JP3920991B2 - Mold for compression molding - Google Patents

Mold for compression molding Download PDF

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Publication number
JP3920991B2
JP3920991B2 JP19321598A JP19321598A JP3920991B2 JP 3920991 B2 JP3920991 B2 JP 3920991B2 JP 19321598 A JP19321598 A JP 19321598A JP 19321598 A JP19321598 A JP 19321598A JP 3920991 B2 JP3920991 B2 JP 3920991B2
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Prior art keywords
mold
sliding body
angular pin
synthetic resin
mold clamping
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JP19321598A
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Japanese (ja)
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JP2000025061A (en
Inventor
健二 鈴木
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Gifu Plastic Industry Co Ltd
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Gifu Plastic Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、射出成形機から射出された溶融した合成樹脂が金型内に所定量充填した後、更に型締めして成形するための圧縮成形用金型に関するものである。
【０００２】
【従来の技術】
従来から、溶融状態にある合成樹脂を金型を構成する下型上に押出し機により所定量供給し、その後に型締めしてプレス成形するものが例えば特開昭５９−１０１３２２号公報により知られている。
【０００３】
上記の従来例において、孔を備えた成形品を形成するには下型から孔成形用のピンを突設し、プレスのために型締めをした際にピンの先端部が上型に当接するようになっている。ところが、溶融した合成樹脂を供給する時からプレスのために最終型締めする直前までピンの先端部と上型との間には隙間があるため、下型上に充填する合成樹脂がピンの先端部と上型との間に入り込むおそれがあり、このような場合には成形して得られた成形品の孔部分にバリが生じ、商品価値が低下し、また、後でバリ取りをする必要があるという問題があった。
【０００４】
【発明が解決しようとする課題】
本発明は上記の点に鑑みてなされたものであり、圧縮成形により孔を有する成形品を成形するに当って、バリの発生のない正確な孔を形成できる圧縮成形用金型を提供することを課題とするものである。
【０００５】
【課題を解決するための手段】
上記課題を解決するために本発明に係る圧縮成形用金型は、上金型１と下金型２とからなる金型３においていずれか一方の金型３が上下方向に移動し、その型締めが、射出成形機４から射出された合成樹脂５が内部に所定量充填される第１の型締め段階と、金型３内に充填された所定量の合成樹脂５を圧縮して成形するための第２の型締め段階との２段階よりなり、上金型１乃至下金型２の少なくとも一方からキャビティ６内に摺動体７を突出し、この摺動体７の先端部を第１の型締め段階における合成樹脂の充填時から第２の型締め段階における合成樹脂５の圧縮成形時まで継続して対向する金型３内面に押し当てるための摺動体押し当て手段８を設けて成る金型であって、上金型１乃至下金型２の一方の側周部の内周部にキャビティ６の一部を構成する凹溝部２４を形成し、凹溝部２４を設けた方の金型の上記側周部に対して近づいたり、離れたりするように横方向に移動自在なスライド部材２６をスライド自在に設け、該スライド部材２６に傾斜したアンギュラピン挿入孔３１を設けると共に、上金型１乃至下金型２の他方に上記アンギュラピン挿入孔３１に挿入自在な傾斜したアンギュラピン３２を突設して型締めの進行と共にアンギュラピン３２がアンギュラピン挿入孔３１内に差し込まれてスライド部材２６が該スライド部材２６を設けた方の金型に近づく方向に移動するように設定し、上記アンギュラピン挿入孔３１に挿入自在な傾斜したアンギュラピン３２を突設して型締めの進行と共にアンギュラピン３２がアンギュラピン挿入孔３１内に差し込まれてスライド部材２６が上記側周部に近づく方向に移動するように設定し、スライド部材２６に一方の金型内に出没自在な摺動体７を横方向に移動自在に設けると共に、摺動体７を上記側周部の横孔２７に挿入し、摺動体７をスライド部材２６から突出する方向に弾性付勢するためのバネ２２を設けて摺動体押し当て手段を上記バネ２２と、アンギュラピン３２及びアンギュラピン挿入孔３１により構成し、第１の型締め段階においてアンギュラピン３２のアンギュラピン挿入孔３１への差し込み量を、バネ２２により突出方向である横方向に弾性付勢された摺動体７の先端部が凹溝部２４内に突入して凹溝部２４の内側面に押し当てられるように設定すると共に、摺動体７の先端部を第１の型締め段階から第２の型締め段階に到るにしたがって継続して摺動体７の先端部が凹溝部２４の内側面に弾性的に押し当てられた状態を保持しながらスライド部材２６が上記側周部により近づくように移動するように設定して成ることを特徴とするものである。このような構成とすることで、射出成形機４から射出された合成樹脂５が内部に所定量充填する際、充填後、第２の型締め段階における合成樹脂５の圧縮成形が終わるまで摺動体７の先端面と摺動体７を突出している方と反対側の上金型１乃至下金型２との間に隙間ができず、この間に合成樹脂が入り込むことがなく、バリの発生しない孔を備えた成形品を得ることができるものであり、また、型締めの進行に伴って摺動体７の先端部のバネ２２による金型３内面への押し当て力が次第に大きくなっていって、摺動体７の先端部と金型３内面との間に合成樹脂がよりいっそう入り込まないようにできるものである。
【０００８】
【発明の実施の形態】
以下、本発明を添付図面に示す実施形態に基づいて説明する。
【０００９】
金型３は上金型１と下金型２とで構成してあり、上金型１又は下金型２のいずれか一方が固定型となっており、いずれか他方が可動型となっている。添付図面に示す実施形態では上金型１が固定型、下金型２が可動型の例が示してある。固定型（すなわち図においては上金型１）は固定側プレス機９に固定側取り付け板９ａを介して取り付けてあり、この固定型にはホットランナ１０が設けてあり、射出成形機４から溶融した合成樹脂がホットランナ１０の先端部のゲート１１部分から金型３内に供給されるようになっている。可動型（すなわち図においては下金型２）は可動側プレス機１２に可動側取り付け板１２ａを介して取り付けてある。
【００１０】
上金型１と下金型２とで構成される金型３は型締めが、射出成形機４から射出された合成樹脂５が内部に所定量充填される第１の型締め段階と、金型３内に充填された所定量の合成樹脂５を圧縮して成形するための第２の型締め段階との２段階よりなっている。
【００１１】
上金型１乃至下金型２の少なくとも一方からキャビティ６内に摺動体７を突出してある。添付図面においては可動型である下金型２側に第１の摺動体７ａを設け、固定型である上金型２側に第２の摺動体７ｂを設けてある。
【００１２】
まず、第１の摺動体７ａについて説明する。添付図面に示すように、下金型２には上方に突出する突部２９が設けてあり、下金型２の突部２９部分に設けた孔部１４には段付きのカラー１５が設けてあり、カラー１５の上端面が下金型２の上面と面一となっている。カラー１５内には第１の１摺動体７ａが上下移動自在に内装してあり、第１の摺動体７ａの上部がカラー１５に設けた孔１６から上方に突出している。カラー１５の下端開口部にはキャップ１７がボルトにより着脱自在に取り付けてあり、キャップ１７にはピンガイド１９が突設してあって、第１の摺動体７ａの下方に開口するガイド穴２０にピンガイド１９が摺動自在に嵌め込んである。更に、キャップ１７のガイド穴２０に連続しガイド穴２０より下部で且つ大径のバネ嵌め込み孔部２１にコイルスプリングよりなるバネ２２の上部を嵌め込んであってバネ２２の上端がバネ嵌め込み孔部２１の上底部に当接してあり、また、バネ２２の下端部がキャップ１７の上面部に当接してあって、上下移動自在な第１の摺動体７ａを上方に弾性付勢してある。そして、第１の摺動体７ａは第１の型締め段階における合成樹脂の充填時から第２の型締め段階における合成樹脂５の圧縮成形時まで継続して対向する上金型１の下面に上記バネ２２により弾性的に押し当てられている。したがって、本実施形態においてはバネ２２により摺動体押し当て手段８が構成してある。
【００１３】
次に、第２の摺動体７ｂにつき説明する。固定型である上金型１は側周部に下方に向けて垂下壁２３を設けてあり、垂下壁２３の内周部には上金型１の下面部よりも上方に向けて凹溝部２４を形成してある。垂下壁２３の外側には垂下壁２３に対して近づいたり、離れたりするように移動自在なスライドブロック２５がスライド自在に設けてある。スライドブロック２５はスライド部材２６に前述と同じカラー１５を設けて構成してある。カラー１５には第２の摺動体７ｂを横方向に摺動自在に設け、また、前述と同様にキャップ１７、ピンガイド１９、バネ２２を設けて、バネ２２により第２の摺動体７ｂをカラー１５より側方に突出させ、この第２の摺動体７ｂを垂下壁２３の横孔２７に挿入してあり、上金型１と下金型２よりなる金型３を型開きした場合、摺動体７ｂの先端が横孔２７内に位置している。ここで、カラー１５、キャップ１７、ピンガイド１９、バネ２２、第２の摺動体７ｂ（第１の摺動体７ａに相当する）の相互の関係は前述と同じなので重複する説明は省略する。スライド部材２６には下に行くほど内側となるように斜め下方に向けて開口したアンギュラピン挿入孔３１が設けてある。一方、下金型２の突部２９の側部の段部３０には斜め外上方に向けてアンギュラピン３２が突設してあり、可動型である下金型２を上方に移動して型締めしていくと、アンギュラピン３２がアンギュラピン挿入孔３１に差し込まれ、これによりスライド部材２６がアンギュラピン３２にガイドされながら垂下壁２３側に移動し、第２の摺動体７ｂを凹溝部２４内に突入させ、少なくとも第１の型締め段階における合成樹脂の充填時には第２の摺動体７ｂの先端部が凹溝部２４の内側面に弾性的に押し当てられ、この第１の型締め段階における合成樹脂の充填が終わった後に下金型２を更に移動して第２の型締め段階における合成樹脂５の圧縮成形となっても継続して第２の摺動体７ｂの先端部が凹溝部２４の内側面に弾性的に押し当てられるようになっている。したがって、本実施形態においてはバネ２２と、アンギュラピン３２及びアンギュラピン挿入孔３１とにより摺動体押し当て手段８が構成してある。
【００１４】
しかして、上記のような構成の金型３を用いて合成樹脂成形品３５を成形するには以下のようにして行うものである。
【００１５】
図１は型締め前の状態を示している。この型締め前の段階から図２に示すように可動型である下金型２を上方に移動してハーフ型締めを行う。このハーフ型締めが第１の型締め段階であり、下金型２の突部２９が上金型１の垂下壁２３の最下端部の内面にわずかに嵌め込まれる。この第１の型締め段階においては第１の摺動体７ａ及び第２の摺動体７ｂの先端部がいずれも摺動体押し当て手段８により対向する上金型１又は下金型２に（つまり金型３内面に）押し当てられるものである。この第１の型締め段階の状態で、図３に示すように射出成形機４から射出された溶融した合成樹脂５がホットランナ１０を介して金型３内（つまりキャビティ６内）に所定量供給されて充填される。次に、図４に示すように可動型である下金型２を上方に移動させて充填された合成樹脂５を圧縮成形する。この場合、型締め圧＞射出圧となる条件で型締めをして圧縮成形を行うものである。そして、第１の摺動体７ａ、第２の摺動体７ｂの先端部がいずれも摺動体押し当て手段８の働きにより上記第１の型締め段階における合成樹脂の充填時から第２の型締め段階における合成樹脂５の圧縮成形時まで継続して対向する金型３内面に押し当てるので、第１の摺動体７ａ、第２の摺動体７ｂの先端部と金型３内面との間に合成樹脂が入り込むことがないものである。
【００１６】
ここで、第１の型締め段階から第２の型締め段階に到る工程で移動型である下金型２が上金型１に近づくように移動するとき、第１の摺動体７ａの先端部がバネ２２により金型３内面に弾性的に押し当てられた状態を保持しながら第１の摺動体７ａがバネ２２のバネ力に抗してカラー１５内に後退していくが、下金型２が上昇して型締めが進む程バネ２２による第１の摺動体７ａの先端部の金型３内面への押当力は大きくなる。また、第１の型締め段階から第２の型締め段階に到る工程で移動型である下金型２が上金型１に近づくように移動するとき、第２の摺動体７ｂの先端部がバネ２２により金型３内面に弾性的に押し当てられた状態を保持しながらスライド部材２６が垂下壁２３側に近づくので、下金型２が上昇して型締めが進む程バネ２２による第２の摺動体７ｂの先端部の金型３内面への押当力は大きくなる。したがって、型締めが進む程摺動体７の金型３内面への密着力が大きくて摺動体７の先端部と金型３内面との間にいっそう合成樹脂が入り込むことがないものである。
【００１７】
上記のようにして圧縮成形が終わると、図５→図６→図７の順序で下金型２を下方に移動して型開きを行って、図７に示すように成形された合成樹脂成形品３５を取り出すものである。しかして得られた合成樹脂成形品３５には摺動体７により形成された孔３６を備えたものであり、この孔３６は前述のように、第１の型締め段階における合成樹脂の充填時、第１の型締めの段階から第２の型締めの段階に到る際に摺動体７の先端部が金型１内面に摺動体押し当て手段８により継続して押し当てられているので、摺動体７の先端部と金型３内面との間に合成樹脂が入り込まず、したがって、合成樹脂成形品３５に形成された孔３６にバリ等が発生しないものが得られるものである。
【００１８】
【発明の効果】
本発明にあっては、上述のように、上金型と下金型とからなる金型においていずれか一方の金型が上下方向に移動し、その型締めが、射出成形機から射出された合成樹脂が内部に所定量充填される第１の型締め段階と、金型内に充填された所定量の合成樹脂を圧縮して成形するための第２の型締め段階との２段階よりなり、上金型乃至下金型の少なくとも一方からキャビティ内に摺動体を突出し、この摺動体の先端部を第１の型締め段階における合成樹脂の充填時から第２の型締め段階における合成樹脂の圧縮成形時まで継続して対向する金型内面に押し当てるための摺動体押し当て手段を設けてあるので、射出成形機から射出された合成樹脂が内部に所定量充填する際、充填後、第２の型締め段階における合成樹脂の圧縮成形が終わるまで摺動体の先端面と摺動体を突出している方と反対側の上金型乃至下金型との間に隙間ができず、この間に合成樹脂が入り込むことがなく、バリの発生しない孔を備えた成形品を簡単な構成の金型により得ることができるものである。しかも、上金型乃至下金型の一方の側周部の内周部にキャビティの一部を構成する凹溝部を形成し、凹溝部を設けた方の金型の上記側周部に対して近づいたり、離れたりするように横方向に移動自在なスライド部材をスライド自在に設け、該スライド部材に傾斜したアンギュラピン挿入孔を設けると共に、上金型乃至下金型の他方に上記アンギュラピン挿入孔に挿入自在な傾斜したアンギュラピンを突設して型締めの進行と共にアンギュラピンがアンギュラピン挿入孔内に差し込まれてスライド部材が上記側周部に近づく方向に移動するように設定し、スライド部材に一方の金型内に出没自在な摺動体を横方向に移動自在に設けると共に、摺動体を上記側周部の横孔に挿入し、摺動体をスライド部材から突出する方向に弾性付勢するためのバネを設けて摺動体押し当て手段を上記バネと、アンギュラピン及びアンギュラピン挿入孔により構成し、第１の型締め段階においてアンギュラピンのアンギュラピン挿入孔への差し込み量を、バネにより突出方向である横方向に弾性付勢された摺動体の先端部が凹溝部内に突入して凹溝部の内側面に押し当てられるように設定すると共に、摺動体の先端部を第１の型締め段階から第２の型締め段階に到るにしたがって継続して摺動体の先端部が凹溝部の内側面に弾性的に押し当てられた状態を保持しながらスライド部材が上記側周部により近づくように移動するように設定してあるので、バネにより横方向に弾性付勢された摺動体の先端部がスライド部材を設けた一方の金型の側周部の内周部に設けたキャビティの一部を構成する凹溝部の内側面に押し当てられた状態で、型締めの進行に伴って、摺動体の先端部のバネによる上記凹溝部の内側面への押し当て力が次第に大きくなっていって、摺動体の先端部と上記凹溝部の内側面との間に合成樹脂がよりいっそう入り込まないようにでき、この結果、バリの発生しない孔を備えた成形品を簡単な構成の金型により得ることができるものである。
【図面の簡単な説明】
【図１】本発明の一実施形態の型締め前の状態の断面図である。
【図２】同上のハーフ型締めの状態の断面図である。
【図３】同上の射出成形の状態を示す断面図である。
【図４】同上の圧縮成形の状態を示す断面図である。
【図５】同上の型開きの初期の状態を示す断面図である。
【図６】同上の更に型開きが進行した状態を示す断面図である。
【図７】同上の更に型開きが完了して合成樹脂成形品を取り出す状態を示す断面図である。
【符号の説明】
１ 上金型
２ 下金型
３ 金型
４ 射出成形機
５ 合成樹脂
６ キャビティ
７ 摺動体
８ 摺動体押し当て手段
２２ バネ
２６ スライド部材
３１ アンギュラピン挿入孔
３２ アンギュラピン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compression molding die for filling a mold with a predetermined amount of molten synthetic resin injected from an injection molding machine and then molding the mold by further clamping.
[0002]
[Prior art]
Conventionally, for example, Japanese Patent Laid-Open No. 59-101322 discloses a method in which a predetermined amount of synthetic resin in a molten state is supplied onto a lower mold constituting a mold by an extruder, and thereafter is clamped and press-molded. ing.
[0003]
In the above conventional example, in order to form a molded product having a hole, a pin for hole formation protrudes from the lower mold, and when the mold is clamped for pressing, the tip of the pin comes into contact with the upper mold It is like that. However, since there is a gap between the tip of the pin and the upper die from when the molten synthetic resin is supplied until just before final clamping for pressing, the synthetic resin that fills the lower die is the tip of the pin. In such a case, burrs are generated in the hole part of the molded product obtained by molding, and the commercial value is lowered, and it is necessary to deburr later. There was a problem that there was.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and provides a compression molding die capable of forming an accurate hole free of burrs when molding a molded product having a hole by compression molding. Is an issue.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a compression molding mold according to the present invention includes a mold 3 composed of an upper mold 1 and a lower mold 2, and one of the molds 3 moves in the vertical direction, and the mold The clamping is performed by compressing and molding a first mold clamping stage in which a predetermined amount of the synthetic resin 5 injected from the injection molding machine 4 is filled, and a predetermined amount of the synthetic resin 5 filled in the mold 3. And a second mold clamping stage. The sliding body 7 protrudes into the cavity 6 from at least one of the upper mold 1 to the lower mold 2, and the tip of the sliding body 7 is used as the first mold. A mold provided with sliding body pressing means 8 for pressing against the inner surface of the opposing mold 3 continuously from the filling of the synthetic resin in the clamping stage to the compression molding of the synthetic resin 5 in the second clamping stage. a is, the cavity 6 the inner peripheral portion of one of the side periphery of the upper die 1 to the lower mold 2 The groove member 24 that constitutes the groove portion is formed, and the slide member 26 that is movable in the lateral direction is slidable so as to approach or separate from the side peripheral portion of the mold provided with the groove portion 24. An inclined angular pin insertion hole 31 is provided in the slide member 26, and an inclined angular pin 32 that can be inserted into the angular pin insertion hole 31 is provided on the other of the upper mold 1 and the lower mold 2. angular pin 32 is set so that the slide member 26 is inserted into the angular pin insertion hole 31 is moved toward the mold who provided the slide member 26 with the progress of clamping, the angular pin insertion hole An inclined angular pin 32 that can be inserted into the protrusion 31 protrudes, and as the mold clamping progresses, the angular pin 32 is inserted into the angular pin insertion hole 31 and slides. Material 26 is set to move in a direction approaching to the side peripheral portions, Rutotomoni provided movably one slide body 7 which retractably into the mold to the slide member 26 in the lateral direction, the slide 7 the A spring 22 for elastically energizing the sliding body 7 in a direction protruding from the sliding member 26 is inserted into the lateral hole 27 in the side peripheral portion, and the sliding body pressing means serves as the spring 22, the angular pin 32, and the angular pin. constituted by a pin insertion hole 31, the tip of the first mold in clamping stage insertion amount of the angular pin insertion holes 31 of the angular pin 32, sliding body 7 which is elastically urged in the lateral direction is a protruding direction by a spring 22 The portion is set so as to enter the recessed groove portion 24 and pressed against the inner surface of the recessed groove portion 24, and the tip of the sliding body 7 is moved from the first mold clamping stage to the second mold clamping stage. Therefore continue And characterized in that the slide member 26 while maintaining the state in which the leading end portion of the body 7 is pressed against the resiliently to the inner surface of the recessed groove portion 24 is formed by set to move so as to approach more to the side peripheral portion To do. With such a configuration, when the synthetic resin 5 injected from the injection molding machine 4 is filled with a predetermined amount, the sliding body is filled until the compression molding of the synthetic resin 5 in the second mold clamping stage is finished after filling. No gap is formed between the tip surface of 7 and the upper mold 1 to the lower mold 2 on the opposite side from the side projecting the sliding body 7, so that no synthetic resin enters between them and no burr is generated. In addition, as the mold clamping progresses, the pressing force of the tip of the sliding body 7 against the inner surface of the mold 3 by the spring 22 is gradually increased. The synthetic resin can be further prevented from entering between the front end portion of the sliding body 7 and the inner surface of the mold 3.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0009]
The mold 3 is composed of an upper mold 1 and a lower mold 2, and either the upper mold 1 or the lower mold 2 is a fixed mold, and the other is a movable mold. Yes. The embodiment shown in the accompanying drawings shows an example in which the upper mold 1 is a fixed mold and the lower mold 2 is a movable mold. The fixed mold (that is, the upper mold 1 in the figure) is attached to the fixed-side press machine 9 via a fixed-side mounting plate 9a, and this fixed mold is provided with a hot runner 10 and melted from the injection molding machine 4. The prepared synthetic resin is supplied into the mold 3 from the gate 11 portion at the tip of the hot runner 10. The movable mold (that is, the lower mold 2 in the figure) is attached to the movable press 12 via a movable attachment plate 12a.
[0010]
A mold 3 composed of an upper mold 1 and a lower mold 2 is clamped, a first mold clamping stage in which a predetermined amount of synthetic resin 5 injected from an injection molding machine 4 is filled, It consists of two stages including a second mold clamping stage for compressing and molding a predetermined amount of the synthetic resin 5 filled in the mold 3.
[0011]
A sliding body 7 protrudes into the cavity 6 from at least one of the upper mold 1 and the lower mold 2. In the accompanying drawings, a first sliding body 7a is provided on the lower mold 2 side which is a movable mold, and a second sliding body 7b is provided on the upper mold 2 side which is a stationary mold.
[0012]
First, the first sliding body 7a will be described. As shown in the accompanying drawings, the lower mold 2 is provided with a protrusion 29 protruding upward, and the stepped collar 15 is provided in the hole 14 provided in the protrusion 29 portion of the lower mold 2. The upper end surface of the collar 15 is flush with the upper surface of the lower mold 2. A first sliding body 7 a is mounted in the collar 15 so as to be movable up and down, and an upper portion of the first sliding body 7 a protrudes upward from a hole 16 provided in the collar 15. A cap 17 is detachably attached to the lower end opening of the collar 15 with a bolt, and a pin guide 19 is provided on the cap 17 so as to project into a guide hole 20 that opens below the first sliding body 7a. A pin guide 19 is slidably fitted. Further, an upper portion of a spring 22 made of a coil spring is fitted into a large-diameter spring fitting hole portion 21 which is continuous with the guide hole 20 of the cap 17 and below the guide hole 20, and the upper end of the spring 22 is a spring fitting hole portion. 21, the lower end of the spring 22 is in contact with the upper surface of the cap 17, and the first sliding body 7 a that is movable up and down is elastically biased upward. The first sliding body 7a is placed on the lower surface of the upper mold 1 that is continuously opposed from the time of filling the synthetic resin in the first mold clamping stage to the time of compression molding of the synthetic resin 5 in the second mold clamping stage. The spring 22 is elastically pressed. Therefore, in this embodiment, the sliding body pressing means 8 is constituted by the spring 22.
[0013]
Next, the second sliding body 7b will be described. The upper mold 1, which is a fixed mold, is provided with a hanging wall 23 on the side peripheral portion downward, and a concave groove portion 24 is provided on the inner peripheral portion of the hanging wall 23 upward from the lower surface portion of the upper mold 1. Is formed. A slide block 25 is slidably provided on the outside of the hanging wall 23 so as to be movable toward and away from the hanging wall 23. The slide block 25 is constructed by providing the slide member 26 with the same collar 15 as described above. The collar 15 is provided with the second sliding body 7b so as to be slidable in the lateral direction, and the cap 17, the pin guide 19 and the spring 22 are provided in the same manner as described above, and the second sliding body 7b is colored by the spring 22. 15, the second sliding body 7 b is inserted into the lateral hole 27 of the hanging wall 23, and the mold 3 including the upper mold 1 and the lower mold 2 is opened. The tip of the moving body 7 b is located in the horizontal hole 27. Here, since the relationship among the collar 15, the cap 17, the pin guide 19, the spring 22, and the second sliding body 7b (corresponding to the first sliding body 7a) is the same as described above, a duplicate description is omitted. The slide member 26 is provided with an angular pin insertion hole 31 that is opened obliquely downward so as to become inward as it goes downward. On the other hand, an angular pin 32 protrudes obliquely outward and upward at a step portion 30 on the side of the protrusion 29 of the lower mold 2, and the lower mold 2 that is a movable mold is moved upward to form a mold. When tightened, the angular pin 32 is inserted into the angular pin insertion hole 31, whereby the slide member 26 moves to the hanging wall 23 side while being guided by the angular pin 32, and the second sliding body 7 b is moved to the concave groove portion 24. The tip of the second sliding body 7b is elastically pressed against the inner surface of the concave groove 24 at least during the filling of the synthetic resin in the first mold clamping stage. Even after the filling of the synthetic resin is completed, the lower mold 2 is further moved to continue the compression molding of the synthetic resin 5 in the second mold clamping stage. Elastically pressed against the inner surface of It has become the jar. Therefore, in the present embodiment, the sliding body pressing means 8 is constituted by the spring 22, the angular pin 32 and the angular pin insertion hole 31.
[0014]
Therefore, the synthetic resin molded product 35 is molded as follows using the mold 3 having the above-described configuration.
[0015]
FIG. 1 shows a state before mold clamping. From the stage before the mold clamping, as shown in FIG. 2, the lower mold 2 that is a movable mold is moved upward to perform half mold clamping. This half mold clamping is the first mold clamping stage, and the protrusion 29 of the lower mold 2 is slightly fitted to the inner surface of the lowermost end portion of the hanging wall 23 of the upper mold 1. In this first mold clamping stage, the tip portions of the first sliding body 7a and the second sliding body 7b are both placed on the upper mold 1 or the lower mold 2 opposed by the sliding body pressing means 8 (that is, the mold). It is pressed against the inner surface of the mold 3). In the state of the first mold clamping stage, as shown in FIG. 3, a predetermined amount of the molten synthetic resin 5 injected from the injection molding machine 4 enters the mold 3 (that is, inside the cavity 6) via the hot runner 10. Supplied and filled. Next, as shown in FIG. 4, the lower mold 2, which is a movable mold, is moved upward to compress the filled synthetic resin 5. In this case, compression molding is performed by clamping the mold under the condition of clamping pressure> injection pressure. The leading end portions of the first sliding body 7a and the second sliding body 7b are both in the second mold clamping stage from the time of filling the synthetic resin in the first mold clamping stage by the action of the sliding body pressing means 8. Is pressed against the inner surface of the opposing mold 3 until the compression molding of the synthetic resin 5 in the above, so that the synthetic resin is placed between the tips of the first sliding body 7a and the second sliding body 7b and the inner surface of the mold 3. Is something that will not enter.
[0016]
Here, when the lower mold 2, which is a movable mold, moves closer to the upper mold 1 in the process from the first mold clamping stage to the second mold clamping stage, the tip of the first sliding body 7 a The first sliding body 7a moves back into the collar 15 against the spring force of the spring 22 while maintaining the state where the portion is elastically pressed against the inner surface of the mold 3 by the spring 22. As the mold 2 rises and the mold clamping proceeds, the pressing force of the spring 22 against the inner surface of the mold 3 at the tip of the first sliding body 7a increases. Further, when the lower mold 2 which is a movable mold moves so as to approach the upper mold 1 in the process from the first mold clamping stage to the second mold clamping stage, the tip end portion of the second sliding body 7b Is held elastically pressed against the inner surface of the mold 3 by the spring 22, and the slide member 26 approaches the hanging wall 23 side. The pressing force of the tip of the second sliding body 7b against the inner surface of the mold 3 is increased. Therefore, as the mold clamping progresses, the contact force of the sliding body 7 to the inner surface of the mold 3 increases, and the synthetic resin does not enter between the tip of the sliding body 7 and the inner surface of the mold 3.
[0017]
When the compression molding is completed as described above, the lower mold 2 is moved downward in the order of FIG. 5 → FIG. 6 → FIG. 7 to open the mold, and the synthetic resin molding molded as shown in FIG. The product 35 is taken out. The synthetic resin molded product 35 thus obtained is provided with a hole 36 formed by the sliding body 7, and the hole 36 is filled with the synthetic resin in the first mold clamping stage as described above. Since the tip of the sliding body 7 is continuously pressed against the inner surface of the mold 1 by the sliding body pressing means 8 when the first clamping stage reaches the second clamping stage, sliding A synthetic resin does not enter between the distal end portion of the moving body 7 and the inner surface of the mold 3, and therefore, a product in which no burr or the like is generated in the hole 36 formed in the synthetic resin molded product 35 can be obtained.
[0018]
【The invention's effect】
In the present invention, as described above, in the mold composed of the upper mold and the lower mold, one of the molds moves up and down, and the mold clamping is injected from the injection molding machine. It consists of two stages: a first mold clamping stage in which a predetermined amount of synthetic resin is filled inside and a second mold clamping stage for compressing and molding a predetermined amount of synthetic resin filled in the mold. The sliding body protrudes into the cavity from at least one of the upper mold and the lower mold, and the tip of the sliding body is filled with the synthetic resin in the first mold clamping stage to the synthetic resin in the second mold clamping stage. Since there is provided a sliding body pressing means for pressing against the opposite mold inner surface until compression molding, when filling a predetermined amount of synthetic resin injected from the injection molding machine, Until the compression molding of the synthetic resin is completed There is no gap between the tip of the moving body and the upper or lower mold opposite to the side projecting the sliding body, and there is a hole where no synthetic resin enters and no burr occurs. A molded product can be obtained by a mold having a simple configuration. In addition, a concave groove part forming a part of the cavity is formed in the inner peripheral part of one side peripheral part of the upper mold or the lower mold, and the above-mentioned side peripheral part of the mold provided with the concave groove part. A slide member that can move laterally so as to approach or leave is slidably provided, an inclined angular pin insertion hole is provided in the slide member, and the angular pin is inserted into the other of the upper mold or the lower mold. An inclined angular pin that can be inserted into the hole is projected, and as the mold clamping progresses, the angular pin is inserted into the angular pin insertion hole, and the slide member is set to move in a direction approaching the side periphery , and slide Rutotomoni provided freely slide haunt member on one of the mold movably in the transverse direction, the sliding body is inserted into the transverse hole of the side peripheral portion, with elastic in the direction of projecting the slide from the slide member The ba And the spring of the sliding member pressing means is provided, constituted by the angular pins and angular pin insertion hole, the insertion amount of the angular pin insertion hole of the angular pin in a first clamping step is the protruding direction by a spring The front end portion of the sliding body elastically biased in the lateral direction is set so as to enter the concave groove portion and be pressed against the inner surface of the concave groove portion, and the front end portion of the sliding body is changed from the first mold clamping stage. moving the slide member while keeping the state where the top portion is devoted resiliently press the inner surface of the recessed groove portion of the sliding body to continue in accordance with reaching the second clamping step to approach more to the side peripheral portion Therefore, the tip of the sliding body elastically biased in the lateral direction by the spring is a part of the cavity provided in the inner peripheral portion of the side peripheral portion of one mold provided with the slide member. Of the concave grooves that make up In a state of being pressed against the surface, with the progress of clamping, the pressing force to the inner face of the recessed groove portion by the spring of the front end portion of the sliding body is became gradually increased, and the distal end portion of the sliding body Synthetic resin can be further prevented from entering between the inner surface of the concave groove portion, and as a result, a molded product having a hole free from burrs can be obtained with a simple mold.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a state before mold clamping according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the same half-clamping state.
FIG. 3 is a cross-sectional view showing a state of the injection molding same as above.
FIG. 4 is a cross-sectional view showing a state of compression molding same as above.
FIG. 5 is a cross-sectional view showing an initial state of mold opening according to the above.
FIG. 6 is a cross-sectional view showing a state where the mold opening is further advanced.
FIG. 7 is a cross-sectional view showing a state where the mold opening is completed and the synthetic resin molded product is taken out.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Mold 4 Injection molding machine 5 Synthetic resin 6 Cavity 7 Slide body 8 Slide body pressing means 22 Spring 26 Slide member 31 Angular pin insertion hole 32 Angular pin

Claims (1)

上金型と下金型とからなる金型においていずれか一方の金型が上下方向に移動し、その型締めが、射出成形機から射出された合成樹脂が内部に所定量充填される第１の型締め段階と、金型内に充填された所定量の合成樹脂を圧縮して成形するための第２の型締め段階との２段階よりなり、上金型乃至下金型の少なくとも一方からキャビティ内に摺動体を突出し、この摺動体の先端部を第１の型締め段階における合成樹脂の充填時から第２の型締め段階における合成樹脂の圧縮成形時まで継続して対向する金型内面に押し当てるための摺動体押し当て手段を設けて成る金型であって、上金型乃至下金型の一方の側周部の内周部にキャビティの一部を構成する凹溝部を形成し、凹溝部を設けた方の金型の上記側周部に対して近づいたり、離れたりするように横方向に移動自在なスライド部材をスライド自在に設け、該スライド部材に傾斜したアンギュラピン挿入孔を設けると共に、上金型乃至下金型の他方に上記アンギュラピン挿入孔に挿入自在な傾斜したアンギュラピンを突設して型締めの進行と共にアンギュラピンがアンギュラピン挿入孔内に差し込まれてスライド部材が上記側周部に近づく方向に移動するように設定し、スライド部材に一方の金型内に出没自在な摺動体を横方向に移動自在に設けると共に、摺動体を上記側周部の横孔に挿入し、摺動体をスライド部材から突出する方向に弾性付勢するためのバネを設けて摺動体押し当て手段を上記バネと、アンギュラピン及びアンギュラピン挿入孔により構成し、第１の型締め段階においてアンギュラピンのアンギュラピン挿入孔への差し込み量を、バネにより突出方向である横方向に弾性付勢された摺動体の先端部が凹溝部内に突入して凹溝部の内側面に押し当てられるように設定すると共に、摺動体の先端部を第１の型締め段階から第２の型締め段階に到るにしたがって継続して摺動体の先端部が凹溝部の内側面に弾性的に押し当てられた状態を保持しながらスライド部材が上記側周部により近づくように移動するように設定して成ることを特徴とする圧縮成形用金型。In the mold composed of the upper mold and the lower mold, one of the molds moves in the vertical direction, and the mold clamping is the first in which a predetermined amount of the synthetic resin injected from the injection molding machine is filled. And a second mold clamping stage for compressing and molding a predetermined amount of synthetic resin filled in the mold, and from at least one of the upper mold and the lower mold The inner surface of the mold in which the sliding body protrudes into the cavity and the tip of the sliding body continuously faces from the time of filling the synthetic resin in the first mold clamping stage to the time of the synthetic resin compression molding in the second mold clamping stage. A mold provided with a sliding body pressing means for pressing against the inner mold, wherein a concave groove part forming a part of the cavity is formed on the inner peripheral part of one side peripheral part of the upper mold or the lower mold. Approximate to or away from the side periphery of the mold with the groove So that the provided laterally movable slide member slidably, provided with an angular pin insertion hole which is inclined to said sliding member, freely inserted into the angular pin insertion hole into the other of the upper die to the lower die An inclined angular pin is provided so that as the mold clamping progresses, the angular pin is inserted into the angular pin insertion hole so that the slide member moves in a direction approaching the side peripheral portion. springs for movably provided Rutotomoni a freely slide retractable into the mold laterally, the sliding body is inserted into the transverse hole of the side peripheral portion, elastically biased in a direction to protrude the slider from the slide member And the sliding body pressing means is constituted by the spring, the angular pin and the angular pin insertion hole, and the angular pin is inserted into the angular pin in the first mold clamping stage. The insertion amount to, the tip portion of the sliding body which is elastically biased in the transverse direction is projecting direction is set to be pressed against the inner surface of the recessed groove portion and projects into the groove portion by a spring, the sliding member The tip of the slide slides continuously from the first mold clamping stage to the second mold clamping stage while maintaining the state in which the tip of the sliding body is elastically pressed against the inner surface of the concave groove compression molding die member is characterized by being set to move so as to approach more to the side periphery.
JP19321598A 1998-07-08 1998-07-08 Mold for compression molding Expired - Fee Related JP3920991B2 (en)

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