JP2009006524A - Preplasticization injection molding machine - Google Patents

Preplasticization injection molding machine Download PDF

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JP2009006524A
JP2009006524A JP2007168195A JP2007168195A JP2009006524A JP 2009006524 A JP2009006524 A JP 2009006524A JP 2007168195 A JP2007168195 A JP 2007168195A JP 2007168195 A JP2007168195 A JP 2007168195A JP 2009006524 A JP2009006524 A JP 2009006524A
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injection
cylinder
molten resin
mold
plasticizing
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Yutaka Maruta
豊 丸田
Toshio Sugita
寿夫 杉田
Seiichi Uemoto
誠一 上本
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a preplasticization injection molding machine which can prevent the temperature distribution of a molten resin retained in an injection cylinder from being nonuniform when a prescribed amount of the molten resin supplied from a plastication cylinder through a communicating conduit is retained in the injection cylinder to stand by. <P>SOLUTION: The preplasticization injection molding machine has a plastication part 1 equipped with the plastication cylinder 11 and a plastication screw 12, an injection part 2 which retains the molten resin 7 supplied from the plastication cylinder 11 in the injection cylinder 21 and injects/packs the retained molten resin 7 in a mold 3 by an injection plunger 22, and a mold clamping device 4 for clamping the mold 3. A pushing member 25 is arranged in an approximately central part of a cross section perpendicular to the injection cylinder 21 shaft direction of a retention space 20 for the molten resin 7 in the injection cylinder 21, and the shape in the cross section of the retention space 20 is made annular. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は可塑化スクリューにより溶融された溶融樹脂を射出シリンダに供給し、射出シリンダ内の溶融樹脂を射出プランジャにより金型に射出するプリプラ式射出成形装置に関する。   The present invention relates to a pre-plastic injection molding apparatus that supplies a molten resin melted by a plasticizing screw to an injection cylinder and injects the molten resin in the injection cylinder into a mold by an injection plunger.

従来からプリプラ式射出成形装置が知られている。プリプラ式射出成形装置は例えば図６に示すように、金型、可塑化シリンダ及び可塑化シリンダ内で回転駆動する可塑化スクリューを備えた可塑化部と、射出シリンダ及び射出シリンダ内で往復動自在の射出プランジャを備えた射出部とを備えたものである。以下、図６、図７に基づいて従来のプリプラ式射出成形装置を用いた射出成形方法の一成形サイクルを順に説明する。   Conventionally, a pre-plastic injection molding apparatus is known. For example, as shown in FIG. 6, the pre-plastic injection molding apparatus is capable of reciprocating within a mold, a plasticizing cylinder, and a plasticizing portion including a plasticizing screw that is rotationally driven in the plasticizing cylinder, and in the injection cylinder and the injection cylinder. The injection part provided with this injection plunger. Hereinafter, one molding cycle of an injection molding method using a conventional pre-plastic injection molding apparatus will be described in order based on FIG. 6 and FIG.

図６（ａ）に示すプリプラ式射出成形装置は型締め工程時の状態を示すものである。この型締め工程では、金型３を型締めすると共に、可塑化シリンダ１１から連通路２４を介して供給された所定の容量の溶融樹脂７を射出シリンダ２１内に貯留した状態で待機するものであり、この型締め工程の後に射出工程に移行する。射出工程では図６（ｂ）に示すように射出プランジャ２２を前進させ、これにより射出シリンダ２１内の溶融樹脂７を射出シリンダ２１の先端に設けた射出ノズル６を介して金型３内に射出充填する。射出プランジャ２２は、図７に示すように射出シリンダ２１内の空間の断面と略同じ円形の断面形状となっていて、射出シリンダ２１内に貯留している溶融樹脂７を漏れなく押し出す。次いで成形工程及び計量工程を同時に開始する。成形工程では図６（ｃ）に示すように金型３内に射出された溶融樹脂７の冷却硬化を開始する。またこの成形工程と同時に開始される計量工程では、図６（ｃ）（ｄ）に示すように可塑化スクリュー１２を回転し、これによりホッパー１４から供給された樹脂ペレット等の樹脂材料を可塑化スクリュー１２の回転に伴う剪断力により溶融し、また同時に可塑化シリンダ１１内の溶融樹脂７を連通路２４を介して射出シリンダ２１の先端部内へと送り出し、これにより射出プランジャ２２を後退させて、射出シリンダ２１の先端部内に所定の容積に計量された溶融樹脂７を充填する。そして上記計量工程及び成形工程が終了した後、図６（ｅ）に示すように金型３を型開きして、取り出し装置５により金型３から固化した成形品８を取り出す取り出し工程に移行し、以下上記工程からなる一成形サイクルを繰り返し実行して多数の成形品８を得る。   The pre-plastic injection molding apparatus shown in FIG. 6A shows a state during the mold clamping process. In this mold clamping step, the mold 3 is clamped, and a predetermined amount of molten resin 7 supplied from the plasticizing cylinder 11 via the communication path 24 is waited in a state where it is stored in the injection cylinder 21. Yes, after this mold clamping process, the process proceeds to the injection process. In the injection process, as shown in FIG. 6B, the injection plunger 22 is advanced, whereby the molten resin 7 in the injection cylinder 21 is injected into the mold 3 through the injection nozzle 6 provided at the tip of the injection cylinder 21. Fill. As shown in FIG. 7, the injection plunger 22 has a circular cross-sectional shape that is substantially the same as the cross-section of the space in the injection cylinder 21, and pushes out the molten resin 7 stored in the injection cylinder 21 without leakage. Next, the molding process and the metering process are started simultaneously. In the molding step, as shown in FIG. 6C, cooling and hardening of the molten resin 7 injected into the mold 3 is started. In the metering process started simultaneously with the molding process, the plasticizing screw 12 is rotated as shown in FIGS. 6C and 6D, thereby plasticizing resin materials such as resin pellets supplied from the hopper 14. The molten resin 7 in the plasticizing cylinder 11 is melted by the shearing force accompanying the rotation of the screw 12, and at the same time, the molten resin 7 in the plasticizing cylinder 11 is fed into the distal end portion of the injection cylinder 21 through the communication passage 24, thereby causing the injection plunger 22 to retreat, The tip of the injection cylinder 21 is filled with the molten resin 7 measured to a predetermined volume. Then, after the measurement process and the molding process are completed, the mold 3 is opened as shown in FIG. 6E, and the process moves to the take-out process in which the molded product 8 solidified from the mold 3 is taken out by the take-out device 5. Thereafter, one molding cycle consisting of the above steps is repeatedly executed to obtain a large number of molded products 8.

ところで上記プリプラ式射出成形装置においては、図６（ａ）に示して上述したように可塑化シリンダ１１から連通路２４を介して供給された所定の容量の溶融樹脂７を射出シリンダ２１内に貯留して待機するのであるが、この時射出シリンダ２１内で貯留される溶融樹脂７は、射出シリンダ２１の内壁面付近に位置する溶融樹脂７と射出シリンダ２１の内壁面から遠い中心部に位置する溶融樹脂７との間に大きな温度差が生じ、溶融樹脂７の温度分布が不均一となって、金型３内に射出充填する際の射出に偏りが生じたり成形品８が材質的に不均一となってしまう惧れがあった。
特開平６−１６６０７２号公報 By the way, in the above-mentioned pre-plastic injection molding apparatus, a predetermined volume of molten resin 7 supplied from the plasticizing cylinder 11 through the communication path 24 is stored in the injection cylinder 21 as shown in FIG. At this time, the molten resin 7 stored in the injection cylinder 21 is positioned in the central portion far from the inner wall surface of the injection resin 21 and the molten resin 7 positioned in the vicinity of the inner wall surface of the injection cylinder 21. A large temperature difference occurs between the molten resin 7 and the temperature distribution of the molten resin 7 becomes non-uniform, causing unevenness in injection when the mold 3 is injected and filled, and the molded product 8 is not materially suitable. There was a risk of becoming uniform.
Japanese Patent Laid-Open No. 6-166072

本発明は上記従来の問題点に鑑みて発明したものであって、その目的とするところは、可塑化シリンダから連通路を介して供給された所定の容量の溶融樹脂を射出シリンダ内に貯留して待機する際、射出シリンダ内に貯留されている溶融樹脂の温度分布が不均一となるのを抑えることができるプリプラ式射出成形装置を提供することを課題とするものである。   The present invention has been invented in view of the above-described conventional problems, and an object of the present invention is to store a predetermined volume of molten resin supplied from a plasticizing cylinder through a communication path in an injection cylinder. Therefore, it is an object of the present invention to provide a pre-plastic injection molding apparatus that can prevent the temperature distribution of the molten resin stored in the injection cylinder from becoming non-uniform.

上記課題を解決するために請求項１に係る発明は、可塑化シリンダ１１及び可塑化スクリュー１２を備えた可塑化部１と、可塑化シリンダ１１から供給された溶融樹脂７を射出シリンダ２１内に貯留すると共に該貯留している溶融樹脂７を射出プランジャ２２により金型３に射出充填する射出部２と、金型３を型締めする型締め装置４と、を備えたプリプラ式射出成形装置であって、射出シリンダ２１内の溶融樹脂７の貯留スペース２０の該射出シリンダ２１軸方向に垂直な断面の略中心部に押し退け部材２５を配設して、貯留スペース２０の前記断面における形状を環状として成ることを特徴とするものである。   In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the plasticizing part 1 including the plasticizing cylinder 11 and the plasticizing screw 12 and the molten resin 7 supplied from the plasticizing cylinder 11 are placed in the injection cylinder 21. A pre-plastic injection molding apparatus comprising: an injection unit 2 that stores and stores the molten resin 7 that is stored in the mold 3 by an injection plunger 22; and a mold clamping device 4 that clamps the mold 3. In addition, a displacement member 25 is disposed at a substantially central portion of a cross section perpendicular to the axial direction of the injection cylinder 21 in the storage space 20 of the molten resin 7 in the injection cylinder 21, and the shape of the storage space 20 in the cross section is annular. It is characterized by comprising.

このような構成とすることで、貯留スペース２０に貯留されている溶融樹脂７は射出シリンダ２１内面から一定距離（環の幅）以内に存在することとなり、溶融樹脂７の温度分布が不均一となるのを抑えることができるものである。   With such a configuration, the molten resin 7 stored in the storage space 20 exists within a certain distance (the width of the ring) from the inner surface of the injection cylinder 21, and the temperature distribution of the molten resin 7 is not uniform. Can be suppressed.

また請求項２に係る発明は、請求項１に係る発明において、押し退け部材２５を棒状に形成すると共に射出プランジャ２２を押し退け部材２５に進退自在に被嵌し、押し退け部材２５にヒーター２６を設けて成ることを特徴とするものである。   The invention according to claim 2 is the invention according to claim 1, wherein the push-out member 25 is formed in a rod shape and the injection plunger 22 is fitted to the push-out member 25 so as to be able to advance and retreat, and the heater 26 is provided in the push-out member 25. It is characterized by comprising.

このような構成とすることで、押し退け部材２５の温度が低いと、貯留スペース２０に貯留している溶融樹脂７は押し退け部材２５に接触している部分の温度が低下して温度分布が不均一となってしまうため、押し退け部材２５に設けたヒーター２６によって押し退け部材２５を溶融樹脂７と略同じ温度として温度分布が不均一となるのを抑えることができる。   By adopting such a configuration, when the temperature of the displacement member 25 is low, the temperature of the portion of the molten resin 7 stored in the storage space 20 that is in contact with the displacement member 25 is lowered and the temperature distribution is uneven. Therefore, the heater 26 provided on the push-off member 25 can suppress the push-off member 25 to be substantially the same temperature as the molten resin 7 to prevent the temperature distribution from becoming uneven.

また請求項３に係る発明は、請求項１又は２に係る発明において、射出シリンダ２１の外周に断熱材２７を設けて成ることを特徴とするものである。   The invention according to claim 3 is characterized in that in the invention according to claim 1 or 2, a heat insulating material 27 is provided on the outer periphery of the injection cylinder 21.

このような構成とすることで、射出シリンダ２１から放熱されるのを低減して、温度分布が不均一となるのをより一層抑えることが可能となる。   By adopting such a configuration, it is possible to reduce heat dissipation from the injection cylinder 21 and further suppress uneven temperature distribution.

本発明のプリプラ式射出成形装置にあっては、射出シリンダ内の貯留スペースに貯留されている溶融樹脂は射出シリンダ内面から一定距離以内に存在することとなり、溶融樹脂の温度分布が不均一となることによる、金型内に射出充填する際の射出の偏りや成形品の材質の不均一等を抑えることが可能となるものである。   In the pre-plastic injection molding apparatus of the present invention, the molten resin stored in the storage space in the injection cylinder exists within a certain distance from the inner surface of the injection cylinder, and the temperature distribution of the molten resin becomes non-uniform. Thus, it is possible to suppress unevenness of injection and non-uniformity of the material of the molded product when injection filling the mold.

以下、本発明の一実施形態について添付図面に基づいて説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

プリプラ式射出成形装置は、図１に示すように、金型３と、金型３を開閉する型締め装置４と、金型３から成形品８を取り出す取り出し装置５（図２参照）と、樹脂材料を可塑化溶融する可塑化部１と、可塑化溶融された溶融樹脂７を金型３内に射出する射出部２を備えている。   As shown in FIG. 1, the pre-plastic injection molding apparatus includes a mold 3, a mold clamping device 4 that opens and closes the mold 3, a take-out device 5 that takes out a molded product 8 from the mold 3 (see FIG. 2), A plasticizing part 1 for plasticizing and melting the resin material and an injection part 2 for injecting the plasticized and melted molten resin 7 into the mold 3 are provided.

可塑化部１は、先端側に向かって下り傾斜した姿勢で配された可塑化シリンダ１１と、可塑化シリンダ１１に内装した可塑化スクリュー１２と、可塑化スクリュー１２を回転駆動するモータからなるスクリュー駆動部１３とを備えている。可塑化シリンダ１１にはホッパー１４を設けてあり、ホッパー１４に貯えられた樹脂材料は可塑化シリンダ１１の基端側に設けた材料供給口１５を介して可塑化シリンダ１１内に供給されるようになっている。そしてスクリュー駆動部１３により可塑化スクリュー１２を軸廻りに回転駆動すると共に可塑化シリンダ１１の外周に設けた図示しないシリンダヒーター（バンドヒーター）により可塑化シリンダ１１内を加熱することで、ホッパー１４から材料供給口１５を介して可塑化シリンダ１１内に供給された樹脂材料を可塑化スクリュー１２の回転に伴う剪断力とシリンダヒーター２６の加熱により先端側に送りながら溶融できるようになっている。   The plasticizing unit 1 includes a plasticizing cylinder 11 arranged in a posture inclined downward toward the front end side, a plasticizing screw 12 provided in the plasticizing cylinder 11, and a screw that rotates the plasticizing screw 12. And a drive unit 13. The plasticizing cylinder 11 is provided with a hopper 14, and the resin material stored in the hopper 14 is supplied into the plasticizing cylinder 11 through a material supply port 15 provided on the base end side of the plasticizing cylinder 11. It has become. The plasticizing screw 12 is driven to rotate about the axis by the screw driving unit 13 and the inside of the plasticizing cylinder 11 is heated by a cylinder heater (band heater) (not shown) provided on the outer periphery of the plasticizing cylinder 11. The resin material supplied into the plasticizing cylinder 11 through the material supply port 15 can be melted while being sent to the tip side by the shearing force accompanying the rotation of the plasticizing screw 12 and the heating of the cylinder heater 26.

射出部２は、水平姿勢で可塑化シリンダ１１に対して並べて配置された射出シリンダ２１と、射出シリンダ２１に軸方向に進退自在に内装した射出プランジャ２２と、射出プランジャ２２を射出シリンダ２１の軸方向に駆動するプランジャ駆動部２３と、本発明に係る後述する押し退け部材２５とを備えている。射出シリンダ２１の先端面部には一端を可塑化シリンダ１１の先端に連通接続した連通路２４の他端を連通接続してあり、これにより射出シリンダ２１の先端部の内部は可塑化シリンダ１１の先端部の内部に連通路２４を介して連通している。また射出シリンダ２１の先端面部の連通路２４と別の箇所には射出ノズル６を設けている。   The injection unit 2 includes an injection cylinder 21 that is arranged side by side with respect to the plasticizing cylinder 11 in a horizontal posture, an injection plunger 22 that is installed in the injection cylinder 21 so as to be movable back and forth in the axial direction, and an injection plunger 22 that is an axis of the injection cylinder 21. A plunger drive unit 23 that is driven in the direction and a push-out member 25 described later according to the present invention are provided. The distal end surface portion of the injection cylinder 21 is connected to the other end of the communication passage 24 whose one end is connected to the distal end of the plasticizing cylinder 11 so that the inside of the distal end portion of the injection cylinder 21 is connected to the distal end of the plasticizing cylinder 11. It communicates with the inside of the section through a communication path 24. Further, an injection nozzle 6 is provided at a location different from the communication path 24 on the tip surface portion of the injection cylinder 21.

金型３は、型締め装置４の固定盤４１に設けた固定型３１と可動型３２とからなり、射出シリンダ２１の前方に配設され、型締め装置４により固定型３１に対して可動型３２を移動することで金型３の型締め及び型開きを行えるようになっている。   The mold 3 includes a fixed mold 31 provided on a fixed plate 41 of the mold clamping device 4 and a movable mold 32. The mold 3 is disposed in front of the injection cylinder 21 and is movable relative to the fixed mold 31 by the mold clamping device 4. By moving 32, the mold 3 can be clamped and opened.

前述の射出ノズル６の先端に設けた射出口は固定盤４１を介して金型３のキャビティに連通している。そしてプランジャ駆動部２３により射出プランジャ２２を前進することで、射出シリンダ２１の先端部内に貯留された溶融樹脂７を射出プランジャ２２の先端に設けた射出ノズル６を介して金型３内に射出充填できるようになっている。   The injection port provided at the tip of the injection nozzle 6 communicates with the cavity of the mold 3 through the stationary platen 41. Then, by advancing the injection plunger 22 by the plunger drive unit 23, the molten resin 7 stored in the tip of the injection cylinder 21 is injected and filled into the mold 3 through the injection nozzle 6 provided at the tip of the injection plunger 22. It can be done.

射出ノズル６は、図３に示すように、先端部が先端側程流路径が小さくなるように先細り状に形成されている。また、ノズル本体部には加熱手段及び冷却手段を備え、溶融樹脂７を射出ノズル６を介して金型３内に射出充填する際に射出ノズル６の温度を溶融樹脂７の温度と同じ温度となるように制御するものである。   As shown in FIG. 3, the injection nozzle 6 is formed in a tapered shape so that the diameter of the flow path becomes smaller toward the tip side. The nozzle body is provided with heating means and cooling means, and when the molten resin 7 is injected and filled into the mold 3 through the injection nozzle 6, the temperature of the injection nozzle 6 is the same as the temperature of the molten resin 7. It controls to become.

上記スクリュー駆動部１３、プランジャ駆動部２３、型締め装置４、ノズルの加熱手段及び冷却手段等は図示しない制御手段に制御され、これにより図１（ａ）〜（ｅ）に示す一連の成形サイクルを繰返して成形を行えるようになっている。   The screw drive unit 13, the plunger drive unit 23, the mold clamping device 4, the nozzle heating unit, the cooling unit, and the like are controlled by a control unit (not shown), whereby a series of molding cycles shown in FIGS. 1 (a) to 1 (e). Can be molded repeatedly.

一成形サイクルは、型締め工程と、型締め工程の後に実行される射出工程と、射出工程の後に実行される成形工程と、成形工程の後に実行される取り出し工程と、成形工程及び取り出し工程と並行して実行される計量工程とからなる。以下、各工程について詳述する。   One molding cycle includes a mold clamping process, an injection process performed after the mold clamping process, a molding process performed after the injection process, a take-out process performed after the molding process, a molding process, and a take-out process. The weighing process is performed in parallel. Hereinafter, each process is explained in full detail.

型締め工程では、図１（ａ）や図２（ａ）、（ｂ）に示すように型締め工程開始時に型締め状態にある金型３を型締め装置４により型締めすると共に、可塑化シリンダ１１から連通路２４を介して供給された溶融樹脂７を射出シリンダ２１の先端部内に充填して貯留した状態で待機する。この型締め工程においては可塑化スクリュー１２及び射出プランジャ２２は停止状態にある。   In the mold clamping process, as shown in FIGS. 1A, 2A, and 2B, the mold 3 that is in the mold clamping state at the start of the mold clamping process is clamped by the mold clamping device 4 and plasticized. It waits in the state which filled the molten resin 7 supplied via the communicating path 24 from the cylinder 11 in the front-end | tip part of the injection cylinder 21, and stored it. In this mold clamping process, the plasticizing screw 12 and the injection plunger 22 are in a stopped state.

射出工程では、射出工程開始時に後退位置にある射出プランジャ２２を図１（ｃ）に示すようにプランジャ駆動部２３により前進し、これにより図２（ｃ）に示すように射出シリンダ２１の先端部内に貯留された溶融樹脂７を射出ノズル６を介して型締め状態にある金型３内に射出充填する。この時、射出ノズル６は溶融樹脂７の温度と同じ温度を維持するように制御される。そして金型３内への溶融樹脂７の充填が完了した時点で成形工程に移行する。   In the injection process, the injection plunger 22 that is in the retracted position at the start of the injection process is advanced by the plunger drive unit 23 as shown in FIG. 1 (c), whereby the inside of the tip of the injection cylinder 21 as shown in FIG. 2 (c). The molten resin 7 stored in is injected and filled into the mold 3 in a mold-clamping state via the injection nozzle 6. At this time, the injection nozzle 6 is controlled to maintain the same temperature as that of the molten resin 7. When the filling of the molten resin 7 into the mold 3 is completed, the molding process is started.

成形工程では図１（ｃ）に示すように射出工程において金型３内に充填された溶融樹脂７を固化するまでの所定時間冷却する。そして所定時間が経過して金型３内の溶融樹脂７の冷却硬化が完了した時点で取り出し工程に移行する。   In the molding step, as shown in FIG. 1C, the molten resin 7 filled in the mold 3 in the injection step is cooled for a predetermined time until it is solidified. Then, when the predetermined time has elapsed and the cooling and hardening of the molten resin 7 in the mold 3 has been completed, the process proceeds to the removal step.

計量工程は成形工程と同時に開始されるもので、この計量工程では図１（ｃ）（ｄ）に示すようにスクリュー駆動部１３により可塑化スクリュー１２を回転駆動し、これによりホッパー１４から供給された樹脂材料を可塑化シリンダ１１に設けたシリンダヒーター２６による加熱と可塑化スクリュー１２の回転に伴う剪断力により溶融する。またこれと同時に可塑化スクリュー１２の回転により可塑化シリンダ１１内の溶融樹脂７を連通路２４を介して射出シリンダ２１の先端部内へと送り出して射出プランジャ２２を後退させ、これにより射出シリンダ２１の先端部内に所定の容積に計量された溶融樹脂７を充填して貯留する。つまり射出プランジャ２２は可塑化スクリュー１２が回転している時のみに後退するようになっている。   The metering process is started at the same time as the molding process. In this metering process, as shown in FIGS. 1C and 1D, the plasticizing screw 12 is driven to rotate by the screw drive unit 13 and supplied from the hopper 14 by this. The resin material is melted by the heating by the cylinder heater 26 provided in the plasticizing cylinder 11 and the shearing force accompanying the rotation of the plasticizing screw 12. At the same time, the rotation of the plasticizing screw 12 feeds the molten resin 7 in the plasticizing cylinder 11 into the tip of the injection cylinder 21 through the communication passage 24 to retract the injection plunger 22, thereby The molten resin 7 measured to a predetermined volume is filled in the tip portion and stored. That is, the injection plunger 22 is retracted only when the plasticizing screw 12 is rotating.

この計量工程は成形工程が終了した後、図１（ｅ）に示すように取り出し工程が開始されるまでに実行されるものであり、取り出し工程の型開きが行われる時には、スクリュー駆動部１３による可塑化スクリュー１２の回転を停止して、射出プランジャ２２の後退を停止し計量工程を終了する。   This metering process is executed after the molding process is completed and before the take-out process is started as shown in FIG. 1E. When the mold is opened in the take-out process, the screw drive unit 13 The rotation of the plasticizing screw 12 is stopped, the backward movement of the injection plunger 22 is stopped, and the metering process is finished.

取り出し工程では取り出し工程開始時に型締め状態にある金型３を型開きし、図２（ｄ）〜（ｅ）に示すように金型３が型開き状態となった後に成形品８をノックアウトピン５１により可動型３２から突き出すと共に該成形品８を取り出し装置５で取り出す。   In the take-out process, the mold 3 that is in a clamped state is opened at the start of the take-out process, and the molded product 8 is knocked out after the mold 3 is in the open state as shown in FIGS. 2 (d) to 2 (e). The molded product 8 is ejected from the movable mold 32 by 51 and taken out by the take-out device 5.

そして、本発明では、可塑化シリンダ１１から供給された所定の容量の溶融樹脂７を射出シリンダ２１内に貯留して次の射出工程で射出プランジャ２２にて射出するまで待機している間、射出シリンダ２１内に貯留している溶融樹脂７の温度を均一に維持するため、貯留スペース２０の断面形状を環状とするものである。   In the present invention, a predetermined amount of the molten resin 7 supplied from the plasticizing cylinder 11 is stored in the injection cylinder 21, and the injection is performed while waiting until the injection plunger 22 injects in the next injection process. In order to keep the temperature of the molten resin 7 stored in the cylinder 21 uniform, the cross-sectional shape of the storage space 20 is annular.

射出シリンダ２１は円筒状をしたもので、内部の円柱状の空間に溶融樹脂７を貯留するのであるが、本発明では前記円柱状の空間の中心部に押し退け部材２５を配設して、射出シリンダ２１の内側で押し退け部材２５の外側の環状の空間を貯留スペース２０としたものである。すなわち、射出シリンダ２１内の該射出シリンダ２１軸方向に垂直な断面の略中心部に、棒状（本実施形態では断面円形の棒状）をした押し退け部材２５を射出シリンダ２１の軸方向に配設することで、環状の貯留スペース２０を形成してある。   The injection cylinder 21 has a cylindrical shape and stores the molten resin 7 in an internal columnar space. In the present invention, a push-out member 25 is disposed at the center of the columnar space, and the injection cylinder 21 is injected. An annular space outside the displacement member 25 inside the cylinder 21 is defined as a storage space 20. That is, a pushing-out member 25 having a rod shape (in the present embodiment, a rod shape having a circular cross section) is disposed in the axial direction of the injection cylinder 21 at a substantially central portion of a cross section perpendicular to the axial direction of the injection cylinder 21 in the injection cylinder 21. Thus, an annular storage space 20 is formed.

押し退け部材２５は、後方（射出方向と反対方向）の端部を前後に進退自在となるように支持するか固定してあり、この押し退け部材２５の外面に環状をした射出プランジャ２２を被嵌し、プランジャ駆動部２３にて射出プランジャ２２を押し退け部材２５に対して自在に進退させる。射出プランジャ２２の射出シリンダ２１軸方向の垂直断面形状は、貯留スペース２０の断面形状と同じであり、貯留スペース２０の溶融樹脂７を漏れなく押し出すことができる。なお本実施形態では、押し退け部材２５は、前後に進退自在となるように後方の端部を駆動部（図示せず）に接続してあると共に、前方の端部に可塑化シリンダ１１の先端から射出シリンダ２１に連通接続した連通路２４を開閉する弁体２８が接続してあり、押し退け部材２５を進退させて弁体２８を開閉させている。図に示す弁体２８は、側面に前後の空間を連通する溝２９が形成してあり、弁体２８の後方に貯留している溶融樹脂７は射出プランジャ２２により前記溝２９を通って弁体２８の前方側へと押し出されて射出される。   The push-back member 25 supports or is fixed so that the rear end (the direction opposite to the injection direction) can be moved forward and backward, and an annular injection plunger 22 is fitted on the outer surface of the push-off member 25. Then, the plunger plunger 23 pushes the injection plunger 22 forward and backward with respect to the member 25. The vertical cross-sectional shape of the injection plunger 22 in the axial direction of the injection cylinder 21 is the same as the cross-sectional shape of the storage space 20, and the molten resin 7 in the storage space 20 can be pushed out without leakage. In the present embodiment, the push-out member 25 has a rear end connected to a drive unit (not shown) so as to be able to advance and retreat forward and backward, and a front end from the tip of the plasticizing cylinder 11. A valve body 28 that opens and closes a communication passage 24 that is connected to the injection cylinder 21 is connected. The valve body 28 is opened and closed by advancing and retracting the push-out member 25. The valve body 28 shown in the figure has a groove 29 communicating with the front and rear spaces on the side surface, and the molten resin 7 stored behind the valve body 28 passes through the groove 29 by the injection plunger 22 and is valve body. It is extruded to the front side of 28 and injected.

貯留スペース２０が従来のように円柱状をしている場合には、可塑化シリンダ１１から供給された所定の容量の溶融樹脂７を射出シリンダ２１内に貯留して待機している間に射出シリンダ２１から放熱されて、射出シリンダ２１の内壁面付近に位置する溶融樹脂７が射出シリンダ２１の内壁面から遠い中心部に位置する溶融樹脂７よりも温度が低くなって大きな温度差が生じ、溶融樹脂７の温度分布が不均一となってしまい、金型３内に射出充填する際の射出に偏りが生じたり成形品８の材質が不均一となってしまうものであった。そこで上記本発明のように貯留スペース２０を環状とすることで、射出シリンダ２１の内壁面から離れた部分には押し退け部材２５が位置することとなって溶融樹脂７は押し退けられていて、貯留スペース２０に貯留されている溶融樹脂７は射出シリンダ２１内面から一定距離（環の幅）以内に存在することとなり、溶融樹脂７の温度分布が不均一となることによる、金型３内に射出充填する際の射出の偏りや成形品８の材質の不均一等を抑えることが可能となるものである。また、射出シリンダ２１内面から前記一定距離以内に溶融樹脂７を存在させる場合、貯留スペース２０の断面を円形とすると半径を前記一定距離以内とする必要があるが、この場合には環状とした場合よりも貯留スペース２０の断面積が小さくなるため、環状とする方が貯留量を大きくとることができて優れている。   When the storage space 20 has a cylindrical shape as in the prior art, the injection cylinder while storing a predetermined volume of molten resin 7 supplied from the plasticizing cylinder 11 in the injection cylinder 21 and waiting. The molten resin 7 located near the inner wall surface of the injection cylinder 21 becomes lower in temperature than the molten resin 7 located in the center portion far from the inner wall surface of the injection cylinder 21 due to heat radiation from the injection cylinder 21, resulting in a large temperature difference. As a result, the temperature distribution of the resin 7 becomes non-uniform, and uneven injection occurs when the mold 3 is injected and filled, and the material of the molded product 8 becomes non-uniform. Therefore, by making the storage space 20 annular as in the present invention, the displacement member 25 is positioned in a portion away from the inner wall surface of the injection cylinder 21, and the molten resin 7 is displaced, and the storage space The molten resin 7 stored in 20 is present within a certain distance (ring width) from the inner surface of the injection cylinder 21, and the temperature distribution of the molten resin 7 becomes non-uniform, so that the mold 3 is injected and filled. It is possible to suppress unevenness in injection and unevenness of the material of the molded product 8. In addition, when the molten resin 7 is present within the predetermined distance from the inner surface of the injection cylinder 21, if the cross section of the storage space 20 is circular, the radius needs to be within the predetermined distance. Since the cross-sectional area of the storage space 20 is smaller than that of the storage space 20, the annular shape is superior in that the storage amount can be increased.

また、図５に示すように押し退け部材２５にヒーター２６を設けてもよい。射出シリンダ２１内に配設した押し退け部材２５の温度が低い場合には、貯留スペース２０に貯留している溶融樹脂７は押し退け部材２５に接触している部分の温度が低下して温度分布が不均一となってしまうため、押し退け部材２５に設けたヒーター２６によって押し退け部材２５を溶融樹脂７と略同じ温度を維持するように制御することで、このような温度分布の不均一を抑えることができる。   Further, as shown in FIG. 5, a heater 26 may be provided on the push-out member 25. When the temperature of the push-out member 25 disposed in the injection cylinder 21 is low, the temperature of the portion of the molten resin 7 stored in the storage space 20 that is in contact with the push-out member 25 is lowered and the temperature distribution is not good. Since the temperature is uniform, the heater 26 provided on the displacement member 25 is controlled so that the displacement member 25 is maintained at substantially the same temperature as that of the molten resin 7, thereby suppressing such uneven temperature distribution. .

また、射出シリンダ２１の外周に断熱材を設けてもよい。これにより、溶融樹脂７を射出シリンダ２１内に貯留して待機している間に射出シリンダ２１から放熱されるのを低減し、温度分布が不均一となるのをより一層抑えることが可能となる。   Further, a heat insulating material may be provided on the outer periphery of the injection cylinder 21. Thereby, it is possible to reduce the heat radiation from the injection cylinder 21 while the molten resin 7 is stored in the injection cylinder 21 and stand by, and to further suppress the uneven temperature distribution. .

本発明の一実施形態を示し、（ａ）〜（ｅ）は一成形サイクルを順に示す説明図である。One Embodiment of this invention is shown, (a)-(e) is explanatory drawing which shows one molding cycle in order. （ａ）〜（ｆ）は同上の金型の成形工程を順に示す説明図である。(A)-(f) is explanatory drawing which shows the shaping | molding process of the metal mold | die same as the above in order. 同上のプリプラ式射出成形装置の射出ノズル近傍の要部拡大断面図である。It is a principal part expanded sectional view of the injection nozzle vicinity of a pre-plastic injection molding apparatus same as the above. 同上の射出シリンダ、射出プランジャ及び押し退け部材の斜視図である。It is a perspective view of an injection cylinder, an injection plunger, and a pushing-out member same as the above. 同上の射出シリンダ、射出プランジャ及び押し退け部材の他例の斜視図である。It is a perspective view of other examples of an injection cylinder, an injection plunger, and a pushing-out member same as the above. 従来例を示し、（ａ）〜（ｅ）は一成形サイクルを順に示す説明図である。A prior art example is shown, (a)-(e) is explanatory drawing which shows one molding cycle in order. 同上の射出シリンダ、射出プランジャ及び押し退け部材の斜視図である。It is a perspective view of an injection cylinder, an injection plunger, and a pushing-out member same as the above.

符号の説明Explanation of symbols

１ 可塑化部
１１ 可塑化シリンダ
１２ 可塑化スクリュー
２ 射出部
２０ 貯留スペース
２１ 射出シリンダ
２２ 射出プランジャ
２５ 押し退け部材
３ 金型
４ 型締め装置
５ 取り出し装置
６ 射出ノズル
７ 溶融樹脂
８ 成形品 DESCRIPTION OF SYMBOLS 1 Plasticizing part 11 Plasticizing cylinder 12 Plasticizing screw 2 Injection part 20 Storage space 21 Injection cylinder 22 Injection plunger 25 Pushing member 3 Mold | die 4 Clamping apparatus 5 Taking out apparatus 6 Injection nozzle 7 Molten resin 8 Molded article

Claims (3)

可塑化シリンダ及び可塑化スクリューを備えた可塑化部と、可塑化シリンダから供給された溶融樹脂を射出シリンダ内に貯留すると共に該貯留している溶融樹脂を射出プランジャにより金型に射出充填する射出部と、金型を型締めする型締め装置と、を備えたプリプラ式射出成形装置であって、射出シリンダ内の溶融樹脂の貯留スペースの該射出シリンダ軸方向に垂直な断面の略中心部に押し退け部材を配設して、貯留スペースの前記断面における形状を環状として成ることを特徴とするプリプラ式射出成形装置。   Injection in which a plasticizing part having a plasticizing cylinder and a plasticizing screw, and molten resin supplied from the plasticizing cylinder are stored in the injection cylinder and the stored molten resin is injected and filled into a mold by an injection plunger. And a mold-clamping device for clamping a mold, and a pre-plastic injection molding device having a molten resin storage space in an injection cylinder at a substantially central portion of a cross section perpendicular to the injection cylinder axial direction. A pre-plastic injection molding apparatus characterized in that a push-out member is provided and the shape of the storage space in the cross section is annular. 押し退け部材を棒状に形成すると共に射出プランジャを押し退け部材に進退自在に被嵌し、押し退け部材にヒーターを設けて成ることを特徴とする請求項１記載のプリプラ式射出成形装置。   2. The pre-plastic injection molding apparatus according to claim 1, wherein the push-out member is formed in a rod shape, the injection plunger is fitted into the push-out member so as to be movable forward and backward, and a heater is provided in the push-out member. 射出シリンダの外周に断熱材を設けて成ることを特徴とする請求項１又は２記載のプリプラ式射出成形装置。   3. A pre-plastic injection molding apparatus according to claim 1, wherein a heat insulating material is provided on the outer periphery of the injection cylinder.
JP2007168195A 2007-06-26 2007-06-26 Preplasticization injection molding machine Pending JP2009006524A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216720A (en) * 1987-03-04 1988-09-09 Masaaki Uchida Extrusion and pressing-in molding method for synthetic resin
JPH05285626A (en) * 1992-04-13 1993-11-02 Honda Motor Co Ltd Metal injection molding device
JPH09141710A (en) * 1995-11-17 1997-06-03 Murata Mfg Co Ltd Kneading device of injection molding machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216720A (en) * 1987-03-04 1988-09-09 Masaaki Uchida Extrusion and pressing-in molding method for synthetic resin
JPH05285626A (en) * 1992-04-13 1993-11-02 Honda Motor Co Ltd Metal injection molding device
JPH09141710A (en) * 1995-11-17 1997-06-03 Murata Mfg Co Ltd Kneading device of injection molding machine

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