release resistance can be easily adjusted by adjusting the size and shape of the fixed partition member 35 and adjusting the length, number, size and shape of the comb teeth 33.
[0049]
Next, another embodiment in which the configuration of the molding apparatus 10 is partially changed will be described.
The same members as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
(1) Like the molding apparatus 10A shown in FIGS. 8 and 9, the comb-shaped partition member 34A is fixed to the cavity mold 12 in a cantilevered manner, and the tip of the comb teeth 33A is located near the movable partition member 31 or the movable partition. You may provide the partition means 30A arrange | positioned so that it may overlap with the member 31 and a mold opening / closing direction. In this molding apparatus 10A, since the length setting of the comb teeth 33A becomes rough, it is possible to easily cope with a change in the shape of the molded product, and between the molds 11 and 12 like cracking filling. Even when the raw material beads are filled with a cracking gap, the adjacent partition molding spaces 13A and 13B are partitioned by setting the wrap amount of the movable partition member 31 and the comb teeth 33A slightly larger than the cracking gap. Is possible. In addition, the fixed partition member 35 and the comb-shaped partition member 34A are arranged on the cavity mold 12 side, and the mold release resistance of the molded product with respect to the cavity mold 12 can be easily set large. It is possible to reliably leave the molded product. However, instead of the comb teeth 33 </ b> A, a fixed partition member that closes the space between the movable partition member 31 and the cavity mold 12 may be provided in the cavity mold 12.
As shown in FIG. 10, the core material 1A molded using the molding apparatus 10A has a plurality of bottomed holes 7A formed by comb teeth 33A at the front thereof.
[0050]
(2) Like the partition means 30B shown in FIG. 11, at least one of the raw material beads filled in the partition molding space adjacent to the movable partition member 31 and the cavity mold 12 is spaced in the mold opening / closing direction with an interval through which it cannot pass. You may provide the comb-shaped partition members 40 and 41 which consist of several comb-tooth 33B extended in the shape of a hand. In this case, by arranging the tips of the comb teeth 33B of the comb-shaped partition members 40 and 41 so as to overlap in the mold opening / closing direction, the length of the comb teeth 33B can be set roughly as in the above-described molding apparatus 10A. And can easily handle cracking filling. Moreover, since a short comb tooth 33B can be adopted, it is possible to improve the releasability of the molded product and to set a small bending moment acting on the comb tooth, so it is possible to adopt a small comb tooth. Thus, the bottomed hole formed in the molded product by the comb teeth 33B can be configured as small as possible.
Further, when the molded product is released, the pulling force of the comb-like partition members 40 and 41 can be applied to the molded product in a well-balanced manner, so that the release property of the molded product can be improved and the molded product at the time of release can be improved. Damage can be prevented. The core material molded using the partitioning means 30 has a plurality of bottomed holes formed at the front and rear portions thereof corresponding to the comb teeth 33B.
As a method of dividing the comb teeth for the movable partition member 31 and the cavity mold 12, for example, a comb composed of a plurality of comb teeth 33 arranged in the horizontal direction on the movable partition member 31 as in the partition means 30C shown in FIG. Any partitioning method can be employed, such as providing the partition member 42 and providing the cavity mold 12 with a comb partition member 43 including a plurality of comb teeth 33 arranged in the vertical direction.
[0051]
(3) Like the molding apparatus 10D shown in FIG. 13, the comb teeth 33 are omitted, and the tip of the movable partition member 31D is formed into a shape that fits the molding surface of the cavity mold 12, and fixed to the movable partition member 31D. A partitioning means 30 </ b> D that partitions the molding space 13 with the partition member 35 may be provided. In this case, when the movable partition member 31 </ b> D is retracted, its front part is projected into the molding space 13 so that the tip part along the cavity mold 12 does not move toward the flange side of the insertion hole 36. The raw material beads are prevented from entering the insertion hole 36, and burrs are prevented from being formed along the insertion hole 36.
As shown in FIG. 14, the core material 1B molded by the molding apparatus 10D is provided with a groove 7D that fits the front end side portion of the movable partition member 31D at the rear of the core material 1D.
[0052]
(4) Instead of the movable partition member 31 and the comb teeth 33, as in the molding apparatus 10E shown in FIG. 15, the first movable partition member 31E is provided in the core mold 11 so as to be able to protrude and retract, and the tip portion has a core shape. A first movable partition member 31E formed in a shape suitable for the molding surface of the mold 11 and a second movable partition member 44 provided in a cavity mold 12 so as to be able to protrude and retract, wherein the shape of the tip portion is the molding surface of the cavity mold 12 A core through which the first movable partition member 31E is inserted is provided with a second movable partition member 44 formed in a shape conforming to the above, and actuators 32E and 45 composed of air cylinders and the like that respectively drive the movable partition members 31E and 44 forward and backward. The first insertion hole 36E of the mold 11 and the second insertion hole 46 of the cavity mold 12 through which the second movable partition member 44 is inserted are configured in the same shape, and both the insertion holes 36E, 46 are opened and closed by the same mold You may provide the partition means 30E arrange | positioned in the direction position. When the molding space 13 is partitioned in the molding apparatus 10E, as shown in FIG. 15B, the first movable partition member 31E or the second movable partition member 44 is protruded into the molding space 13, and the molding space 13 is partitioned. When the distal end portion is inserted into the second insertion hole 46 or the first insertion hole 36E until the molding space 13 is not partitioned, the first movable partition member 31E is moved to the distal end portion as shown in FIG. Is retracted until it is flush with the molding surface of the core mold 11, and the second movable partition member 44 is retracted until its tip is flush with the molding surface of the cavity mold 12. The movable partition members 31 </ b> E and 44 are closed so that no burrs are formed along the insertion holes 36 </ b> E and 46. In addition, the core material molded using the molding apparatus 10E is a molded product in which the bottomed hole 7 and the through hole are not formed at the boundary between the low foaming portion and the high foaming portion and the entire surface is in close contact.
[0053]
As shown in FIG. 16, an in-mold foam molding apparatus 50 in which the vent holes 18 are completely or substantially completely omitted from the core mold 11 and the cavity mold 12 can be adopted as the in-mold foam molding apparatus. . In this case, even when the core mold 11 and the cavity mold 12 are closed, a clearance 51 that opens into the molding space 13 is formed along the joint between the molds 11 and 12, and the clearance 51 is interposed therebetween. Thus, a working fluid such as steam is supplied into the molding space 13 independently of the chambers 16 and 17, and drains and the like are discharged from the molding space 13. In such a molding apparatus 50, the core material 1 having a beautiful surface with no trace of the air holes 18 can be manufactured, and the strength of the molds 11 and 12 can be prevented from being reduced due to the formation of the air holes 18. , 12 can be made thin so that the heat capacity can be set small, the heat efficiency of heating and cooling can be improved, the accuracy of temperature control can be improved, and the processing cost for forming the vent hole 18 is greatly reduced. The manufacturing cost of the molds 11 and 12 can be reduced, the heating failure due to the clogging of the vent hole 18, the mold release failure, the cooling failure does not occur, the core vent 19 is replaced, or the high-pressure cleaning water is periodically cleaned. This eliminates the need for maintenance work, and the cooling water used in the cooling process does not enter the molding space 13, so that the moisture in the core material 1 is reduced from about 6 to 10% of the conventional one. Can decrease to about 5-2%, the drying process becomes unnecessary, can contribute greatly to shorten the cycle time, effects such as are obtained. In addition, it can replace with the partition means 30 and can also provide the partition means 30A-30E.
[0054]
In addition, although the present Example demonstrated the in-mold foam molding apparatus for manufacturing the core material 1 of a bumper for motor vehicles as an in-mold foam-molded product, it is with respect to the molding apparatus which manufactures molded products other than the core material 1. The present invention can be similarly applied.
[0055]
Next, an example of the molding method of the core material 1 using the foam molding apparatus 10 shown in FIG. 3 will be described.
First, in order to fill the partition molding spaces 13A and 13B with the raw material beads, the core mold 11 and the cavity mold 12 are closed, the movable partition member 31 is moved to the forward movement position, and the movable partition member 31 and the fixed partition member 35 are moved. The comb-shaped partition member 34 divides the molding space 13 into three partition molding spaces 13A and 13B.
[0056]
Next, raw material beads having a diameter larger than the gap between the comb teeth 33 and different characteristics are separately supplied from the filling device 14 to the compartment molding spaces 13A and 13B on the air flow. The raw material beads are filled inside. In this embodiment, in order to mold the core material 1 of the automobile bumper, the raw material beads having a foaming ratio of 5 times are filled in the partition molding spaces 13A and 13B, and the raw material beads having a foaming ratio of 20 times are filled in the partition molding space 13A. , 13B. However, the expansion ratio of the raw material beads can be arbitrarily set in consideration of the strength of the core material 1 and the like. In addition, depending on the use of the molded product, raw material beads having different characteristics other than the expansion ratio, for example, raw material beads having different characteristics such as bead bulk density, cell diameter, bead diameter, and raw material can be filled. In addition, when using raw material beads made of polyolefin resin as raw material beads, before filling the raw material beads, the raw material beads are filled in a containing tank (not shown) to form an inorganic material of 0.03 to 0.2 MPa. You may comprise so that the foaming power of a raw material bead may be improved by press-fitting gas into a raw material bead. As a specific filling method of the raw material beads, a known filling method such as a cracking filling method, a pressure filling method, and a compression filling method can be employed.
[0057]
Next, after filling the partition forming spaces 13A and 13B with the raw material beads, the movable partition member 31 is moved back to the retracted position as shown in FIG. The insertion hole 36 of the core mold 11 is closed with the movable partition member 31 so as to be flush with the molding surface. At this time, the comb-shaped partition member 34 remains in a protruding state in the molding space 13.
[0058]
Next, steam is supplied to the molding space 13 through the chambers 16 and 17 and the vent hole 18 to heat the raw material beads, and then the raw material beads are foamed by releasing the vapor pressure so that the raw material beads are substantially free of gaps. It will be fused to each other. At this time, if air remains between the raw material beads, the adhesion between the raw material beads decreases, and therefore, the operation of replacing the air in the chambers 16 and 17 and the molding space 13 with steam is performed in advance. At this time, also at the corresponding position of the comb-shaped partition member 34, the raw material beads filled in the adjacent partition forming spaces 13A and 13B are fused to each other through the gap between the comb teeth 33. Further, the bottomed hole 7 is formed at a position corresponding to the comb tooth 33, and the insertion hole 36 is closed by the movable partition member 31 as described above, so that the raw material beads are prevented from entering the insertion hole 36. Thus, burrs are prevented from being formed at positions corresponding to the insertion holes 36.
[0059]
Next, cooling water is sprayed from a nozzle (not shown) toward the core mold 11 and the cavity mold 12 to cool the core material 1 in the molding space 13, and then the molds 11 and 12 are opened, and the mold is not shown. The core material 1 is released from the cavity mold 12 using the ejector pins. Since the comb blade 33 is arranged on the core mold 11 side and the mold release resistance of the molded product on the core mold 11 side is likely to increase, the molds 11 and 12 are attached so that the molded product remains reliably in the cavity mold 12. Before opening the mold, the movable partition member 31 may be further moved backward to extract the comb teeth 33 from the molded product.
[0060]
When the first raw material beads having a diameter that cannot pass between the comb teeth 33 and the second raw material beads that can pass between the comb teeth 33 are used as the raw material beads, the forming space 13 is filled with the raw material beads. Sometimes, after filling the first raw material beads into the compartment molding spaces 13A and 13B, the second raw material beads are filled into the compartment molding spaces 13A and 13B. In this case, part of the first raw material beads moves between the comb teeth 33 and into the partition molding spaces 13A and 13B, so that the adhesion between the first raw material beads and the second raw material beads can be further improved. It becomes possible.
[0061]
In the case of molding using the molding apparatus 10E shown in FIG. 15, when the molding space 13 is partitioned into three partition molding spaces 13A and 13B, as shown in FIG. The partition member 31E is moved to the forward position, the second movable partition member 44 is moved to the retracted position, the molding space 13 is partitioned by the first movable partition member 31E, and the tip of the first movable partition member 31E is moved to the first position. The first movable partition member 31 </ b> E is supported at both ends by being inserted into the two insertion holes 46. In addition, when the raw material beads are heat-sealed with steam, as shown in FIG. 15A, the movable partition members 31E and 44 have their distal ends on the molding surface of the core mold 11 and the molding surface of the cavity mold 12, respectively. The steam is supplied after the insertion holes 36E and 46 are closed by the movable partition members 31E and 44, respectively, by moving them so as to be flush with each other.
[0062]
Further, when molding is performed using the in-mold foam molding apparatus 50 as shown in FIG. 16, the core mold 11 and the cavity mold in which the air holes 18 are not formed in the molding portion for molding a conspicuous place on the outer surface of the core material 1. 12 is used, the filling air supplied into the molding space 13 together with the raw material beads is discharged to the outside of the molding space 13 through the clearance 51 when the raw material beads are filled. Further, when the raw material beads are heated and fused with steam, the steam is supplied to the chambers 16 and 17 and the steam is supplied into the molding space 13 through the clearance 51.
In the present embodiment, the molding method for molding the core material 1 of the bumper for automobiles has been described. However, the present invention can be similarly applied to molding an in-mold foam molded product other than the core material 1.
[0063]
【The invention's effect】
According to the first to third in-mold foam molding apparatuses according to the present invention, since the raw material beads having different characteristics can be filled in the adjacent compartment molding spaces, the formation position and size of the compartment molding spaces, the raw material beads to be filled By appropriately setting the characteristics, the performance and quality of the molded product can be improved. In addition, the movable partition member prevents the raw material beads from entering the insertion hole when the raw material beads are heat-sealed, thereby reliably preventing the occurrence of burrs at the position where the insertion hole is provided. Furthermore, in the partition portion by the comb teeth, it is possible to enter and exit fluids such as air and steam for filling of the raw material beads and heat fusion, and therefore, when filling the raw material beads, variation in the packing density of the raw material beads is minimized. It can be set, and at the time of heat fusion of the raw material beads, it becomes possible to allow the steam to act uniformly on the raw material beads, thereby improving the quality of the molded product.
[0064]
Moreover, in the second in-mold foam molding apparatus, the length of the comb teeth can be set roughly. Moreover, in the third in-mold foam molding apparatus, effects such as that the bottomed hole formed in the molded product can be configured to be as small as possible and that the mold releasability of the molded product can be improved are obtained.
[0065]
Here, when the comb teeth are made of a material that can be elastically deformed, the original shape is restored even if the comb teeth are slightly deformed by filling pressure or foaming pressure, so that it is possible to prevent molding defects due to plastic deformation of the comb teeth. By setting the cross-sectional area of the comb teeth as small as possible, it is possible to suppress deterioration in appearance and strength of the molded product.
[0066]
In addition, when the partition member is fixed to the mold having the ejector pins, when the mold is opened, the molded product can be left on the mold side having the ejector pins, and the mold side having no ejector pins. Therefore, it is possible to effectively prevent a mold release failure due to the remaining product.
[Brief description of the drawings]
FIG. 1 is a perspective view of a core material of an automobile bumper.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a longitudinal sectional view of an in-mold foam molding apparatus.
FIG. 4 is a longitudinal sectional view of a mold near a vent hole
FIG. 5 is a front view of the core vent.
FIG. 6 is an explanatory diagram of partitioning means.
FIG. 7 is an operation explanatory diagram of the partition means.
FIG. 8 is a longitudinal sectional view of an in-mold foam molding apparatus provided with partitioning means having another configuration.
FIG. 9 is an operation explanatory diagram of the partitioning means.
FIG. 10 is a longitudinal sectional view of a core material molded by the molding apparatus.
FIG. 11 is an explanatory diagram of partitioning means having another configuration.
FIG. 12 is an explanatory diagram of partitioning means having another configuration.
FIG. 13 is a longitudinal sectional view of an in-mold foam molding apparatus provided with partitioning means having another configuration.
FIG. 14 is a longitudinal sectional view of a core material molded by the molding apparatus.
FIGS. 15A and 15B are explanatory views when the movable partition member is retracted, and FIG. 15B is an explanatory view when the molding space is partitioned, of the in-mold foam molding apparatus provided with partitioning means having other configurations.
FIG. 16 is a longitudinal sectional view of another molding apparatus.
[Explanation of symbols]
1 Core material 2 Front shock absorber
3 Side shock absorber 4 Corner
5 Low foaming part 6 High foaming part
7 Bottomed hole
10 In-mold foam molding equipment 11 Core mold
12 Cavity mold 13 Molding space
14 Filler 15 Housing
16 First chamber 17 Second chamber
18 Vent 19 Core vent
19b Slit 19a Round hole
20 Core vent mounting hole 21 Core vent hole
22 Supply pipe 23 Discharge pipe
30 partition means 31 movable partition member
32 Actuator 33 Comb teeth
34 Comb-shaped partition member 35 Fixed partition member
36 Insertion hole 37 Horizontal wall
38 Vertical wall
1A Core material 7A Bottomed hole
10A Molding device 13A Compartment molding space
30A partition means 31A movable partition member
33A comb teeth 34A comb-shaped partition member
30B Partition means 40 Comb-shaped partition member
41 Comb-shaped partition member
30C partition means 42 comb-shaped partition member
43 Comb-shaped partition member
1D core material 7D groove
10D molding machine 13D section molding space
30D partitioning means 31D movable partition member
30E partition means 31E first movable partition member
36E insertion hole 44 2nd movable partition member
45 Actuator 46 Insertion hole
50 In-mold foam molding equipment 51 Clearance

Claims (5)

第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に形成するとともに、可動仕切部材の先端部に、隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけて型開閉方向に片持ち状に延びる複数の櫛歯を設け、これら複数の櫛歯の先端が第１金型に組み合わされる第２金型の成形面に適合した形状となるように形成し、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着することを特徴とする型内発泡成形装置。  A movable partition member for partitioning the molding space into a plurality of partition molding spaces is provided in the first mold so as to be able to protrude and retract, and a tip portion of the movable partition member is formed in a shape suitable for the molding surface of the first mold. A plurality of comb teeth extending in a cantilevered manner in the mold opening and closing direction are provided at the distal end portion of the movable partition member at intervals at which at least one of the raw material beads filling the adjacent partition molding space cannot pass through, The tip of the comb teeth is formed to have a shape suitable for the molding surface of the second mold to be combined with the first mold, and the movable partition member protrudes into the molding space, and a plurality of sections are formed in the molding space. In the state of being partitioned into the molding space, the raw material beads are filled in the partition molding space, and then the raw material beads are heated and melted with the movable partition member retracted until the tip of the movable partition member is flush with the molding surface. Inside mold characterized by wearing Foam molding apparatus. 第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に構成し、第１金型に組み合わされる第２金型に、可動仕切部材を突出させた状態で、可動仕切部材と第２金型の成形面間における原料ビーズの通り抜けを規制する櫛歯を、可動仕切部材に対面させ且つ隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけて、型開閉方向に片持ち状に複数設け、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着することを特徴とする型内発泡成形装置。  A movable partition member for partitioning the molding space into a plurality of partition molding spaces is provided in the first mold so as to be able to appear and retract, and the tip of the movable partition member is configured in a shape suitable for the molding surface of the first mold. In the state where the movable partition member protrudes from the second mold combined with the first mold, the comb teeth for restricting the passing of the raw material beads between the molding surfaces of the movable partition member and the second mold are moved to the movable partition. A plurality of cantilevered beads are provided in the mold opening and closing direction at intervals so that at least one of the raw material beads filling the adjacent partition molding space can not pass through, and the movable partition member projects into the molding space. In the state where the molding space is partitioned into a plurality of partition molding spaces, the raw material beads are filled into the partition molding space, and then the movable partition member is retracted until the tip of the movable partition member is flush with the molding surface. Heat raw material beads in state Mold foam molding apparatus characterized by wear. 第１金型に成形空間内を複数の区画成形空間に区画するための可動仕切部材を出没自在に設け、前記可動仕切部材の先端部を第１金型の成形面に適合した形状に構成し、可動仕切部材の先端部と第１金型に組み合わされる第２金型とに、第２金型の成形面と可動仕切部材間における原料ビーズの通り抜けを規制する櫛歯を、隣接する区画成形空間に充填する原料ビーズの少なくとも一方が通り抜け不能な間隔をあけ、先端部を相互にラップさせて型開閉方向に片持ち状に複数設け、前記可動仕切部材を成形空間内へ突出させて、成形空間内を複数の区画成形空間に区画した状態で、区画成形空間内に原料ビーズを充填し、その後可動仕切部材の先端部が成形面と面一になるまで可動仕切部材を後退させた状態で、原料ビーズを加熱融着することを特徴とする型内発泡成形装置。  A movable partition member for partitioning the molding space into a plurality of partition molding spaces is provided in the first mold so as to be able to appear and retract, and the tip of the movable partition member is configured in a shape suitable for the molding surface of the first mold. Comb teeth that restrict the passage of the raw material beads between the molding surface of the second mold and the movable partition member are adjacently formed into the second mold combined with the tip of the movable partition member and the first mold. At least one of the raw material beads filling the space is spaced so that it cannot pass through, and the tip portions are overlapped with each other to provide a plurality of cantilevers in the mold opening and closing direction, and the movable partition member protrudes into the molding space to form In a state where the space is partitioned into a plurality of partition molding spaces, the raw material beads are filled in the partition molding space, and then the movable partition member is retracted until the tip of the movable partition member is flush with the molding surface. , Heat fusion of raw material beads Mold foam molding apparatus according to claim. 前記櫛歯を弾性変形可能な素材で構成した請求項１〜３のいずれか１項記載の型内発泡成形装置。  The in-mold foam molding apparatus according to claim 1, wherein the comb teeth are made of a material that can be elastically deformed. エジェクタピンを有する金型側に櫛歯を設けた請求項１又は２記載の型内発泡成形装置。  The in-mold foam molding apparatus according to claim 1 or 2, wherein comb teeth are provided on a mold side having an ejector pin.
JP2000374872A 2000-12-08 2000-12-08 In-mold foam molding equipment Expired - Fee Related JP4576708B2 (en)

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JP5104243B2 (en) * 2007-11-15 2012-12-19 株式会社カネカ In-mold foam molding equipment
CN103507198A (en) * 2013-09-22 2014-01-15 苏州市佳腾精密模具有限公司 Foaming mold and composite foam forming method

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