JP4163318B2

JP4163318B2 - Molding equipment

Info

Publication number: JP4163318B2
Application number: JP01113199A
Authority: JP
Inventors: 民雄古屋; 陽二牛木; 光彌村田
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1999-01-19
Filing date: 1999-01-19
Publication date: 2008-10-08
Anticipated expiration: 2019-01-19
Also published as: JP2000202873A

Description

【０００１】
【発明の属する技術分野】
本発明は成形装置、特に、固定型と、その固定型に対向する第１可動型と、その第１可動型に対向する第２可動型と、固定型および第１可動型の両合せ面間に設けられた少なくとも１つの製品成形用第１キャビティと、第１可動型および第２可動型の両合せ面間に設けられた少なくとも１つの製品成形用第２キャビティとを備えた成形装置に関する。
【０００２】
【従来の技術】
従来、この種の成形装置において、その離型時には、固定型および第１可動型間ならびに第１および第２可動型間を同時に開く、といった手段が採用されている。
【０００３】
【発明が解決しようとする課題】
しかしながら前記のような手段を採用すると、型開き状態における固定型および第２可動型間の間隔が大となって、工場内スペースに対する成形装置の占有率が高くなる、といった不具合を生じる。
【０００４】
【課題を解決するための手段】
本発明は、型開き状態における固定型および第２可動型間の間隔を従来のものよりも小にすることができる前記成形装置を提供することを目的する。
【０００５】
前記目的を達成するため本発明によれば、固定型と、その固定型に対向する第１可動型と、その第１可動型に対向する第２可動型と、固定型および第１可動型の両合せ面間に設けられた少なくとも１つの製品成形用第１キャビティと、第１可動型および第２可動型の両合せ面間に設けられた少なくとも１つの製品成形用第２キャビティとを備えた成形装置であって、成形作業後、第１可動型および第２可動型を、それら両型間を閉じた状態で移動させることにより固定型および第１可動型間を開いて第１キャビティより製品の取出しを行い、次いで、第１可動型を移動させて固定型および第１可動型間を閉じると共に第１可動型および第２可動型間を開いて第２キャビティより製品の取出しを行うようにしたものにおいて、固定型には、溶融状態の成形材料を射出し得る射出シリンダが固定されると共に、その射出シリンダのノズルと第１キャビティとの間を連通させるスプルが固定型内に形成され、第１可動型内には、固定型並びに第１及び第２可動型相互が閉じられた状態でスプルの出口及び第２キャビティ間を連通させる連通路と、固定型及び第１可動型相互が閉じられた状態でスプルの出口と連通する、連通路の入口を開閉し得る弁装置と、その連通路の入口及び出口間で該連通路内の成形材料を溶融状態に保つべく加熱するヒータとが設けられ、第１可動型および第２可動型の両合せ面間には、その両可動型相互が閉じられた状態で第２キャビティと連通路の出口との間を連通させる供給路が形成され、その供給路及び連通路の出口が非加熱領域とされていて、それら供給路及び出口に対応したスクラップ部が、第１及び第２可動型間を開いたときに製品と一体に取出し可能であることを特徴とする。
【０００６】
前記のような順序で型開きを行って２つの製品の取出し作業を行うと、従来のごとく、固定型および第１可動型間ならびに第１および第２可動型間を同時に開く場合に比べて、型開き状態における固定型および第２可動型間の間隔を小にし、これにより工場内スペースの有効利用を図ることができる。これは、例えば製品が深い椀型をなす、つまり製品における型開閉方向長さが長い場合に顕著となる。
【０００７】
また特に射出シリンダを固定型側に配設して固定することが可能となるので、第１可動型を軽量化して摺動部の摩耗を低減し、またその型構造も簡素化することができる。
【０００８】
また連通路の出口および供給路は非加熱領域であるから、それらに在る溶融成形材料は硬化して形成されるスクラップ部は、第１及び第２可動型を開いたときに製品と共に取出されて連通路の出口および供給路から離脱する。このとき、連通路の加熱領域にある溶融成形材料が連通路出口に僅かに突出すると、その突出部分は、該出口が非加熱領域であることから、直ちに高粘度となって栓の役目をなし、これにより連通路出口からの溶融成形材料の漏出が防止され、一方、連通路入口は弁装置により閉じられているので溶融成形材料の漏出は生じない。また次回の射出成形開始時には、連通路入口を弁装置により閉じておき、この閉状態を、スプルからの溶融成形材料がスプル出口を満たして入口のレベルを越えるまで保持しておけば、空気がスプルから溶融成形材料と共に連通路内に入り込んで不良品を発生する、といった不具合を回避することができる。
【０００９】
【発明の実施の形態】
図１，２に示す深い椀形をなす製品１は合成樹脂、例えばＰＰ、ＰＥ、ＡＢＳ等よりなる成形材料を用いて射出成形により得られたものである。
【００１０】
図３，４に示すように、成形装置としての射出成形装置２は鉛直な合せ面３を有する固定型４と、その固定型４の鉛直な合せ面３に一方の鉛直な合せ面５を対向させ、且つ水平方向に往復動可能な第１可動型６と、その第１可動型６の他方の鉛直な合せ面７に鉛直な合せ面８を対向させ、且つ水平方向に往復動可能な第２可動型９とを備える。
【００１１】
固定型４は固定基板１０に取付けられ、第２可動型９は固定基板１０に対向する可動基板１１に取付けられる。可動基板１１は上、下２本宛、したがって４本の水平なガイドロッド１２に摺動可能に支持され、それらガイドロッド１２は、一方の固定基板１０および図示しない他方の固定基板間に架設される。可動基板１１に複動形主作動シリンダ１３のピストンロッド１４が連結され、その主作動シリンダ１３は図示しない他方の固定基板に水平に支持される。
【００１２】
第１可動型６は、その下端に摺動板１５を一体に有し、その摺動板１５の両側部に存する下向き樋状部１６が、下側の２本のガイドロッド１２上にそれぞれ摺動可能に載せられている。また第２可動型９の合せ面８に突設された上、下２本宛、したがって４本のガイドピン１７が第１可動型６の４つのガイド孔１８に摺動可能に挿入される。さらに第２可動型９の両側において、可動基板１１にそれぞれ単動形副作動シリンダ１９が各ガイドピン１７と平行に取付けられ、各副作動シリンダ１９のピストンロッド２０が第１可動型６の各側面に存する突出板２１に連結される。
【００１３】
図３において、第２可動型９は固定型４に対して後退限である型開き位置に在る。型締め時には、図５に示すように、両副作動シリンダ１９の作動により第１可動型６を前進させて固定型４に合致させ、次いで各副作動シリンダ１９の作動回路を開状態にし、その後主作動シリンダ１３の作動により第２可動型９を前進させて第１可動型６に合致させ、この主作動シリンダ１３の加圧力により三型４，６，９を型締め状態に保持する。
【００１４】
この型締め状態において、図６に示すように固定型４および第１可動型６の両合せ面３，５間に、少なくとも１つ、図示例では１つの製品成形用第１キャビティ２２と、その第１キャビティ２２に連通する成形材料用第１供給路２３とが形成される。また第１可動型６および第２可動型９の両合せ面７，８間に少なくとも１つ、図示例では１つの製品成形用第２キャビティ２４と、その第２キャビティ２４に連通する成形材料用第２供給路２５とが形成される。
【００１５】
さらに固定型４にスプル２６が形成され、そのスプル２６の入口２７は、固定基板１０の孔部２８に面するように固定型４の取付面２９に開口しており、出口３０は第１供給路２３に連通する。射出シリンダ３１は固定型４側に配設されて固定され、そのノズル３２は孔部２８に収容されてスプル２６の入口２７に連通する。スプル２６において、その入、出口２７，３０間は、成形材料を溶融状態に保つべく、固定型４に設けられた加熱手段としての、ヒータ３３により加熱されるようになっている。また出口３０は、固定型４内部から第１供給路２３に向って内径が増加するテーパ孔に形成される。
【００１６】
第１および第２供給路２３，２５間は、第１可動型６に設けられた連通路３４により連通される。その連通路３４において、第１供給路２３に連通する入口３５および第２供給路２５に連通する出口３６間は成形材料を溶融状態に保つべく、第１可動型６に設けられた加熱手段としてのヒータ３７により加熱されるようになっている。入口３５は小径の等径孔に形成され、一方、出口３６は入口３５よりも高位置に配設されると共に第１可動型６内部から第２供給路２５に向って内径が増加するテーパ孔に形成される。
【００１７】
第１可動型６に、入口３５を開閉する弁装置３８が設けられる。その弁装置３８は、入口３５に挿脱されるピン状弁体３９と、そのピン状弁体３９を往復動させる作動源としての複動形小型作動シリンダ４０とよりなる。第１可動型６に、入口３５と同軸上に在る支持孔４１が形成され、その支持孔４１にピン状弁体３９が摺動可能に嵌合される。小型作動シリンダ４０は、第１可動型６の第２可動型９側に存する合せ面７に突設されており、これに対応すべく、第２可動型９の合せ面８に小型作動シリンダ４０を収容し得る凹所４２が設けられている。これにより弁装置３８が、第１，第２可動型６，９を閉じた状態において両型６，９内に収納される。
【００１８】
図７にも示すように、連通路３４において、その入口３５近傍に比較的広い円筒状空間４３が在り、その空間４３内に円形の弁体支持板４４が嵌着される。その弁体支持板４４はピン状弁体３９の先端部側を摺動可能に貫通させる支持孔４５と、その支持孔４５の外周に設けられた少なくとも１つ、図示例では４つの成形材料用流通孔４６とを有する。この弁体支持板４４により、スプル２６からの溶融成形材料の流れによるピン状弁体３９の曲がりを防止することができる。
【００１９】
前記のように第１可動型６に、第１および第２供給路２３，２５間を連通する連通路３４を設けると、射出シリンダ３１を固定型４側に配設して固定することが可能となる。これにより、第１可動型６を軽量化してその摺動板１５の摩耗を低減し、またその型６の構造も簡素化することができる。
【００２０】
製品１の射出成形に当っては、図５，６の型締め状態において射出シリンダ３１のノズル３２から、ＰＰよりなる溶融成形材料をスプル２６に射出して、第１供給路２３を介し第１キャビティ２２に、また第１供給路２３、連通路３４および第２供給路２５を介し第２キャビティ２４にそれぞれ充填して２つの製品１を成形する。
【００２１】
離型に当っては、図８，９に示すように小型作動シリンダ４０を作動させてピン状弁体３９により連通路３４の入口３５を閉じ、また各副作動シリンダ１９の作動回路を閉状態にすると共に主作動シリンダ１３を作動させて、第１可動型６および第２可動型９を、それら両型６，９間を閉じた状態で後退させることにより固定型４および第１可動型６間を開いて、第１キャビティ２２により成形された製品１の取出し作業を行う。
【００２２】
スプル２６の出口３０および第１供給路２３は非加熱領域であるから、それらに在る溶融成形材料は硬化してスクラップ部４７となり、そのスクラップ部４７は製品１と共に出口３０および第１供給路２３から離脱する。またスプル２６の加熱領域に在る溶融成形材料ｍが出口３０に僅かに突出すると、そこはテーパ孔となっていてその内周面、つまり溶融成形材料ｍと接触する冷却面の面積が拡張され、しかも非加熱領域であることから、突出部分は直ちに高粘度となって栓の役目をなし、これによりスプル２６の出口３０からの溶融成形材料ｍの漏出が防止される。また連通路３４においては、その入口３５がピン状弁体３９により閉じられているので、入口３５からの溶融成形材料ｍの漏出も防止される。次いで、図１０，１１に示すように両副作動シリンダ１９をそれぞれ作動させ、第１可動型６を前進させて固定型４および第１可動型６間を閉じると共に第１可動型６および第２可動型９間を開いて第２キャビティ２４により成形された製品１の取出し作業を行う。連通路３４の出口３６および第２供給路２５は非加熱領域であるから、それらに在る溶融成形材料は硬化してスクラップ部４７となり、そのスクラップ部４７は製品１と共に出口３６および第２供給路２５から離脱する。また連通路３４の加熱領域にある溶融成形材料ｍが出口３６に僅かに突出すると、前記同様に、そこはテーパ孔となっていてその内周面、つまり溶融成形材料ｍと接触する冷却面の面積が拡張され、しかも非加熱領域であることから、突出部分は直ちに高粘度となって栓の役目をなし、これにより連通路３４の出口３６からの溶融成形材料ｍの漏出が防止される。なお、連通路３４の入口３５はピン状弁体３９により閉じられているので溶融成形材料ｍの漏出は生じない。
【００２３】
前記のような順序で型開きを行って２つの製品１の取出し作業を行うと、固定型４および第１可動型６間ならびに第１および第２可動型６，９間を同時に開く場合に比べて、型開き状態における固定型４および第２可動型９間の間隔を小にし、これにより工場内スペースの有効利用を図ることができる。これは、実施例の如く、製品１が深い椀型をなす、つまり製品１における型開閉方向長さが長い場合に顕著となる。
【００２４】
２回目以後の射出成形開始時には、図１１に示したように連通路２４の入口３５をピン状弁体３９により閉じておき、この閉状態を、図１２に示すように、溶融成形材料ｍがスプル２６の出口３０および第１供給路２３の下部を満たしてその表面が入口３５を越えるまで保持する。このような方法を採用すると、図１１において、スプル２６の出口３０および第１供給路２３内の空気がスプル２６からの溶融成形材料ｍと共に連通路３４内に入り込んで不良品を発生する、といった不具合を回避することができる。
【００２５】
【発明の効果】
本発明によれば、従来のごとく、固定型および第１可動型間ならびに第１および第２可動型間を同時に開く場合に比べて、型開き状態におる固定型および第２可動型間の間隔を小にし、これにより工場内スペースの有効利用を図ることが可能となる。
【００２６】
また特に射出シリンダを固定型側に配設して固定することが可能となるので、第１可動型を軽量化して摺動部の摩耗を低減し、またその型構造も簡素化できる。
【００２７】
また第１可動型内には、スプルの出口及び第２キャビティ間を連通させる連通路と、連通路の入口を開閉し得る弁装置と、その連通路の入口及び出口間で該連通路内の成形材料を溶融状態に保つべく加熱するヒータとが設けられ、第１可動型および第２可動型の両合せ面間に形成されて第２キャビティと連通路出口との間を連通させる供給路と、連通路の出口とが非加熱領域とされていて、それら供給路及び出口に対応したスクラップ部が、第１及び第２可動型間を開いたときに製品と一体に取出し可能であるので、その製品の取出しの際に、連通路の加熱領域にある溶融成形材料が連通路出口に僅かに突出すると、その突出部分は、該出口が非加熱領域であることから、直ちに高粘度となって栓の役目をなし、これにより連通路出口からの溶融成形材料の漏出が防止され、一方、連通路入口は弁装置により閉じられているので溶融成形材料の漏出は生じない。また次回の射出成形開始時には、連通路入口を弁装置により閉じておき、この閉状態を、スプルからの溶融成形材料がスプル出口を満たして入口のレベルを越えるまで保持しておけば、空気がスプルから溶融成形材料と共に連通路内に入り込んで不良品を発生する、といった不具合を回避することができる。
【図面の簡単な説明】
【図１】製品の斜視図
【図２】図１の２−２線断面図
【図３】一部を破断した射出成形装置の側面図
【図４】図３の４−４線断面図
【図５】射出成形装置の型締め状態を示す側面図
【図６】図５に対応する要部拡大断面図
【図７】図６の７−７線断面図
【図８】射出成形装置において、固定型および第１可動型間を開いた状態を示す側面図
【図９】図８に対応する要部拡大断面図
【図１０】射出成形装置において、固定型および第１可動型間を閉じ、一方、第１および第２可動型間を開いた状態を示す側面図
【図１１】図１０に対応する要部拡大断面図
【図１２】２回目以後の射出成形開始時における射出成形装置の要部拡大断面図
【符号の説明】
１製品
２射出成形装置（成形装置）
４固定型
６第１可動型
９第２可動型
２２第１キャビティ
２４第２キャビティ
２５第２供給路（供給路）
２６スプル
３０スプルの出口
３１射出シリンダ
３２ノズル
３３ヒータ
３４連通路
３５連通路の入口
３６連通路の出口
４７スクラップ部 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding apparatus, and in particular, between a fixed mold, a first movable mold facing the fixed mold, a second movable mold facing the first movable mold, and both mating surfaces of the fixed mold and the first movable mold. The present invention relates to a molding apparatus provided with at least one first product molding cavity provided in the above and at least one second product molding cavity provided between the mating surfaces of the first movable mold and the second movable mold.
[0002]
[Prior art]
Conventionally, in this type of molding apparatus, at the time of releasing, a means has been adopted in which the fixed mold and the first movable mold and the first and second movable molds are simultaneously opened.
[0003]
[Problems to be solved by the invention]
However, when the above-described means is adopted, there arises a problem that the interval between the fixed mold and the second movable mold in the mold open state becomes large, and the occupying ratio of the molding apparatus with respect to the factory space increases.
[0004]
[Means for Solving the Problems]
An object of the present invention is to provide the molding apparatus in which the distance between the fixed mold and the second movable mold in the mold open state can be made smaller than the conventional one.
[0005]
In order to achieve the above object, according to the present invention, a fixed mold, a first movable mold facing the fixed mold, a second movable mold facing the first movable mold, a fixed mold and a first movable mold At least one product molding first cavity provided between the mating surfaces, and at least one product molding second cavity provided between the mating surfaces of the first movable mold and the second movable mold. A molding device that, after a molding operation, moves the first movable mold and the second movable mold in a state in which the two molds are closed to open the fixed mold and the first movable mold so that a product is obtained from the first cavity. Next, the first movable mold is moved to close the fixed mold and the first movable mold, and the first movable mold and the second movable mold are opened to remove the product from the second cavity. The fixed mold is melted With injection cylinder capable of injecting a molding material state is fixed, sprue communicating between the nozzle and the first cavity of the injection cylinder is formed in the stationary die, in the first movable die, the stationary die In addition, a communication path that communicates between the sprue outlet and the second cavity in a state where the first and second movable molds are closed, and a communication path that communicates between the fixed mold and the first movable mold in a closed state. A valve device capable of opening and closing the inlet of the communication path, and a heater for heating the molding material in the communication path between the inlet and the outlet of the communication path to maintain a molten state. A supply path is formed between the movable type mating surfaces so that the second cavity communicates with the outlet of the communication path in a state in which both movable types are closed. The supply path and the outlet of the communication path are connected to each other. These are non-heated areas Scrap section corresponding to the road and outlet, characterized in that it is a removable product integrally when opening between the first and second movable die.
[0006]
When the mold is opened in the order as described above and the two products are taken out, as compared with the conventional case where the fixed mold and the first movable mold and the first and second movable molds are opened simultaneously, The space between the fixed mold and the second movable mold in the mold open state can be made small, thereby making it possible to effectively use the factory space. This becomes conspicuous when, for example, the product has a deep bowl shape, that is, when the length of the product in the mold opening / closing direction is long.
[0007]
In particular, since the injection cylinder can be disposed and fixed on the fixed mold side, the weight of the first movable mold can be reduced, the wear of the sliding portion can be reduced, and the mold structure can also be simplified. .
[0008]
Further, since the outlet and supply path of the communication path are non-heated regions, the scrap part formed by curing the melt molding material existing in them is taken out together with the product when the first and second movable molds are opened. To leave the outlet of the communication path and the supply path. At this time, if the melt molding material in the heating area of the communication path slightly protrudes to the communication path outlet, the protruding portion immediately becomes high viscosity and serves as a plug because the outlet is a non-heating area. Thus, leakage of the molten molding material from the communication passage outlet is prevented, while leakage of the molten molding material does not occur because the communication passage inlet is closed by the valve device. At the start of the next injection molding, the communication passage inlet is closed by a valve device, and this closed state is maintained until the molten molding material from the sprue fills the sprue outlet and exceeds the level of the inlet. It is possible to avoid a problem that a defective product is generated by entering into the communication path together with the melt molding material from the sprue.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A product 1 having a deep bowl shape shown in FIGS. 1 and 2 is obtained by injection molding using a molding material made of a synthetic resin such as PP, PE, ABS or the like.
[0010]
As shown in FIGS. 3 and 4, an injection molding apparatus 2 as a molding apparatus has a fixed mold 4 having a vertical mating surface 3 and one vertical mating surface 5 facing the vertical mating surface 3 of the fixed mold 4. And a first movable mold 6 capable of reciprocating in the horizontal direction and a vertical mating surface 8 opposed to the other vertical mating surface 7 of the first movable mold 6 and capable of reciprocating in the horizontal direction. Two movable molds 9 are provided.
[0011]
The fixed mold 4 is attached to the fixed substrate 10, and the second movable mold 9 is attached to the movable substrate 11 facing the fixed substrate 10. The movable substrate 11 is slidably supported by the two upper and lower guide rods 12 and therefore by four horizontal guide rods 12. The guide rods 12 are installed between one fixed substrate 10 and the other fixed substrate (not shown). The A piston rod 14 of a double-acting main working cylinder 13 is connected to the movable board 11, and the main working cylinder 13 is horizontally supported by the other fixed board (not shown).
[0012]
The first movable die 6 integrally has a sliding plate 15 at its lower end, and the downward hook-like portions 16 existing on both sides of the sliding plate 15 slide on the two lower guide rods 12 respectively. It is placed so that it can move. In addition, the two guide pins 17 are inserted into the four guide holes 18 of the first movable die 6 so as to be slidable. Further, on both sides of the second movable mold 9, single-acting subactuating cylinders 19 are respectively attached to the movable substrate 11 in parallel with the guide pins 17, and the piston rods 20 of the subactuating cylinders 19 are respectively connected to the first movable mold 6. Connected to the protruding plate 21 on the side.
[0013]
In FIG. 3, the second movable mold 9 is in a mold opening position which is a backward limit with respect to the fixed mold 4. At the time of mold clamping, as shown in FIG. 5, the first movable mold 6 is moved forward by the operation of both sub-actuating cylinders 19 to match the fixed mold 4, and then the operation circuit of each sub-actuating cylinder 19 is opened. The second movable mold 9 is moved forward by the operation of the main working cylinder 13 to be matched with the first movable mold 6, and the molds 4, 6, 9 are held in the mold-clamped state by the pressure applied by the main working cylinder 13.
[0014]
In this clamping state, as shown in FIG. 6, between the mating surfaces 3 and 5 of the fixed mold 4 and the first movable mold 6, at least one, in the illustrated example, one product-forming first cavity 22 and its A molding material first supply path 23 communicating with the first cavity 22 is formed. In addition, at least one between the mating surfaces 7 and 8 of the first movable mold 6 and the second movable mold 9, in the illustrated example, one product-forming second cavity 24, and a molding material communicating with the second cavity 24. A second supply path 25 is formed.
[0015]
Further, a sprue 26 is formed in the fixed mold 4, and an inlet 27 of the sprue 26 opens in the mounting surface 29 of the fixed mold 4 so as to face the hole 28 of the fixed substrate 10, and the outlet 30 is the first supply. It communicates with the road 23. The injection cylinder 31 is disposed and fixed on the fixed mold 4 side, and the nozzle 32 is accommodated in the hole 28 and communicates with the inlet 27 of the sprue 26. In the sprue 26, the space between the inlet and outlet 27, 30 is heated by a heater 33 as a heating means provided in the fixed mold 4 in order to keep the molding material in a molten state. The outlet 30 is formed in a tapered hole whose inner diameter increases from the inside of the fixed mold 4 toward the first supply path 23.
[0016]
The first and second supply paths 23 and 25 are communicated with each other by a communication path 34 provided in the first movable mold 6. In the communication path 34, a heating means provided in the first movable mold 6 is provided between the inlet 35 communicating with the first supply path 23 and the outlet 36 communicating with the second supply path 25 in order to keep the molding material in a molten state. The heater 37 is heated. The inlet 35 is formed as a small-diameter uniform hole, while the outlet 36 is disposed at a higher position than the inlet 35 and has a tapered hole whose inner diameter increases from the inside of the first movable mold 6 toward the second supply path 25. Formed.
[0017]
The first movable mold 6 is provided with a valve device 38 that opens and closes the inlet 35. The valve device 38 includes a pin-shaped valve body 39 inserted into and removed from the inlet 35 and a double-acting small operating cylinder 40 as an operation source for reciprocating the pin-shaped valve body 39. A support hole 41 that is coaxial with the inlet 35 is formed in the first movable mold 6, and a pin-like valve body 39 is slidably fitted into the support hole 41. The small working cylinder 40 protrudes from the mating surface 7 existing on the second movable die 9 side of the first movable die 6, and the small working cylinder 40 is provided on the mating surface 8 of the second movable die 9 to correspond to this. There is provided a recess 42 that can accommodate the. As a result, the valve device 38 is housed in both molds 6 and 9 in a state where the first and second movable molds 6 and 9 are closed.
[0018]
As shown in FIG. 7, the communication passage 34 has a relatively wide cylindrical space 43 in the vicinity of the inlet 35, and a circular valve body support plate 44 is fitted into the space 43. The valve body support plate 44 has a support hole 45 that slidably penetrates the distal end side of the pin-shaped valve body 39, and at least one provided on the outer periphery of the support hole 45. And a circulation hole 46. The valve body support plate 44 can prevent the pin-shaped valve body 39 from being bent due to the flow of the melt molding material from the sprue 26.
[0019]
As described above, when the first movable mold 6 is provided with the communication path 34 that communicates between the first and second supply paths 23 and 25, the injection cylinder 31 can be disposed and fixed on the fixed mold 4 side. It becomes. Thereby, the weight of the first movable mold 6 can be reduced, the wear of the sliding plate 15 can be reduced, and the structure of the mold 6 can be simplified.
[0020]
In the injection molding of the product 1, a melt molding material made of PP is injected into the sprue 26 from the nozzle 32 of the injection cylinder 31 in the mold clamping state of FIGS. Two products 1 are formed by filling the cavity 22 and the second cavity 24 via the first supply path 23, the communication path 34 and the second supply path 25.
[0021]
In releasing the mold, as shown in FIGS. 8 and 9, the small operating cylinder 40 is operated, the inlet 35 of the communication passage 34 is closed by the pin-like valve body 39, and the operating circuits of the sub operating cylinders 19 are closed. The main movable cylinder 13 is operated and the first movable mold 6 and the second movable mold 9 are moved backward in a state where the molds 6 and 9 are closed, thereby fixing the fixed mold 4 and the first movable mold 6. The product 1 molded by the first cavity 22 is taken out with a gap.
[0022]
Since the outlet 30 and the first supply path 23 of the sprue 26 are non-heated regions, the melt molding material present in them is hardened to become a scrap part 47, and the scrap part 47 together with the product 1 has the outlet 30 and the first supply path. Leave 23. Further, when the molten molding material m located in the heating region of the sprue 26 is slightly protruded outlet 30, where its inner peripheral surface has a tapered hole, that is, area of the cooling surface in contact with the molten molding material m is extended And since it is a non-heating area | region, a protrusion part becomes high viscosity immediately, and it acts as a plug, and, thereby, the leakage of the molten molding material m from the exit 30 of the sprue 26 is prevented. Further, in the communication path 34, the inlet 35 is closed by the pin-shaped valve body 39, so that leakage of the molten molding material m from the inlet 35 is also prevented. Next, as shown in FIGS. 10 and 11, both the sub-actuating cylinders 19 are operated, the first movable mold 6 is advanced, the space between the fixed mold 4 and the first movable mold 6 is closed, and the first movable mold 6 and the second movable mold 6 are closed. The movable mold 9 is opened and the product 1 molded by the second cavity 24 is taken out. Since the outlet 36 and the second supply path 25 of the communication path 34 are non-heated regions, the melt molding material present in them is hardened to become a scrap part 47, and the scrap part 47 together with the product 1 is supplied to the outlet 36 and the second supply. Leave the road 25. Further, when the molten molding material m in the heating area of the communication passage 34 is slightly protruded outlet 36, in the same manner as described above, there the inner peripheral surface has a tapered hole, i.e. the cooling surface in contact with the molten molding material m Since the area is expanded and the region is a non-heated region, the protruding portion immediately becomes highly viscous and serves as a plug, thereby preventing leakage of the molten molding material m from the outlet 36 of the communication path 34. In addition, since the inlet 35 of the communication path 34 is closed by the pin-shaped valve body 39, the molten molding material m does not leak.
[0023]
When the molds are opened in the order as described above and the two products 1 are taken out, compared to the case where the fixed mold 4 and the first movable mold 6 and the first and second movable molds 6 and 9 are opened simultaneously. Thus, the space between the fixed mold 4 and the second movable mold 9 in the mold open state can be made small, thereby making it possible to effectively use the factory space. This becomes conspicuous when the product 1 has a deep bowl shape as in the embodiment, that is, when the length of the product 1 in the mold opening / closing direction is long.
[0024]
At the start of the second and subsequent injection moldings, the inlet 35 of the communication passage 24 is closed by the pin-shaped valve body 39 as shown in FIG. 11, and this closed state is shown in FIG. The outlet 30 of the sprue 26 and the lower part of the first supply path 23 are filled and held until the surface exceeds the inlet 35. When such a method is employed, in FIG. 11, the air in the outlet 30 of the sprue 26 and the air in the first supply passage 23 enter the communication passage 34 together with the molten molding material m from the sprue 26 to generate defective products. The trouble can be avoided.
[0025]
【The invention's effect】
According to the present invention, the distance between the fixed mold and the second movable mold in the mold open state is compared with the conventional case where the fixed mold and the first movable mold and the first and second movable molds are simultaneously opened. This makes it possible to effectively use the factory space.
[0026]
In particular, since the injection cylinder can be disposed and fixed on the fixed mold side, the weight of the first movable mold can be reduced, the wear of the sliding portion can be reduced, and the mold structure can be simplified.
[0027]
Further, in the first movable mold, there is a communication path for communicating between the sprue outlet and the second cavity, a valve device capable of opening and closing the inlet of the communication path, and the communication path between the inlet and the outlet of the communication path. A heater for heating the molding material to keep it in a molten state, a supply path formed between the mating surfaces of the first movable mold and the second movable mold and communicating between the second cavity and the communication path outlet; The outlet of the communication path is a non-heated area, and the scrap portion corresponding to the supply path and the outlet can be taken out integrally with the product when the first and second movable molds are opened. When the molten molding material in the heating area of the communication path slightly protrudes to the outlet of the communication path when the product is taken out, the protruding portion immediately becomes highly viscous because the outlet is a non-heated area. It serves as a stopper, which It prevents leakage of melt molding material, while communicating passage inlet does not occur leakage of molten molding material because it is closed by the valve device. At the start of the next injection molding, the communication passage inlet is closed by a valve device, and this closed state is maintained until the molten molding material from the sprue fills the sprue outlet and exceeds the level of the inlet. It is possible to avoid a problem that a defective product is generated by entering into the communication path together with the melt molding material from the sprue.
[Brief description of the drawings]
1 is a perspective view of a product. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a side view of an injection molding apparatus partially broken. 5 is a side view showing a clamping state of the injection molding apparatus. FIG. 6 is an enlarged cross-sectional view of the main part corresponding to FIG. 5. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. FIG. 9 is an enlarged cross-sectional view of a main part corresponding to FIG. 8; FIG. 10 in the injection molding apparatus, between the fixed mold and the first movable mold; On the other hand, FIG. 11 is a side view showing a state in which the first and second movable molds are opened. FIG. 11 is an enlarged cross-sectional view of a main part corresponding to FIG. Sectional enlarged view [Explanation of symbols]
1 Product 2 Injection molding equipment (molding equipment)
4 fixed mold 6 first movable mold 9 second movable mold 22 first cavity 24 second cavity
25 Second supply path (supply path)
26 sprue
30 sprue outlet 31 injection cylinder 32 nozzle
33 heater 34 communication path
35 passage entrance
36 passage exit
47 scrap section

Claims

A fixed mold (4), a first movable mold (6) facing the fixed mold (4), a second movable mold (9) facing the first movable mold (6), and a fixed mold (4) And at least one product forming first cavity (22) provided between the mating surfaces (3, 5) of the first movable mold (6), the first movable mold (6) and the second movable mold (9). A molding device (2) comprising at least one product molding second cavity (24) provided between the mating surfaces (7, 8) of
After the molding operation, the first movable mold (6) and the second movable mold (9) are moved in a state where the two molds (6, 9) are closed, so that the fixed mold (4) and the first movable mold ( 6) Open the space to remove the product (1) from the first cavity (22), and then move the first movable mold (6) to move between the fixed mold (4) and the first movable mold (6). In closing and opening the first movable mold (6) and the second movable mold (9) to take out the product (1) from the second cavity (24),
An injection cylinder (31) capable of injecting a molten molding material is fixed to the fixed mold (4), and a gap between the nozzle (32) and the first cavity (22) of the injection cylinder (31) is fixed. A sprue (26) for communication is formed in the stationary mold (4),
In the first movable mold (6), the outlet (30) of the sprue (26 ) and the second cavity (with the fixed mold (4) and the first and second movable molds (6, 9) closed ) 24) a communication path (34) communicating with each other, and a communication path (34) communicating with the outlet (30) of the sprue (26) in a state where the fixed mold (4) and the first movable mold (6) are closed. Between the inlet (35) and the outlet (36) of the communication passage (34) and the molding material in the communication passage (34) is kept in a molten state. A heater (37) for heating as much as possible,
Between the both movable surfaces (7, 8) of the first movable mold (6) and the second movable mold (9), the second cavity (24) is in a state in which both movable molds (6, 9) are closed. And a supply path (25) that communicates between the outlet and the outlet (36) of the communication path (34),
The outlet (36) of the supply path (25) and the communication path (34) is a non-heated region, and the scrap portion (47) corresponding to the supply path (25) and the outlet (36) is the first and The molding apparatus characterized in that it can be taken out integrally with the product (1) when the second movable mold (6, 9) is opened .