JPH0376618A - Synthetic resin-injection molding process with no runner and cold runner and its device - Google Patents
Synthetic resin-injection molding process with no runner and cold runner and its deviceInfo
- Publication number
- JPH0376618A JPH0376618A JP21305389A JP21305389A JPH0376618A JP H0376618 A JPH0376618 A JP H0376618A JP 21305389 A JP21305389 A JP 21305389A JP 21305389 A JP21305389 A JP 21305389A JP H0376618 A JPH0376618 A JP H0376618A
- Authority
- JP
- Japan
- Prior art keywords
- molten resin
- pressure
- injection
- volume
- pressure holding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims description 48
- 229920005989 resin Polymers 0.000 claims abstract description 194
- 239000011347 resin Substances 0.000 claims abstract description 194
- 230000007246 mechanism Effects 0.000 claims abstract description 67
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 238000000465 moulding Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims description 92
- 239000007924 injection Substances 0.000 claims description 92
- 239000002994 raw material Substances 0.000 claims description 29
- 229920003002 synthetic resin Polymers 0.000 claims description 18
- 239000000057 synthetic resin Substances 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims 2
- 238000007789 sealing Methods 0.000 claims 2
- 238000005538 encapsulation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 26
- 238000002360 preparation method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 21
- 230000009471 action Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 210000003323 beak Anatomy 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B29C45/57—Exerting after-pressure on the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、射出、保圧のコンピュータなどによる高価
な多段階制御を排除して、かつ、無段階で自動的に働く
簡単で高能率な保圧支援手段を備えた保圧工程を行わせ
ると共に、この保圧工程と全く無関係にスクリューの再
可塑化工程を同時に行わせて、全体として成形サイクル
が画期的に高速でしかも一速一圧というきわめて単純な
手段と簡易な構成で実施できる新規なランナーレスおよ
びコールドランナー合成樹脂射出成形方法ならびにそれ
らの装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] This invention eliminates the need for expensive multi-step control using a computer for injection and pressure holding, and provides a simple and highly efficient system that operates automatically without any steps. By performing a pressure holding process equipped with a pressure holding support means and at the same time performing a screw replasticization process completely unrelated to this pressure holding process, the entire molding cycle can be made at a revolutionary high speed and one speed at a time. The present invention relates to a new runnerless and cold runner synthetic resin injection molding method that can be carried out using extremely simple pressure means and a simple configuration, and an apparatus therefor.
従来、この種の合成樹脂成形方法にあっては、例えば、
特開昭６３−１８８０２５号公報が知られている。Conventionally, in this type of synthetic resin molding method, for example,
Japanese Unexamined Patent Publication No. 63-188025 is known.
この従来技術は、スクリューを回転及び往復動させるこ
とでノズルより溶融樹脂を金型のキャビティ内に充填す
る射出成形機において、予め設定したスクリュー位置と
なると予め設定した射出速度となるようにノズルの開口
面積を制御すると同時にそのノズルの前後の差圧が予め
設定した設定差圧となるようにスクリューの応力を制御
するようにしたことを技術内容とするもので、ノズルの
前後の差圧設定は、例えばノズルバルブを用い、その開
口面積を多段階に調節して、最適な流量制御を行うよう
にしている。This conventional technology is used in an injection molding machine that fills a mold cavity with molten resin from a nozzle by rotating and reciprocating a screw. The technology is to control the opening area and at the same time to control the stress of the screw so that the differential pressure before and after the nozzle becomes a preset differential pressure. For example, a nozzle valve is used and its opening area is adjusted in multiple stages to achieve optimal flow control.
そして、精密成形においては、射出操作から保圧に至る
プロセスの７〜８段に及ぶ多段階コントロールが一般に
成形品質の良否を決定すると考えられており、上述の先
行側以外でも高価なコンピュータを用いて可塑化された
原料樹脂に対する射出成形を行っているのが現状である
。In precision molding, it is generally believed that multi-step control over seven to eight stages of the process, from injection operation to pressure holding, determines the quality of the molding. Currently, injection molding is performed using plasticized raw material resin.
ところで、射出成形機により可塑化された原料樹脂は、
粘弾性流体のため、一般に射出プロセスにおける流動挙
動とその制御は大変複雑であり、数値的解析は困難であ
る以上に現状では射出操作後、保圧を適正に附与しない
と高精度、高品質の成形品は得られないと云われている
。By the way, the raw resin plasticized by the injection molding machine is
Because it is a viscoelastic fluid, the flow behavior and its control during the injection process are generally very complex, and numerical analysis is difficult.Currently, high precision and high quality cannot be achieved unless holding pressure is properly applied after the injection operation. It is said that molded products cannot be obtained.
上述の従来例では、ノズルの開口面積を例えばバルブに
よって制御し、この制御は予め設定した値を以って射出
、保圧を多段階に制御しなければならないので高価なコ
ンピュータなどを備えたコントローラを必要とし、コス
ト高は避けられないし、さらに射出、保圧が完了するま
で待たせなければ、スクリューを次のサイクルに備えて
可塑化動作に移行させることは不可能であるから成形サ
イクルを短縮できない欠点があった。In the conventional example described above, the opening area of the nozzle is controlled by, for example, a valve, and this control requires multi-step control of injection and holding pressure using preset values, so a controller equipped with an expensive computer is required. In addition, the molding cycle is shortened because it is impossible to shift the screw to plasticizing operation in preparation for the next cycle unless the injection and pressure holding are completed. There was a drawback that it could not be done.
そこで、このような欠点を解決するものとして本発明者
は、特願平１−１３４５７６号の発明を提案し、高価な
コンピュータを備えたコントローラとか複雑な制御を行
うことなく、所謂−速一圧というきわめて簡単な謂わば
無段階制御で高精度、高精密な成形品を得るようにする
と共に、さらには射出が終り保圧時間を短縮して爾後の
冷却工程の開始時間を早めることができ、これにより、
型開工程、取出工程からつぎの型締工程を経て射出成形
される一回の成形サイクル時間を短縮でき、成形物にも
よるが１０〜３０％も大幅に短縮できてハイ・サイクル
成形が実現できる新規な合成樹脂射出成形方法およびそ
の装置を提供した。Therefore, in order to solve these drawbacks, the present inventor proposed the invention of Japanese Patent Application No. 1-134576. This extremely simple, so-called stepless control not only allows high-precision, high-precision molded products to be obtained, but also shortens the pressure holding time after injection is completed, thereby speeding up the start time of the subsequent cooling process. This results in
The molding cycle time for injection molding from the mold opening process and removal process to the next mold clamping process can be shortened, and depending on the molded product, the time can be significantly shortened by 10 to 30%, achieving high cycle molding. We have provided a new synthetic resin injection molding method and equipment.
そしてさらに、上述の成形サイクルの６短縮化の他に、
型締力の大きさに無関係に可塑化手段の小型化、および
可塑化手段の時間を従来に比し格段も長く取ることがで
きることによる可塑溶融化の効率向上、精密成形の品質
向上に役立つなどの幾多の効果があることを開示した。Furthermore, in addition to shortening the molding cycle by 6,
Regardless of the magnitude of the mold clamping force, the plasticizing means can be made smaller and the time of the plasticizing means can be taken much longer than before, which improves the efficiency of plastic melting and improves the quality of precision molding. It was disclosed that there are many effects of
この発明は、先願である前記特願平１−１３４５７６号
の発明における溶融樹脂保圧手段の機能を、より有効に
働かせるようにしたことを課題とするものである。The object of this invention is to make the function of the molten resin pressure holding means in the invention of the earlier patent application No. 1-134576 work more effectively.
すなわち、この発明は、溶融樹脂保圧手段の働きを有効
にして、より均一な高精密度の成形を可能とし、かつ成
形サイクルの短縮化をより効率に働かせて、究極の射出
成形方法およびその装置を得ることを目的とするもので
ある。That is, this invention makes the function of the molten resin pressure retention means effective, enables more uniform high-precision molding, and shortens the molding cycle more efficiently, thereby creating the ultimate injection molding method and its method. The purpose is to obtain a device.
この発明は、原料樹脂の加熱溶融手段により加熱溶融さ
れた原料を、所望の射出手段の射出操作により予め所望
の容積を計測して与えて保圧支援機構を有する溶融樹脂
保圧手段を介して一以上のキャビティ内にゲートを経て
射出成形する都度、前記射出手段で射出される溶融樹脂
の量を、前記溶融樹脂保圧手段の容積に対応して定まる
原料樹脂の圧縮限界内の少容量を加算した値に計量して
前記溶融樹脂保圧手段内に押入して射出手段との流通を
遮断し、この溶融樹脂保圧手段内に、前記原料溶融樹脂
の圧縮限界内の少量の封入による保圧力を保有させて前
記保圧支援機構の働きにより前記キャどティ内への原料
樹脂の保圧を行うようにしたことを特徴とするランナー
レス合成樹脂射出成形方法に係り、またこの発明は、原
料樹脂の加熱溶融手段により加熱溶融された原料を、所
望の射出手段の射出操作により予め所望の容積を計測し
て与えて保圧支援機構を有する溶融樹脂保圧手段を介し
てスプルーランナー部より一以上のキャビティ内にゲー
トを経て射出成形する都度、前記射出手段で射出される
溶融樹脂の量を、前記溶融樹脂保圧手段の容積に対応し
て定まる原料樹脂の圧縮限界内の少量を加算した値に計
量して前記溶融樹脂保圧手段内に押入して射出手段との
流通を遮断し、この溶融樹脂保圧手段内に、前記原料溶
融樹脂の圧縮限界内の少量の封入による保圧力を保有さ
せて前記保圧支援機構の働きにより前記スプルーランナ
ー部よりキャビティ内への原料樹脂の保圧を行うように
したことを特徴とするコールドランナー合成樹脂射出成
形方法に係る。In this invention, the raw material heated and melted by the raw material resin heating and melting means is measured and given in advance to a desired volume by the injection operation of the desired injection means, and the raw material is supplied through the molten resin pressure holding means having a pressure holding support mechanism. Each time injection molding is carried out through a gate into one or more cavities, the amount of molten resin injected by the injection means is set to a small volume within the compression limit of the raw resin, which is determined corresponding to the volume of the molten resin pressure holding means. The added value is weighed and pushed into the molten resin pressure holding means to cut off communication with the injection means, and a small amount of the raw material molten resin is sealed within the compression limit in the molten resin pressure holding means. The present invention relates to a runnerless synthetic resin injection molding method characterized in that pressure is maintained and the pressure of the raw resin is held in the cavity by the function of the pressure holding support mechanism, and the present invention also includes: The raw material heated and melted by the raw material resin heating and melting means is given to a desired volume by the injection operation of the desired injection means, and is then transferred from the sprue runner section through the molten resin pressure holding means having a pressure holding support mechanism. Each time injection molding is carried out through a gate into one or more cavities, the amount of molten resin injected by the injection means is added by a small amount within the compression limit of the raw resin determined corresponding to the volume of the molten resin pressure holding means. A small amount of the raw molten resin within the compression limit is sealed in the molten resin pressure means, and the holding pressure is increased by inserting the molten resin into the pressure holding means to cut off the communication with the injection means. The present invention relates to a cold runner synthetic resin injection molding method, characterized in that the pressure holding support mechanism holds the raw material resin from the sprue runner portion into the cavity.
さらに、この発明は、原料樹脂の加熱溶融手段により加
熱溶融された原料を、所望の射出手段の射出操作により
予め所望の容積を計測して与えて保圧支援機構を有する
溶融樹脂保圧手段を介して一以上のキャビティ内にゲー
トを経て射出成形する都度、前記射出手段で射出される
溶融樹脂の量を、前記溶融樹脂保圧手段の容積に対応し
て定まる原料溶融樹脂の圧縮限界内の少量を加算した値
に計量して前記溶融樹脂保圧手段内に押入して射出手段
との流通を遮断し、この溶融樹脂保圧手段内に、前記原
料溶融樹脂の圧縮限界内の少量の封入による保圧力を保
有させて前記保圧支援機構の働きにより前記キャビティ
内への原料樹脂の保圧を行うと共にキャビティでの成形
品取出時、溶融樹脂保圧手段に残留する保圧力を射出手
段の後退に基づく前記溶融樹脂保圧手段の容積増加によ
って消失させ、前記成形品取出後、溶融樹脂保圧手段と
の流通を開放して射出手段を前進させて溶融樹脂保圧手
段の容積を元の容積に戻し、つぎの射出成形操作を反覆
して行うようにしたことを特徴とするランナーレス合成
樹脂射出成形方法に係り、またこの発明は、原料樹脂の
加熱溶融手段により加熱溶融された原料を、所望の射出
手段の射出操作により予め所望の容積を計測して与え保
圧支援機構を有する溶融樹脂保圧手段を介してスプルー
ランナー部より一以上のキャビティ内にゲートを経て射
出成形する都度、前記射出手段で射出される溶融樹脂の
量を、前記溶融樹脂保圧手段の容積に対応して定まる原
料溶融樹脂の圧縮限界内の少量を加算した値に計量して
前記溶融樹脂保圧手段内に押入して射出手段との流通を
遮断し、この溶融樹脂保圧手段内に、前記原料溶融樹脂
の圧縮限界内の少量の封入による保圧力を保有させて前
記保圧支援機構の働きにより前記スプルーランナー部よ
りキャビティ内への原料樹脂の保圧を行うと共にキャビ
ティでの成形品をスプルーランナーを含めて取出時、溶
融樹脂保圧手段に残留する保圧力を射出手段の後退に基
づく前記溶融樹脂保圧手段の容積増加によって消失させ
、前記成形品およびスプルーランナー取出後、溶融樹脂
保圧手段との流通を開放して射出手段を前進させて溶融
樹脂保圧手段の容積を元の容積に戻し、つぎの射出成形
操作を反覆して行うようにしたことを特徴とするコール
ドランナー合成樹脂射出成形方法に係る。Furthermore, the present invention provides a molten resin pressure retention means having a pressure retention support mechanism, in which a desired volume of the raw material heated and melted by the raw material resin heating and melting means is measured and given in advance by an injection operation of a desired injection means. Each time injection molding is performed through a gate into one or more cavities through a gate, the amount of molten resin injected by the injection means is within the compression limit of the raw molten resin, which is determined corresponding to the volume of the molten resin pressure holding means. A small amount is added to the value and is pushed into the molten resin pressure holding means to cut off communication with the injection means, and a small amount within the compression limit of the raw material molten resin is sealed in the molten resin pressure holding means. The retaining pressure support mechanism retains the pressure of the raw material resin in the cavity, and when the molded product is taken out from the cavity, the retaining force remaining in the molten resin retaining means is transferred to the injection means. The volume of the molten resin pressure retention means is increased due to the retreat, and after the molded product is taken out, the communication with the molten resin pressure retention means is opened and the injection means is advanced to return the volume of the molten resin pressure retention means to its original value. The present invention relates to a runnerless synthetic resin injection molding method characterized in that the volume is returned to the original volume and the next injection molding operation is repeated. , Each time injection molding is performed from the sprue runner section into one or more cavities through a gate via a molten resin pressure holding means having a pressure holding support mechanism, which measures and applies a desired volume in advance by an injection operation of a desired injection means, The amount of molten resin injected by the injection means is measured by adding a small amount within the compression limit of the raw molten resin determined corresponding to the volume of the molten resin pressure holding means, and the amount is measured into the molten resin pressure holding means. The molten resin pressure holding means is made to hold a holding force by enclosing a small amount of the raw material molten resin within the compression limit, and the pressure holding support mechanism works to hold the holding force. The pressure of the raw resin is held in the cavity from the sprue runner part, and when the molded product in the cavity is taken out including the sprue runner, the holding force remaining in the molten resin pressure holding means is reduced by the retraction of the injection means. After the molded product and the sprue runner are taken out, communication with the molten resin pressure means is opened and the injection means is advanced to return the volume of the molten resin pressure means to its original volume. The present invention relates to a cold runner synthetic resin injection molding method characterized in that the following injection molding operations are repeated.
そして、さらに、この発明は原料樹脂を加熱溶融する可
塑化機構を備えた射出手段と、弁開閉手段と、調圧機構
を備えたピストンを有し、シリンダー容積を可変にして
働く保圧支援手段を組み込んだ保圧力を保有し得る溶融
樹脂保圧手段と、以上のゲートとキャビティで形成され
る成形物金型手段とより成り、前記弁開閉手段の弁開閉
操作と、前記溶融樹脂保圧手段の容積変化に伴う保圧力
の封じ込めと解放との操作を射出成形操作の都度行うよ
うにして成ることを特徴とするランナーレス合成樹脂射
出成形装置に係り、また、この発明は原料樹脂を加熱溶
融する可塑化機構を備えた射出手段と、弁開閉手段と、
調圧機構を備えたピストンを有し、シリンダー容積を可
変して働く保圧支援手段を組み込んだ保圧力を保有し得
る溶融樹脂保圧手段と、一以上のゲートとキャビティと
スプルーランナー部で形成される成形物金型手段とより
成り、前記弁開閉手段の弁開閉操作と、前記溶融樹脂保
圧手段の容積変化に伴う保圧力の封じ込めと解放との操
作を射出成形操作の都度行うようにして成ることを特徴
とするコールドランナー合成樹脂射出成形装置に係る。Further, the present invention has an injection means equipped with a plasticizing mechanism for heating and melting the raw resin, a valve opening/closing means, and a piston equipped with a pressure regulating mechanism, and a pressure holding support means that operates by varying the cylinder volume. A molten resin pressure holding means capable of holding a holding force incorporating the above, and a molding mold means formed by the above gate and cavity, the valve opening/closing operation of the valve opening/closing means, and the molten resin pressure holding means The present invention relates to a runnerless synthetic resin injection molding apparatus characterized in that the operation of confining and releasing the holding force as the volume changes is performed each time an injection molding operation is performed. an injection means equipped with a plasticizing mechanism; a valve opening/closing means;
It has a piston equipped with a pressure regulating mechanism and is formed by a molten resin pressure retention means capable of retaining pressure that incorporates a pressure retention support means that works by varying the cylinder volume, one or more gates, cavities, and a sprue runner section. The valve opening/closing operation of the valve opening/closing means and the containment and release of the holding force accompanying a change in the volume of the molten resin pressure holding means are performed each time an injection molding operation is performed. The present invention relates to a cold runner synthetic resin injection molding apparatus characterized by comprising: a cold runner synthetic resin injection molding apparatus;
まず、所望の原料樹脂を可塑化機構で加熱溶融する。 First, a desired raw material resin is heated and melted using a plasticizing mechanism.
つぎに、射出手段で溶融樹脂を射出するのに先立って、
一以上のキャビティの容積の総和に対して、コールドラ
ンナ一方式でスプルーランナーを生ずる時は、スプルー
ランナーを含めた容積に、溶融樹脂保圧手段内の容積を
加減して、前記キャビティの容積の総和と等しく与える
ように予め計測した値を与えて設けておき、さらにその
溶融樹脂保圧手段内にはその溶融樹脂保圧手段の予め計
測された容量（この例の場合は、キャビティの容積の総
和と等しくとっである。ただしこの等容積関係は１例で
あって厳密なものではない）に対応して定まる原料溶融
樹脂の圧縮限界内の少量を加算した値を計量する。Next, prior to injecting the molten resin with the injection means,
When creating a sprue runner using a single cold runner, the volume of the molten resin pressure retaining means is adjusted to the volume including the sprue runner, and the volume of the cavity is calculated based on the total volume of one or more cavities. A pre-measured value is provided so as to be equal to the total sum, and a pre-measured volume of the molten resin pressure-holding means (in this example, the volume of the cavity) is provided in the molten resin pressure-holding means. (However, this equal volume relationship is just an example and is not strict.) The value obtained by adding a small amount within the compression limit of the raw material molten resin is measured.
すでに溶融樹脂保圧手段内には予め封入しである準備段
階の溶融樹脂が滞溜しているので、射出された前記溶融
樹脂は弁開閉手段を経て前記溶融樹脂保圧手段内に送出
される。Since the molten resin sealed in advance has already accumulated in the molten resin pressure holding means, the injected molten resin is sent into the molten resin pressure holding means through the valve opening/closing means. .
ところで、溶融樹脂保圧手段には保圧支援機構を備え、
この機構は、ばね機構を備えたピストンとシリンダーと
で構成されているので、射出手段による原料溶融樹脂の
圧縮限界内の少量外、すなわち過剰の原料溶融樹脂は、
瞬間的に前記保圧支援機構の調圧機構を弾性的に附勢さ
せた状態でピストンを変位させ、この変位で得られるシ
リンダー内の小空間内に封じ込まれる。By the way, the molten resin pressure holding means is equipped with a pressure holding support mechanism,
Since this mechanism is composed of a piston and a cylinder equipped with a spring mechanism, a small amount of raw molten resin outside the compression limit of the raw molten resin by the injection means, that is, an excess of the raw molten resin is
The piston is momentarily displaced while the pressure regulating mechanism of the pressure holding support mechanism is elastically energized, and the piston is enclosed in a small space within the cylinder created by this displacement.
なを、予め溶融樹脂を保圧手段内に封入滞溜している溶
融樹脂は急速にゲートを経て一以上のキャビティ内に射
出される。Furthermore, the molten resin that has been previously sealed and accumulated in the pressure holding means is rapidly injected into one or more cavities through the gate.
ところで、前記射出手段による射出操作では、射出操作
終了と同時に弁開閉手段が働いて弁を閉じ、支援機構を
含めて溶融樹脂保圧手段内に原料溶融樹脂の圧縮限界内
の少容量の溶融樹脂を強制的に封じ込めているので、前
記支援機構と合せて前記溶融樹脂保圧手段内には容積増
加分に相当する保圧力が自動的に附与され、弁開閉手段
の弁閉によって専らキャビティに向ってその保圧力が自
動的かつ無段階に作用する。By the way, in the injection operation by the injection means, the valve opening/closing means operates to close the valve at the same time as the injection operation ends, and a small volume of molten resin within the compression limit of the raw molten resin is contained in the molten resin pressure holding means including the support mechanism. is forcibly contained, so together with the support mechanism, a holding force corresponding to the volume increase is automatically applied to the molten resin holding means, and by closing the valve opening/closing means, the holding force is applied exclusively to the cavity. In turn, the holding force acts automatically and steplessly.
すなわち、弁閉後からキャビティ内に向って、作用する
保圧力は前記保圧支援機構の附勢された調圧機構の張力
を受けてピストンはシリンダー内の溶融樹脂を押出し、
これが無段階の保圧力として作用し、キャビティ内には
流体挙動に無理を生ずることなく、理想的な保圧作用が
行われて射出と保圧が完了してキャビティ内への完全な
樹脂の充填を終える。That is, after the valve is closed, the holding force that acts toward the inside of the cavity receives the tension of the energized pressure regulating mechanism of the pressure holding support mechanism, and the piston pushes out the molten resin in the cylinder.
This acts as a stepless holding force, and the ideal holding pressure action is performed without causing any strain on the fluid behavior within the cavity, completing injection and holding pressure and completely filling the cavity with resin. finish.
つぎに、キャビティ内の射出された溶融樹脂の冷却固化
またはスプルーランナー部でのスプルーランナーを含め
た射出樹脂の冷却固化が進行する。Next, the injected molten resin in the cavity is cooled and solidified, or the injected resin including the sprue runner is cooled and solidified in the sprue runner section.
上述の状態では、溶融樹脂保圧手段内にはまだ保圧力を
残留しているので、型開操作前に射出手段を後退させて
溶融樹脂保圧手段内の容積を増加し、保圧力を消失させ
ることができる。In the above state, there is still some holding force left in the molten resin holding means, so before the mold opening operation, the injection means is moved back to increase the volume inside the molten resin holding means and the holding force disappears. can be done.
そして、保圧支援機構も最初の位置まで復帰する。Then, the pressure holding support mechanism also returns to its initial position.
保圧力が消失すればキャビティまたはスプルーランナー
部へ保圧力が作用しなくなるので前記射出手段の後退と
同時か、その過程中に速やかに型開操作が行われ、成形
品の取出と再び型締操作が行われる。If the holding force disappears, the holding force will no longer act on the cavity or sprue runner, so the mold opening operation will be performed at the same time as the injection means retracts or immediately during that process, and the molded product will be removed and the mold clamping operation will be performed again. will be held.
他方、射出操作を終えた射出手段は、弁開閉機構の弁閉
によって射出、保圧の工程とは全く無関係につぎの射出
準備にはいることができる。したがって、原料樹脂の可
塑化操作に要する時間を、従来に比し十分艮〈取ること
ができるので樹脂の可塑化溶融状態をきわめて理想的な
状態として得ることができる。On the other hand, the injection means that has completed the injection operation can prepare for the next injection, completely unrelated to the injection and pressure holding steps, by closing the valve of the valve opening/closing mechanism. Therefore, the time required for the plasticizing operation of the raw resin can be taken much longer than in the past, so that the plasticized and molten state of the resin can be obtained in an extremely ideal state.
従来は、射出、保圧工程が終るまで、スクリューは次の
可塑化工程に移行出来ず、その待ち時間分だけ可塑化時
間が短かくなり、そのため、成形サイクルを早めるため
には可塑化機構を含めた射出手段を大型化しなければな
らないという欠点があった。Conventionally, the screw could not proceed to the next plasticizing process until the injection and pressure holding processes were completed, and the plasticizing time was shortened by the waiting time. Therefore, in order to speed up the molding cycle, a plasticizing mechanism was There was a drawback that the included injection means had to be enlarged.
また、この発明では上述のように溶融樹脂保圧手段は、
保圧支援機構を含めて残留保圧力の消失のために容積を
増加しているので、つぎの成形操作に入る前に弁開閉機
構の弁を開いて射出手段を前進させて溶融樹脂保圧手段
内の溶融樹脂の一部少量を射出手段内に戻すことにより
元の容積に復帰させることができる。Further, in this invention, as mentioned above, the molten resin pressure holding means is
Since the volume including the pressure holding support mechanism is increased to eliminate the remaining reserved pressure, before starting the next molding operation, the valve of the valve opening/closing mechanism is opened to advance the injection means and the molten resin pressure holding means is increased. The original volume can be restored by returning a small amount of the molten resin inside into the injection means.
そして引続き、射出手段内に戻された少量の溶融樹脂を
含めて射出手段内での可塑化樹脂の容積計量は、最初と
同様にランナーレス方式またはコールドランナ一方式の
成形操作の射出成形の都度毎回繰り返される。Subsequently, the volumetric metering of the plasticized resin in the injection means, including the small amount of molten resin returned into the injection means, is carried out as before for each injection molding operation in a runnerless or cold runner molding operation. repeated every time.
以下に、この発明の一実施例をランナーレス射出成形方
法およびその装置に施した場合についてを図面と共に説
明する。EMBODIMENT OF THE INVENTION Below, the case where one Example of this invention is applied to the runnerless injection molding method and its apparatus is demonstrated with drawing.
１は原料樹脂を加熱溶融できる既存の可塑化機構（図示
せず）を備えた射出手段の射出機構を示し、射出スクリ
ュー２をシリンダー３内で出入自在に配設しである。４
はこの射出機構１のノズル、５は弁開閉機構に相当する
弁を示し、前記射出機構１のノズル先端に固着した先端
部６の射出孔７内に設けである。８は前記先端部６が進
退自在に挿通される溶融樹脂保圧手段Ｘの樹脂滞溜部で
固定金型１０に取付けである。この樹脂滞溜部８の容積
はホットマニホールド１１の湯道９とホットランナ−１
２の総容積を合算して、キャビティ１３の総容積と等容
積になるように計測して設けることを１つの目安として
所望の容積でよい。９は前記樹脂滞溜部８と連通する固
定金型１０に設けられるホットマニホールド１１の湯道
、１２はさらに該湯道９と通ずるホットランナ一部、１
３はゲート１４を有する一以上のキャビティ、１５は該
キャビティ１３を前記固定金型１０と共に形成できる移
動金型を示す。Reference numeral 1 indicates an injection mechanism of an injection means equipped with an existing plasticizing mechanism (not shown) capable of heating and melting raw resin, and an injection screw 2 is disposed in a cylinder 3 so as to be freely retractable. 4
5 indicates a nozzle of this injection mechanism 1, and 5 indicates a valve corresponding to a valve opening/closing mechanism, which is provided in an injection hole 7 of a tip portion 6 fixed to the nozzle tip of the injection mechanism 1. Reference numeral 8 denotes a resin reservoir portion of the molten resin pressure holding means X through which the tip portion 6 is inserted so as to be movable forward and backward, and is attached to the fixed mold 10. The volume of this resin reservoir 8 is the same as that of the runner 9 of the hot manifold 11 and the hot runner 1.
One guideline is to measure and provide a volume equal to the total volume of the cavity 13 by adding up the total volumes of the cavities 13 and 2, and the desired volume may be used. 9 is a runner of a hot manifold 11 provided in the fixed mold 10 that communicates with the resin reservoir 8; 12 is a part of a hot runner that further communicates with the runner 9;
Reference numeral 3 indicates one or more cavities having a gate 14, and reference numeral 15 indicates a movable mold that can form the cavity 13 together with the fixed mold 10.
そして、前記溶融樹脂保圧手段Ｘは、図示のように弁５
からゲート１４までの溶融樹脂貯溜部分を以って形成さ
れている。The molten resin pressure holding means X includes a valve 5 as shown in the figure.
It is formed by the molten resin storage portion from to the gate 14.
Ｙは、前記溶融樹脂保圧手段Ｘの樹脂滞溜部８の一部に
配設される保圧支援手段を示しており、ピストンｐが摺
動するシリンダー９に配設され、かつピストンｐには調
圧機構としてコイル押ばねより成るばね機構Ｓがその鍔
部１６とピストンガイド１７が挿通される収容室１８内
に収納されて常時ピストンｐを樹脂滞溜部８側に向けて
働かせてシリンダーｑ内に臨ませて置くものである。前
記ばね機構Ｓは収容室１８のキャップ１９の螺合状態を
上下させてばね機構Ｓの張力を可変できるようになって
いる。なを、調圧機構は、油圧その他好みの構成で実施
できる。Y indicates a pressure holding support means disposed in a part of the resin reservoir 8 of the molten resin pressure holding means X, and is disposed in the cylinder 9 on which the piston p slides, and As a pressure regulating mechanism, a spring mechanism S consisting of a coil compression spring is housed in a housing chamber 18 into which the flange 16 and piston guide 17 are inserted, and the piston P is constantly moved toward the resin reservoir 8 side to open the cylinder. It is placed facing inside q. The tension of the spring mechanism S can be varied by raising and lowering the screwing state of the cap 19 of the storage chamber 18. Furthermore, the pressure regulating mechanism can be implemented using hydraulic pressure or any other desired configuration.
さらに、図において、２０は樹脂滞溜部８の外周に配設
したバンドヒータ、２１はランナ一部１２内に配置した
ホットチップ体で、いずれも未射出溶融樹脂の冷却固化
を防いでいる。２２は両金型１０，１５に貫通した冷却
水用孔、２３はピストンガイド１７の先端部１７ａの押
圧、解放によって開閉される各種制御回路のスイッチを
示す。Furthermore, in the figure, 20 is a band heater disposed around the outer periphery of the resin reservoir 8, and 21 is a hot chip body disposed within the runner part 12, both of which prevent the uninjected molten resin from cooling and solidifying. Reference numeral 22 indicates a cooling water hole penetrating through both the molds 10 and 15, and 23 indicates switches for various control circuits that are opened and closed by pressing and releasing the tip end 17a of the piston guide 17.
以上の構成に基づいて作用を説明する。The operation will be explained based on the above configuration.
射出機構１において、予め所望の原料樹脂を加熱溶融す
ると共に弁５を開いてこの弁５よりキャビティ１３のゲ
ート１４に至る間の溶融樹脂保圧手段Ｘ内に未射出の原
料溶融樹脂を封入して滞溜させて弁５を閉じて置く。In the injection mechanism 1, a desired raw material resin is heated and melted in advance, and a valve 5 is opened to seal the uninjected raw material molten resin in the molten resin pressure holding means X from the valve 5 to the gate 14 of the cavity 13. The water is allowed to stagnate and the valve 5 is closed.
所謂、上述の射出準備段階を終えてから弁５を開き、予
め一以上のキャビティ１３の容積の総和に原料溶融樹脂
の圧縮限界内の少容積を加算した計量値を以って射出手
段１を作動させて作動終了と同時に弁開閉機構の弁５を
閉しる。（第１図〜第３図参照）
すなわち、保圧支援手段Ｙを備えた溶融樹脂保圧手段Ｘ
内には、一以上のキャビティ１３の総和容量以上の原料
溶融樹脂の圧縮限界内の少容量を封じ込めたことによっ
て、自然発生的に保圧力が発生し、この保圧力が専らラ
ンナ一部１２よりゲート１４を経てキャビティ１３内に
自動的にしかも無段階に作用することとなる。（第３図
、第４図参照）
換言すれば、原料溶融樹脂の圧縮限界内の小容量の分が
、保圧支援手段Ｙのばね機構Ｓに抗してピストンＰをシ
リンダーｑ内で摺動させ、ピストンｐの摺動によって形
成される小空間内に収納されているため、閉弁操作後、
ばね機構Ｓの復元力が保圧力としてピストンｐに作用し
、シリンダーｑ内に封じ込められている小容量の溶融樹
脂を無段階に各キャビティ１３に対して作用するので保
圧力不足に基づくピケ（ボイド）の発生を防ぎ高精度の
樹脂充填が可能となる。After completing the so-called injection preparation stage described above, the valve 5 is opened, and the injection means 1 is injected using a measured value obtained by adding a small volume within the compression limit of the raw material molten resin to the total volume of one or more cavities 13 in advance. When the operation is completed, the valve 5 of the valve opening/closing mechanism is closed. (See Figures 1 to 3) In other words, molten resin pressure holding means X equipped with pressure holding support means Y
A holding force is generated naturally by confining a small volume within the compression limit of the raw molten resin, which is larger than the total capacity of one or more cavities 13, and this holding force is exclusively generated from the runner part 12. It acts automatically and steplessly into the cavity 13 through the gate 14. (See Figures 3 and 4) In other words, a small volume of raw molten resin within the compression limit causes the piston P to slide within the cylinder q against the spring mechanism S of the pressure retention support means Y. and is housed in a small space formed by the sliding movement of the piston p, so after the valve closes,
The restoring force of the spring mechanism S acts on the piston p as a holding force, and the small volume of molten resin sealed in the cylinder q acts steplessly on each cavity 13, thereby preventing pickets (voids) due to insufficient holding force. ) and enables highly accurate resin filling.
したがって、キャビティ１３内へは溶融樹脂保圧手段Ｘ
に対して他の保圧手段を全く必要とすることなく、適正
な保圧力を得てキャビティ１３内で溶融樹脂が精密に冷
却固化できるものである。Therefore, the molten resin pressure retaining means X
The molten resin can be precisely cooled and solidified within the cavity 13 by obtaining an appropriate holding force without requiring any other pressure holding means.
一方、弁５が閉じることによって直ちに射出手段１の射
出スクリュー２は後動し、つぎの溶融樹脂の加熱溶融と
射出量の計量が開始される。（第４図参照）従来は、ス
クリュー前方のスペースに貯溜される溶融樹脂のいわゆ
るクツション量を介して、スクリューの前進速度と圧力
を多段階に制御する方法であったために、保圧を利かせ
ている間はスクリューを後退させることは不可能であっ
た。保圧はゲート方向に働き、可塑化のためにスクリュ
ーには背圧をかけて後退させねばならない。すなわち、
保圧と背圧は圧力の作用方向は同軸上で真反対であった
矛盾を本発明は同時に解決する手段をも提供している。On the other hand, as soon as the valve 5 closes, the injection screw 2 of the injection means 1 moves backward, and the next heating and melting of the molten resin and metering of the injection amount are started. (See Figure 4) Conventionally, the forward speed and pressure of the screw were controlled in multiple stages through the so-called cushion amount of molten resin stored in the space in front of the screw, so it was difficult to maintain pressure. It was impossible to retract the screw during this period. Holding pressure acts in the direction of the gate, and back pressure must be applied to the screw to cause it to retreat for plasticization. That is,
The present invention also provides a means for simultaneously resolving the contradiction that holding pressure and back pressure are diametrically opposed to each other on the same axis.
これは可塑化機構の可塑化時間を十分提供できるので短
時間で大量の原料樹脂の可塑溶融化と射出手段１のスク
リュー２の小径小型化を実現するための最も有効な手段
である。他方、キャビティ１３内での成形品の冷却固化
後、移動金型１５を移動させて型開操作を開始する際、
溶融樹脂保圧手段Ｘ内には保圧力が残存しているので射
出機構１を後動させ先端嘴６の移動によって樹脂滞溜部
８の容積を増大させて消失させることができる。〈第５
図参照）ところで、型開操作は、溶融樹脂保圧手段Ｘの
容積増加を行う保圧力消失作用開始と同時またはそれ以
後てあれば時間的差異は格別問題とならない。This is the most effective means for plasticizing and melting a large amount of raw resin in a short period of time and for reducing the diameter of the screw 2 of the injection means 1, since it provides sufficient plasticizing time for the plasticizing mechanism. On the other hand, after the molded product is cooled and solidified in the cavity 13, when moving the movable mold 15 and starting the mold opening operation,
Since a holding force remains in the molten resin pressure holding means X, the injection mechanism 1 is moved backward and the tip beak 6 is moved to increase the volume of the resin reservoir 8 and eliminate it. <5th
(See figure) By the way, if the mold opening operation is performed at the same time as or after the start of the holding force dissipation action that increases the volume of the molten resin holding pressure means X, the time difference will not be a particular problem.
このようにしてキャビティ１３内の成形品は取り出すこ
とができる。In this way, the molded product inside the cavity 13 can be taken out.
つぎの型閉操作を行う過程で、射出機構１．の先端嘴６
に設けた弁５を開いて前進させて溶融樹脂保圧手段Ｘ内
の容積を最初の元の状態に戻す。In the process of performing the next mold closing operation, the injection mechanism 1. tip of beak 6
The valve 5 provided in the molten resin pressure holding means X is opened and moved forward to return the volume inside the molten resin pressure holding means X to its original state.
（第６図参照）
すなわち、溶融樹脂保圧手段Ｘ内の少量の溶融樹脂を射
出機構ｌのノズル４を経て逆流させ、既に計量段階にあ
りっぎの射出準備中の溶融樹脂と一体化させて最初と同
様に一以上のキャビティ１３の容積の総和に原料溶融樹
脂の圧縮限界内の少容積を加算した値として計量して次
の射出成形操作を行うことができる。(See Fig. 6) That is, a small amount of molten resin in the molten resin pressure holding means As in the first case, the next injection molding operation can be performed by measuring the sum of the volumes of one or more cavities 13 plus a small volume within the compression limit of the raw molten resin.
以下、前述したと全く同様の過程を経て連続したランナ
ーレス射出成形操作を行うことができる。Thereafter, a continuous runnerless injection molding operation can be performed through the same process as described above.
図示しないが、コールドランナーと一般に呼ばれるスプ
ルーランナー方式の合成樹脂成形装置およびその方法も
、前記した実施例の金型構成の一部を従来一般に知られ
る構成に変更することによって全く同様に実施できる。Although not shown, a sprue runner type synthetic resin molding apparatus and method generally called a cold runner can be implemented in exactly the same manner by changing a part of the mold structure of the above-described embodiment to a conventionally known structure.
なを、第１実施例において、ゲート１４を射出成形操作
完了の都度、局部的に冷却固化させてゲートを閉じるよ
うにし、つぎの射出成形操作の開始の都度、局部的に加
熱して固化した樹脂を加熱溶融させてゲートを開くよう
にしてゲート部のゲート開閉作用を間欠的に行わせるよ
うにすることもできる。超多数個取り金型における超多
数個のゲート１４を同時に開口させるのでなければ成形
品重量にバラツキがでて、精密成形ができないので、ゲ
ートの同時開口性に優れたゲートの電気的間欠加熱方法
をとることが有利である。Furthermore, in the first embodiment, each time the injection molding operation was completed, the gate 14 was locally cooled and solidified to close the gate, and each time the next injection molding operation was started, the gate 14 was locally heated and solidified. It is also possible to open and close the gate intermittently by heating and melting the resin to open the gate. If a large number of gates 14 in a multi-cavity mold are not opened at the same time, the weight of the molded product will vary and precision molding will not be possible. Therefore, an electrical intermittent heating method for gates that is excellent in simultaneous opening of gates. It is advantageous to take
さらに、この発明では、射出手段１により原料樹脂の圧
縮限界内の量を保圧支援手段Ｙを有する溶融樹脂保圧手
段Ｘ内に保圧力を発生させるために封じ込めているが、
圧縮限界は使用原料樹脂によって種々異なっているので
、必要以上に限界値までの大きな値に近づける必要はな
い。Furthermore, in this invention, the amount of the raw resin within the compression limit is confined by the injection means 1 in order to generate a holding pressure in the molten resin pressure holding means X having the holding pressure support means Y.
Since the compression limit varies depending on the raw material resin used, there is no need to make the compression limit any closer to the limit value than necessary.
また、溶融樹脂保圧手段Ｘの容積は、必ずしも特定する
必要はないが、一応の目安として、一以上のキャビティ
１３の総和の容積か、それ以上が好ましい。そして、キ
ャビティ１３の容積が大きい場合とかキャビティ１３の
数が多い場合、さらには複雑な形状を有する時は概して
容量が大きい方が保圧力を大きく保有できて形成性を高
めることができる。Further, the volume of the molten resin pressure holding means X does not necessarily need to be specified, but as a rough guide, it is preferably the total volume of one or more cavities 13 or more. When the volume of the cavities 13 is large, when the number of cavities 13 is large, or when the cavities 13 have a complicated shape, the larger the capacity, the greater the holding force can be held, and the formability can be improved.
また、さらに、保圧支持手段Ｙの構成は、ばね機構Ｓを
有するピストンｐおよびシリンダー９で構成されている
が、シリンダー９の径の大きさは保圧力の大さきに応じ
て任意好みの大きさに設定でき、小形で足りると共にピ
ストンＰに設けられるばね機構Ｓは、その張力を可変で
きるので、保圧力の不足分を補うことも可能である。Further, the structure of the pressure holding support means Y is composed of a piston p having a spring mechanism S and a cylinder 9, but the diameter of the cylinder 9 can be set to any desired size depending on the size of the holding force. The spring mechanism S provided on the piston P can be set to a small size, and the tension of the spring mechanism S provided on the piston P can be varied, so that it is possible to compensate for a lack of holding force.
この発明は、以上のように成るので、射出手段による射
出作用と保圧支援手段を備えた溶融樹脂保圧手段による
保圧力作用とが弁開閉機構のような閉弁操作によって溶
融樹脂の流通が遮断され、ことに精密成形には不可欠な
保圧力作用が溶融樹脂保圧手段および保圧支援手段への
溶融樹脂の圧縮限界内の少量の溶融樹脂の強制封入によ
って自然発生的に得られ、この保圧力がすべてゲートを
通じてキャビティ内に射出された溶融樹脂に無段階で作
用するのできわめて成形性の高い成形品を得ることがで
きる。ことに、従来では、キャビティ内の樹脂の可塑化
状態が、主として射出成形作用の最終段階における機械
的、電子的な多段制御による射出、保圧手段の働きが完
全に終るまでこれに続く冷却固化の操作を速やかに行え
なかったがこの発明に係る無段階の円滑かつ有効な溶融
樹脂保圧手段の働きにより従来に比し１０％〜３０％程
度の時間短縮が得られるので冷却工程が早まりこれに伴
う爾後の工程も順次早まることとなり、成形に要するサ
イクル時間短縮することができるという効果がある。In the present invention, as described above, the injection action by the injection means and the holding pressure action by the molten resin pressure holding means equipped with the pressure holding support means are controlled by the valve closing operation such as a valve opening/closing mechanism. The holding pressure effect, which is particularly essential for precision molding, is obtained spontaneously by forcibly filling a small amount of molten resin within the compression limit of the molten resin into the molten resin holding pressure means and pressure holding support means. Since all the holding force acts steplessly on the molten resin injected into the cavity through the gate, a molded product with extremely high moldability can be obtained. In particular, in the past, the plasticized state of the resin in the cavity was mainly controlled by mechanical and electronic multi-stage control in the final stage of the injection molding process, followed by cooling and solidification until the pressure holding means completed its function. However, due to the stepless, smooth and effective molten resin pressure retaining means according to the present invention, the time can be shortened by about 10% to 30% compared to the conventional method, which speeds up the cooling process. The subsequent steps associated with this process will also be accelerated, resulting in the effect that the cycle time required for molding can be shortened.
また、この発明によれば、弁開閉手段を挟んで一方の側
の溶融樹脂保圧手段では保圧作用か調圧機構で働くピス
トンによりシリンダー内の小容積内に貯溜される少量の
溶融樹脂を介してキャビティに向って自動的にしかも無
段階で能率よく働くのでキャビティ内に射出された溶融
樹脂の可塑化状態から冷却固化への時間を短縮でき、弁
開閉手段を挟んで他方の側の射出機構では、射出、保圧
の両工程に全く無関係に可塑化工程に直ちに移行でき、
しかも型締力の大きさの如何を問わず無関係とすること
ができるのでこの可塑化工程を、従来に比し長時間行え
ることとなり、樹脂の可塑化に無理がなく、大容量の原
料樹脂の可塑溶融化が可能となると共に可塑化機構の構
成も小径にして射出手段を小型化でき安価に提供できる
。Further, according to the present invention, the molten resin pressure holding means on one side of the valve opening/closing means holds a small amount of molten resin stored in a small volume in the cylinder by a pressure holding action or a piston working in a pressure regulating mechanism. Since the molten resin injected into the cavity works automatically and efficiently in a stepless manner, the time required for the molten resin injected into the cavity to go from the plasticized state to the cooling solidification can be shortened, and the injection on the other side with the valve opening/closing means in between can be reduced. The mechanism allows for immediate transition to the plasticizing process, completely unrelated to both the injection and pressure holding processes.
Moreover, since the magnitude of the mold clamping force can be made irrelevant, this plasticizing process can be carried out for a longer time than before, making it easier to plasticize the resin and using a large amount of raw material resin. Plastic melting is possible, and the configuration of the plasticizing mechanism is also made small in diameter so that the injection means can be miniaturized and provided at low cost.
さらに、この発明によれば、保圧支援手段の働きにより
、保圧作用が無段階で型開操作の瞬間まで、常に作用す
るため、複雑なキャビティの形状にも等しく追随して精
密成形できると共に、多数側堰りにもきわめて有効であ
る。Further, according to the present invention, due to the function of the pressure-holding support means, the pressure-holding action is stepless and always acts until the moment of mold opening operation, so that precision molding can be performed evenly following the complex shape of the cavity. , it is also extremely effective for multiple side weirs.
そして、所謂、−速一圧という最も簡単で単純な射出成
形操作を行わせて、従来のコンピュータ搭載による高価
な射出、保圧の多段階制御を排除できると共に保圧工程
の時間の短縮化による爾後の工程を早めることが可能と
なったことと、可塑化機構の可塑化時間を十分に取るこ
とが可能になったことにより高精度の射出成形品の画期
的なハイ・サイクル成形を実現できるという効果がある
。By performing the simplest and simplest injection molding operation, so-called -speed and one pressure, it is possible to eliminate the expensive multi-stage control of injection and holding pressure using conventional computers, and to shorten the time for the holding process. By making it possible to speed up subsequent processes and allowing sufficient plasticization time for the plasticization mechanism, we have achieved revolutionary high-cycle molding of high-precision injection molded products. There is an effect that it can be done.
第１図ないし第６図は、この発明に係る合成樹脂射出成
形方法およびその装置をランナーレス射出成形装置に施
した場合の作動工程を示す断面説明図、第７図はこの発
明に係る保圧支援手段の具体例を示す拡大断面図である
。1 to 6 are cross-sectional explanatory diagrams showing the operating steps when the synthetic resin injection molding method and device according to the present invention are applied to a runnerless injection molding device, and FIG. 7 is a pressure holding according to the present invention. FIG. 3 is an enlarged sectional view showing a specific example of the support means.
１・・・・・・射出機構 ４−−−−−−ノズル ５・・・・・・弁 １３・・・・・・キャビティ １４・・・・・・ゲート １９・・・・・・スプルーランナー部 Ｙ・・・・・・保圧支援手段 ｐ・・・・・・ピストン ｑ・・・・・・シリンダー Ｓ・・・・・・ばね機構1... Injection mechanism 4-------Nozzle 5... Valve 13...Cavity １４・・・・・・Gate 19...Sprue runner part Y・・・・・・Pressure support means p・・・Piston q・・・・・・Cylinder S...Spring mechanism
Claims (6)
料を、所望の射出手段の射出操作により予め所望の容積
を計測して与えて保圧支援機構を有する溶融樹脂保圧手
段を介して一以上のキャビティ内にゲートを経て射出成
形する都度、前記射出手段で射出される溶融樹脂の量を
、前記溶融樹脂保圧手段の容積に対応して定まる原料樹
脂の圧縮限界内の少容量を加算した値に計量して前記溶
融樹脂保圧手段内に押入して射出手段との流通を遮断し
、この溶融樹脂保圧手段内に、前記原料溶融樹脂の圧縮
限界内の少量の封入による保圧力を保有させて前記保圧
支援機構の働きにより前記キャビティ内への原料樹脂の
保圧を行うようにしたことを特徴とするランナーレス合
成樹脂射出成形方法。(1) The raw material heated and melted by the raw material resin heating and melting means is injected into a desired volume by an injection operation of a desired injection means, and is then fed to a desired volume through a molten resin pressure holding means having a pressure holding support mechanism. Each time injection molding is performed into the above cavity through the gate, the amount of molten resin injected by the injection means is added by a small volume within the compression limit of the raw resin determined corresponding to the volume of the molten resin pressure holding means. A small amount of the raw molten resin within the compression limit is sealed in the molten resin pressure means, and the holding pressure is increased by inserting the molten resin into the pressure holding means to cut off the communication with the injection means. A runnerless synthetic resin injection molding method characterized in that the material resin is held in the cavity by the function of the pressure holding support mechanism.
料を、所望の射出手段の射出操作により予め所望の容積
を計測して与えて保圧支援機構を有する溶融樹脂保圧手
段を介してスプルーランナー部より一以上のキャビティ
内にゲートを経て射出成形する都度、前記射出手段で射
出される溶融樹脂の量を、前記溶融樹脂保圧手段の容積
に対応して定まる原料樹脂の圧縮限界内の少量を加算し
た値に計量して前記溶融樹脂保圧手段内に押入して射出
手段との流通を遮断し、この溶融樹脂保圧手段内に、前
記原料溶融樹脂の圧縮限界内の少量の封入による保圧力
を保有させて前記保圧支援機構の働きにより前記スプル
ーランナー部よりキャビティ内への原料樹脂の保圧を行
うようにしたことを特徴とするコールドランナー合成樹
脂射出成形方法。(2) The raw material heated and melted by the raw resin heating and melting means is given to the desired volume by injection operation of the desired injection means, and is sprued through the molten resin pressure holding means having a pressure holding support mechanism. Each time injection molding is carried out from the runner part into one or more cavities through a gate, the amount of molten resin injected by the injection means is controlled within the compression limit of the raw resin, which is determined according to the volume of the molten resin pressure holding means. A small amount is added to the value and is pushed into the molten resin pressure holding means to cut off communication with the injection means, and a small amount within the compression limit of the raw material molten resin is sealed in the molten resin pressure holding means. 1. A cold runner synthetic resin injection molding method, characterized in that the holding pressure is maintained by the holding pressure support mechanism to hold the raw resin from the sprue runner portion into the cavity.
料を、所望の射出手段の射出操作により予め所望の容積
を計測して与えて保圧支援機構に有する溶融樹脂保圧手
段を介して一以上のキャビティ内にゲートを経て射出成
形する都度、前記射出手段で射出される溶融樹脂の量を
、前記溶融樹脂保圧手段の容積に対応して定まる原料溶
融樹脂の圧縮限界内の少量を加算した値に計量して前記
溶融樹脂保圧手段内に押入して射出手段との流通を遮断
し、この溶融樹脂保圧手段内に、前記原料溶融樹脂の圧
縮限界内の少量の封入による保圧力を保有させて前記保
圧支援機構の働きにより前記キヤビテイ内への原料樹脂
の保圧を行うと共にキャビティでの成形品取出時、溶融
樹脂保圧手段に残留する保圧力を射出手段の後退に基づ
く前記溶融樹脂保圧手段の容積増加によって消失させ、
前記成形品取出後、溶融樹脂保圧手段との流通を開放し
て射出手段を前進させて溶融樹脂保圧手段の容積を元の
容積に戻し、つぎの射出成形操作を反覆して行うように
したことを特徴とするランナーレス合成樹脂射出成形方
法。(3) The raw material heated and melted by the raw material resin heating and melting means is supplied by measuring a desired volume in advance by an injection operation of a desired injection means, and is then delivered to the molten resin through the molten resin pressure holding means included in the pressure holding support mechanism. Each time injection molding is performed into the above cavity through the gate, the amount of molten resin injected by the injection means is added by a small amount within the compression limit of the raw molten resin determined in accordance with the volume of the molten resin pressure holding means. A small amount of the raw molten resin within the compression limit is sealed in the molten resin pressure means, and the holding pressure is increased by inserting the molten resin into the pressure holding means to cut off the communication with the injection means. is held, and the pressure of the raw resin in the cavity is held by the function of the pressure holding support mechanism, and when the molded product is taken out from the cavity, the holding force remaining in the molten resin pressure holding means is adjusted based on the retraction of the injection means. Dissipate by increasing the volume of the molten resin pressure retention means,
After taking out the molded product, the communication with the molten resin pressure holding means is opened, the injection means is advanced, the volume of the molten resin pressure holding means is returned to the original volume, and the next injection molding operation is repeated. A runnerless synthetic resin injection molding method characterized by:
料を、所望の射出手段の射出操作により予め所望の容積
を計測して与え保圧支援機構を有するて溶融樹脂保圧手
段を介してスプルーランナー部より一以上のキャビティ
内にゲートを経て射出成形する都度、前記射出手段で射
出される溶融樹脂の量を、前記溶融樹脂保圧手段の容積
に対応して定まる原料溶融樹脂の圧縮限界内の少量を加
算した値に計量して前記溶融樹脂保圧手段内に押入して
射出手段との流通を遮断し、この溶融樹脂保圧手段内に
、前記原料溶融樹脂の圧縮限界内の少量の封入による保
圧力を保有させて前記保圧支援機構の働きにより前記ス
プルーランナー部よりキャビティ内への原料樹脂の保圧
を行うと共にキャビティでの成形品をスプルーランナー
を含めて取出時、溶融樹脂保圧手段に残留する保圧力を
射出手段の後退に基づく前記溶融樹脂保圧手段の容積増
加によって消失させ、前記成形品およびスプルーランナ
ー取出後、溶融樹脂保圧手段との流通を開放して射出手
段を前進させて溶融樹脂保圧手段の容積を元の容積に戻
し、つぎの射出成形操作を反覆して行うようにしたこと
を特徴とするコールドランナー合成樹脂射出成形方法。(4) The raw material heated and melted by the raw resin heating and melting means is injected into the sprue via the molten resin pressure holding means by having a pressure holding support mechanism and giving the desired volume by injection operation of the desired injection means. Each time injection molding is performed from the runner part into one or more cavities through a gate, the amount of molten resin injected by the injection means is within the compression limit of the raw molten resin determined in accordance with the volume of the molten resin pressure holding means. A small amount within the compression limit of the raw material molten resin is weighed and pushed into the molten resin pressure holding means to cut off communication with the injection means, and a small amount within the compression limit of the raw material molten resin is added to the molten resin pressure holding means. By retaining the retaining pressure due to the encapsulation, the retaining pressure support mechanism retains the pressure of the raw resin from the sprue runner into the cavity, and when the molded product including the sprue runner is taken out of the cavity, the molten resin is retained. The retaining force remaining in the pressure means is dissipated by increasing the volume of the molten resin pressure means as the injection means retreats, and after taking out the molded product and sprue runner, the communication with the molten resin pressure means is opened and the injection means is removed. A cold runner synthetic resin injection molding method characterized in that the volume of the molten resin pressure holding means is returned to the original volume by advancing the molten resin pressure means, and the next injection molding operation is repeated.
手段と、弁開閉手段と、調圧機構を備えたピストンを有
し、シリンダー容積を可変にして働く保圧支援手段を組
み込んだ保圧力を保有し得る溶融樹脂保圧手段と、一以
上のゲートとキャビティで形成される成形物金型手段と
より成り、前記弁開閉手段の弁開閉操作と、前記溶融樹
脂保圧手段の容積変化に伴う保圧力の封じ込めと解放と
の操作を射出成形操作の都度行うようにして成ることを
特徴とするランナーレス合成樹脂射出成形装置。(5) It has an injection means equipped with a plasticizing mechanism that heats and melts the raw resin, a valve opening/closing means, and a piston equipped with a pressure regulating mechanism, and has a pressure retention support means that works by varying the cylinder volume. It consists of a molten resin pressure holding means capable of retaining pressure, and a molding means formed by one or more gates and cavities, and the valve opening/closing operation of the valve opening/closing means and the volume change of the molten resin pressure holding means. A runnerless synthetic resin injection molding apparatus characterized in that the operation of sealing and releasing the holding force associated with the injection molding operation is performed each time the injection molding operation is performed.
手段と、弁開閉手段と、調圧機構を備えたピストンを有
し、シリンダー容積を可変して働く保圧支援手段を組み
込んだ保圧力を保有し得る溶融樹脂保圧手段と、一以上
のゲートとキャビティとスプルーランナー部で形成され
る成形物金型手段とより成り、前記弁開閉手段の弁開閉
操作と、前記溶融樹脂保圧手段の容積変化に伴う保圧力
の封じ込めと解放との操作を射出成形操作の都度行うよ
うにして成ることを特徴とするコールドランナー合成樹
脂射出成形装置。(6) A housing that has an injection means equipped with a plasticizing mechanism that heats and melts the raw resin, a valve opening/closing means, and a piston equipped with a pressure regulating mechanism, and incorporates a pressure holding support means that works by varying the cylinder volume. It consists of a molten resin pressure holding means capable of retaining pressure, and a molding means formed by one or more gates, cavities, and sprue runner parts, and the valve opening/closing operation of the valve opening/closing means and the molten resin pressure holding means. A cold runner synthetic resin injection molding apparatus characterized in that the operation of sealing and releasing the holding force as the volume of the means changes is performed each time during injection molding operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21305389A JPH0376618A (en) | 1989-08-21 | 1989-08-21 | Synthetic resin-injection molding process with no runner and cold runner and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21305389A JPH0376618A (en) | 1989-08-21 | 1989-08-21 | Synthetic resin-injection molding process with no runner and cold runner and its device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0376618A true JPH0376618A (en) | 1991-04-02 |
Family
ID=16632750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21305389A Pending JPH0376618A (en) | 1989-08-21 | 1989-08-21 | Synthetic resin-injection molding process with no runner and cold runner and its device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0376618A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6225028A (en) * | 1985-07-25 | 1987-02-03 | Aisin Seiki Co Ltd | Injection molding machine with dwelling device |
-
1989
- 1989-08-21 JP JP21305389A patent/JPH0376618A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6225028A (en) * | 1985-07-25 | 1987-02-03 | Aisin Seiki Co Ltd | Injection molding machine with dwelling device |
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