JPH0645161B2 - Pre-plastic injection molding machine - Google Patents
Pre-plastic injection molding machineInfo
- Publication number
- JPH0645161B2 JPH0645161B2 JP27192790A JP27192790A JPH0645161B2 JP H0645161 B2 JPH0645161 B2 JP H0645161B2 JP 27192790 A JP27192790 A JP 27192790A JP 27192790 A JP27192790 A JP 27192790A JP H0645161 B2 JPH0645161 B2 JP H0645161B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- injection chamber
- tip
- flow path
- injection
- 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.)
- Expired - Fee Related
Links
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
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 《産業上の利用分野》 この発明は、可塑化室と射出室とを各独立させて設けた
いわゆるプリプラ式射出成形機に関するもので、射出室
における材料流路の開口構造およびプランジャの先端形
状に特徴がある射出成形機に関するものである。TECHNICAL FIELD The present invention relates to a so-called pre-plastic injection molding machine in which a plasticizing chamber and an injection chamber are provided independently of each other, and an opening of a material flow path in the injection chamber. The present invention relates to an injection molding machine characterized by a structure and a tip shape of a plunger.
《従来の技術》 スクリュなどの可塑化装置を備えた可塑化室とプランジ
ャを備えた射出室とを独立に設けたプリプラ式射出成形
機は、可塑化室と射出室の温度条件等を各独立に制御で
きること、可塑化スクリュと射出プランジャとの径を各
独立に選定可能であること、射出時にプランジャとバレ
ルとの間に生じるバックフローが少なく材料の射出量を
正確に制御できることおよび電圧での射出が可能である
などの特徴を有しているが、可塑化室と射出室との間に
材料の流路（以下「連結流路」という。）を設ける必要
がある。<Prior art> The pre-plastic injection molding machine, which has a plasticizing chamber equipped with a plasticizing device such as a screw and an injection chamber equipped with a plunger, is independent of the temperature conditions of the plasticizing chamber and the injection chamber. Can be controlled independently, the diameters of the plasticizing screw and the injection plunger can be selected independently, the backflow between the plunger and barrel during injection is small, and the injection amount of the material can be accurately controlled and the voltage Although it has a feature that it can be injected, it is necessary to provide a material flow path (hereinafter referred to as “connection flow path”) between the plasticizing chamber and the injection chamber.
この連結流路の可塑化室側は、可塑化室の先端に開口し
ているが、射出室６には先端にノズル流路１３が開口し
ているので、連結流路７の射出室側の開口をどこに設け
るかが問題になる。第５図ないし第９図はその従来構造
を示したもので、第５図のものは連結流路７の射出室６
の先端側面に設けたものであり、最も一般的な構造であ
る。The plasticizing chamber side of this connecting channel is opened at the tip of the plasticizing chamber, but the nozzle channel 13 is opened at the tip of the injection chamber 6, so that the connecting channel 7 on the injection chamber side is opened. The problem is where to provide the opening. FIGS. 5 to 9 show the conventional structure, and FIG. 5 shows the injection chamber 6 of the connection channel 7.
It is provided on the tip side surface of the and is the most general structure.
第６図のものは連結流路７をノズル流路１３に合流させ
て設けたもので、その合流点に切換弁４１が設けられて
いる。この切換弁４１は図示状態で連結流路７と射出室
６とを連通しており、右回りに９０度回動してノズル流
路１３を連通させる。第７図に示すものは連結流路７を
射出室６の先端の凹円錐面に斜めに開口させたもので、
連結流路７には樹脂の逆流を防止するチェックバルブ
（図示せず）を設けている。このチェックバルブや第６
図の切換弁４１は、射出室６から溶融樹脂を高圧で押し
出すさいに連結流路７を通って可塑化室へ樹脂が逆流す
るのを防止するもので、プランジャ５から加わる溶融樹
脂の押圧力を金型内に充分に伝えることができるように
している。上記第６図および第７図に示したものの例
は、例えば特開昭６１−１８５４２７号公報に開示され
ている。In FIG. 6, the connection flow path 7 is provided so as to join the nozzle flow path 13, and a switching valve 41 is provided at the joining point. The switching valve 41 connects the connection flow path 7 and the injection chamber 6 in the illustrated state, and rotates 90 degrees clockwise to connect the nozzle flow path 13. The one shown in FIG. 7 is one in which the connection flow path 7 is opened obliquely on the concave conical surface at the tip of the injection chamber 6,
The connection channel 7 is provided with a check valve (not shown) for preventing resin backflow. This check valve and the sixth
The switching valve 41 shown in the figure prevents the resin from flowing back to the plasticizing chamber through the connecting channel 7 when the molten resin is pushed out from the injection chamber 6 at high pressure. Is made to be able to be fully transmitted to the mold. Examples of those shown in FIGS. 6 and 7 are disclosed, for example, in JP-A-61-185427.
図６や図７の構造において、連結流路７に切換弁４１や
チェックバルブを設けると、その切換弁４１やチェック
バルブで樹脂が滞留するという欠点もあったため、この
発明の出願人は、特願平１−２３６６４７号で提案した
ように、スクリュの前進によって連結流路７を閉鎖する
ようにして、切換弁４１やチェックバルブを設けないプ
リプラ式射出成形機を提唱している。In the structure of FIGS. 6 and 7, when the switching valve 41 and the check valve are provided in the connection flow path 7, there is a drawback that the resin stays at the switching valve 41 and the check valve. As proposed in Japanese Patent Application No. 1-236647, a pre-plastic injection molding machine is proposed in which the connecting passage 7 is closed by advancing the screw and the switching valve 41 and the check valve are not provided.
第８図に示す構造は特開昭５９−８１１４４号公報で提
唱されているもので、プランジャ５の先端にプランジャ
の最大ストロークよりも長い小径部４２を設け、連結流
路７をこの小径部４２が位置するバレルの周面部分に設
けている。小径部の先端には逆止リング４３が装着され
ており、連結流路７から送り込まれた材料は、逆止リン
グ４３を図の左方へ移動させて小径部４２との間の隙間
を通って射出室６へと流入する。一方射出動作が行われ
るときには、プランジャ５が左動して射出室６内の圧力
が高まるため、逆止リング４３は図で右方で相対的に移
動し、射出室６内の樹脂が小径部４２の周囲の隙間４４
に逆流するのが防止される。The structure shown in FIG. 8 is proposed in Japanese Patent Laid-Open No. 59-81144, and a small diameter portion 42 longer than the maximum stroke of the plunger is provided at the tip of the plunger 5, and the connecting flow path 7 is provided with this small diameter portion 42. Is provided on the peripheral surface of the barrel where is located. A check ring 43 is attached to the tip of the small diameter portion, and the material fed from the connection flow path 7 moves the check ring 43 to the left in the drawing and passes through the gap between the small diameter portion 42. And flows into the injection chamber 6. On the other hand, when the injection operation is performed, the plunger 5 moves to the left and the pressure in the injection chamber 6 increases, so that the check ring 43 relatively moves to the right in the figure, and the resin in the injection chamber 6 has a small diameter portion. A gap 44 around 42
Backflow is prevented.
また第９図に示すものは、バレルの周壁に設けた連結流
路７が、プランジャ５が最大ストロークで後退したとき
に初めて開口するようにしたもので、プランジャ５が射
出動作に入ると、前進するプランジャ５によって連結流
路７が閉鎖される構造である。この第８図に示すものと
第９図に示すものの特徴は、射出時の終期に生ずる高い
射出圧が連結流路７の開口部分に作用しないということ
である。Further, as shown in FIG. 9, the connecting flow path 7 provided on the peripheral wall of the barrel is opened only when the plunger 5 retracts at the maximum stroke. The connecting flow path 7 is closed by the plunger 5. The feature of the one shown in FIG. 8 and the one shown in FIG. 9 is that the high injection pressure generated at the end of injection does not act on the opening portion of the connection flow path 7.
《発明が解決しようとする問題点》 成形品の形状の複雑化と肉厚の薄肉化に伴い、射出成形
機により高い射出圧が要求されるようになってきてい
る。また難撚性プラスチックスやエンジニアリングプラ
スチックス、スーパエンプラのような材料を成形したい
という要求がますます増えてきており、これらの要求に
応えるためには、従来装置よりも高い射出圧が得られ、
かつ射出室内での材料の滞留が生じない射出装置が要求
される。<< Problems to be Solved by the Invention >> As the shape of a molded product becomes more complicated and the thickness becomes thinner, a high injection pressure is required by an injection molding machine. In addition, there is an increasing demand for molding materials such as difficult-to-twist plastics, engineering plastics, and super engineering plastics.To meet these demands, a higher injection pressure than conventional equipment can be obtained.
In addition, an injection device that does not cause the material to stay in the injection chamber is required.
ところが、第５図および第６図に示す構造の従来装置
は、射出圧を高くしたいという要求に応えることができ
ない。周知のように材料力学でいう厚肉円筒では、円筒
内径部の周方向応力が最大となり、この応力はバレルの
肉厚を厚くしてもあまり低下させることができない。そ
して第５図および第６図の構造のものでは、連結流路７
の開口部分に射出室６（またはノズル流路１３）側と連
結流路７側とから内圧が作用し、しかも円孔切欠による
応力集中が生ずるため、図のＸ部分に極めて高い引張応
力が生じ、材料の疲労限度を超えてしまう。However, the conventional device having the structure shown in FIGS. 5 and 6 cannot meet the demand for increasing the injection pressure. As is well known, in a thick-walled cylinder in terms of material mechanics, the circumferential stress in the inner diameter portion of the cylinder is maximum, and this stress cannot be reduced so much even if the wall thickness of the barrel is increased. In the structure shown in FIGS. 5 and 6, the connecting channel 7
Since the internal pressure acts on the opening portion of the injection chamber 6 (or the nozzle flow path 13) side and the connection flow path 7 side and stress concentration occurs due to the circular hole notch, an extremely high tensile stress is generated in the X portion of the drawing. , The material fatigue limit is exceeded.
また第７図のものは、連結流路７が凹円錐面に開孔して
いるので、バレルの周方向応力は小さいが、連結流路の
断面積が比較的大きいため、連結流路７とノズル流路１
３との間の部分Ｙの肉厚が小さくなり、隣合う流路周壁
同志の応力が重なり合ってこの部分の応力は決して小さ
いとはいえない。また連結流路７が射出室６の中心に対
して非対称に開口しているため、射出室の反対側の隅の
部分Ｚに材料が滞留しやすいという問題もある。Further, in the case of FIG. 7, since the connecting flow path 7 is opened in the concave conical surface, the stress in the circumferential direction of the barrel is small, but since the cross-sectional area of the connecting flow path is relatively large, Nozzle flow path 1
The thickness of the portion Y between 3 and 3 becomes small, and the stresses of the adjacent flow path peripheral walls overlap each other, so the stress in this portion cannot be said to be small at all. Further, since the connection flow path 7 is opened asymmetrically with respect to the center of the injection chamber 6, there is a problem that the material is likely to stay in the corner portion Z on the opposite side of the injection chamber.
一方、第８図および第９図のものは、前述したように連
結流路７の開口部分の応力の問題は解決されるが、第８
図のものは連結流路７の反対側の隙間Ｕの部分に材料が
長時間滞留する傾向があり、また第９図のものでは、小
さい成形品を射出する場合に、プランジャ５が射出室の
先端にまでストロークしないこととなり、このとき材料
が図の矢印のように流れるため、射出室６の先端外周部
分Ｖに材料が滞留しやすいという欠点がある。On the other hand, in the case of FIGS. 8 and 9, the problem of stress in the opening portion of the connection channel 7 is solved as described above,
In the case of the drawing, the material tends to stay in the gap U on the opposite side of the connection flow path 7 for a long time, and in the case of FIG. 9, when the small molded product is injected, the plunger 5 serves as an injection chamber. Since the material does not stroke to the tip, and at this time the material flows as shown by the arrow in the figure, there is a drawback that the material tends to stay in the tip outer peripheral portion V of the injection chamber 6.
この発明は、上記問題点に鑑みてなされたもので、射出
圧をより高くすることができ、かつ射出室内での材料の
滞留をより減少させることができる構造の射出成形機を
得ることを課題としている。The present invention has been made in view of the above problems, and it is an object of the present invention to obtain an injection molding machine having a structure capable of further increasing the injection pressure and further reducing the retention of the material in the injection chamber. I am trying.
《課題を解決するための手段》 この発明では、可塑化室３と射出室６とを連結する連結
流路７の射出室６側の開口８を射出室６の先端中央部に
設け、複数本に分岐したノズル流路１３をこの連結流路
７の開口８を中心とする円周上に配置することにより、
上記課題を解決している。<< Means for Solving the Problem >> In the present invention, the opening 8 on the injection chamber 6 side of the connection flow path 7 that connects the plasticizing chamber 3 and the injection chamber 6 is provided in the center of the tip of the injection chamber 6, and a plurality of openings are provided. By arranging the nozzle flow path 13 branched into the circumference on the circumference centered on the opening 8 of the connection flow path 7,
The above problems are solved.
１個の射出室６に対して１個のノズルが設けられる通常
構造の射出成形機では、分岐された複数のノズル流路１
３は、射出室６の延長線上で合流し、ノズル１１の先端
に開口する。連結流路７はノズル流路１３の合流点２３
より射出室に近い位置７ａでノズル１１の中心から外れ
る方向に屈曲し、可塑化室３に連結される。In an injection molding machine having a normal structure in which one nozzle is provided for one injection chamber 6, a plurality of branched nozzle channels 1
3 merge on the extension line of the injection chamber 6 and open at the tip of the nozzle 11. The connection channel 7 is a confluence 23 of the nozzle channel 13.
At a position 7a closer to the injection chamber, it bends in a direction away from the center of the nozzle 11 and is connected to the plasticizing chamber 3.
分岐された複数のノズル流路１３は、射出室６の外周に
接して開口させるのがよい。更に好ましくは、射出室６
の先端にノズル流路１３の開口を繋ぐ円周溝１５を設
け、プランジャ５の先端を射出室６の先端形状に合わせ
て浅い円錐状とするとともにその外周部に上記円周溝１
５に入り込む鍔２２を設ける構造とする。It is preferable that the plurality of branched nozzle channels 13 are opened in contact with the outer circumference of the injection chamber 6. More preferably, the injection chamber 6
A circumferential groove 15 that connects the opening of the nozzle flow path 13 is provided at the tip of the plunger 5, and the tip of the plunger 5 is formed into a shallow conical shape according to the shape of the tip of the injection chamber 6, and the circumferential groove 1 is formed on the outer peripheral portion thereof.
The structure is such that a brim 22 that enters the 5 is provided.
ノズル１１にシャットオフバルブを設けるときには、連
結流路７の屈曲部７ａとノズル流路の合流点２３との間
にノズル１１の一方の側面に開口する凹所２４を穿設
し、ノズル１１の中心に沿って延在するニードル２６の
基端をこの凹所に突出させ、この凹所に先端を挿入した
レバー３１を揺動させてニードル２６でノズル流路を開
閉する構造を採用することができる。このようなシャッ
トオフバルブの構造は、それ自体は公知であるが、従来
は射出室の先端に開口させたノズル流路を途中で分岐し
てその間に凹所２４を設けていたが、上記のこの発明の
構造では、ノズル流路が元々分岐された構造で射出室６
に開口しているので、上記構造のシャットオフバルブと
の組み合わせがより合理的である。When the shutoff valve is provided in the nozzle 11, a recess 24 that opens to one side surface of the nozzle 11 is formed between the bent portion 7 a of the connection flow passage 7 and the confluence 23 of the nozzle flow passage, and A structure may be adopted in which the base end of the needle 26 extending along the center is projected into this recess, and the lever 31 having the tip inserted into this recess is swung to open and close the nozzle flow path with the needle 26. it can. Although the structure of such a shut-off valve is known per se, conventionally, the nozzle flow path opened at the tip of the injection chamber was branched midway and the recess 24 was provided between them. In the structure of this invention, the injection chamber 6 has a structure in which the nozzle flow path is originally branched.
Since it is opened to the above, the combination with the shut-off valve having the above structure is more rational.
《作用》 この発明の構造によれば、射出室６やノズル流路１３の
周壁に開口部が存在しないので、応力集中を考える必要
がなく、バレル１０やノズル１１を高い射出圧に耐える
ものとすることができる。またノズル流路１３は複数本
に分岐しておりかつ連結流路７より小径にできるので、
ノズル流路と連結流路の間の部分Ｙの肉厚も充分に厚く
することができ、この部分での応力の重なり合いも生じ
ない。また連結流路７から射出室６に流入した材料は、
中心に対して対称に配置されたノズル流路１３へと流入
していくので、射出室６内にいかなる滞留部分も生じる
ことがない。<< Operation >> According to the structure of the present invention, since the injection chamber 6 and the peripheral wall of the nozzle flow path 13 have no openings, stress concentration need not be considered and the barrel 10 and the nozzle 11 can withstand a high injection pressure. can do. Further, since the nozzle flow path 13 is branched into a plurality of lines and can have a smaller diameter than the connection flow path 7,
The thickness of the portion Y between the nozzle flow passage and the connection flow passage can be made sufficiently thick, and stress does not overlap at this portion. Further, the material that has flowed into the injection chamber 6 from the connection channel 7 is
Since it flows into the nozzle flow path 13 which is arranged symmetrically with respect to the center, any retention portion does not occur in the injection chamber 6.
ノズル流路１３を射出室６の外周に接して開口させ、射
出室６の先端にその開口を繋ぐ円周溝１５を設け、プラ
ンジャ５の先端にこの円周溝１５に入り込む鍔２２を設
けたときは、プランジャ５が前進端に達したときに射出
室６内に残留する材料を非常に少なくできる。The nozzle channel 13 was opened in contact with the outer circumference of the injection chamber 6, a circumferential groove 15 was provided at the tip of the injection chamber 6 to connect the opening, and a flange 22 was provided at the tip of the plunger 5 to enter the circumferential groove 15. At this time, the material remaining in the injection chamber 6 when the plunger 5 reaches the forward end can be extremely reduced.
また、この構造の場合には、連結流路７から射出室６内
に流入する材料を円周方向外側へと円滑に導くことがで
きるので、材料替えのときに、プランジャ５をその前進
端に保持した状態でスクリュ２を回転させることによ
り、射出室６内に残った前の材料を速やかに排除するこ
とが可能である。Further, in the case of this structure, the material flowing into the injection chamber 6 from the connection flow path 7 can be smoothly guided to the outside in the circumferential direction, so that the plunger 5 can be moved to its forward end when changing the material. By rotating the screw 2 in the held state, it is possible to quickly remove the previous material remaining in the injection chamber 6.
《実施例》 第１図ないし第３図はこの発明の第１実施例を示すもの
で、１はスクリュ２を内蔵した可塑化ユニット、３は可
塑化室、４はプランジャ５を内蔵した射出ユニット、６
は射出室、７は射出室６の先端中央から可塑化室の先端
中央へ連結された連結流路、８は連結流路７の射出室側
開口、９はスクリュバレル、１０はプランジャバレル、
１１はノズルで、ノズル１１はプランジャバレル１０の
先端にボルト１２で締結されたノズル基部１１ａと、ノ
ズル基部１１ａにネジ１１ｃで固定されたノズル先端部
１１ｂとで構成され、スクリュバレル９はノズル基部１
１ａの側面に図示しないボルトで締結して固定されてい
る。<Embodiment> FIGS. 1 to 3 show a first embodiment of the present invention, in which 1 is a plasticizing unit containing a screw 2, 3 is a plasticizing chamber, and 4 is an injection unit containing a plunger 5. , 6
Is an injection chamber, 7 is a connection channel connected from the center of the tip of the injection chamber 6 to the center of the tip of the plasticizing chamber, 8 is an opening of the connection channel 7 on the injection chamber side, 9 is a screw barrel, 10 is a plunger barrel,
Reference numeral 11 denotes a nozzle, and the nozzle 11 is composed of a nozzle base portion 11a fastened to the tip of the plunger barrel 10 with a bolt 12 and a nozzle tip portion 11b fixed to the nozzle base portion 11a with a screw 11c. The screw barrel 9 has a nozzle base portion. 1
It is fastened and fixed to the side surface of 1a by a bolt (not shown).
ノズル基部１１ａには、射出室６の先端の連結通路の開
口８を中心とした円周上に対称に開口する平行な複数本
のノズル流路１３が穿設されている。ノズル流路１３が
開口する部分のノズル基部１１ａの両端面には、円周方
向の円周溝１４、１５が設けられており、ノズル先端部
１１ｂには先端側の円周溝１４に連なる円錐凹所１６と
この円錐凹所の頂部からノズル先端に開口するノズル孔
１７とが設けられている。The nozzle base 11a is provided with a plurality of parallel nozzle channels 13 that are symmetrically opened on a circumference centered on the opening 8 of the connection passage at the tip of the injection chamber 6. Circumferential circumferential grooves 14 and 15 are provided on both end surfaces of the nozzle base portion 11a where the nozzle flow path 13 opens, and the nozzle tip end portion 11b has a conical shape connected to the tip end circumferential groove 14. A recess 16 and a nozzle hole 17 opening from the top of this conical recess to the tip of the nozzle are provided.
ノズル基部の先端側の円周溝１４の内側には、円錐凸部
１８が形成されており、ノズル先端部１１ｂをノズル基
部１１ａに装着したとき、複数のノズル流路１３の出口
から円周溝１４を経て、円錐凹所１６と円錐凸部１８の
隙間を通ってノズル孔１７に導かれる滑らかな流路が形
成される。一方射出時には、射出室６内の材料がノズル
基部１１ａの射出室側の円周溝１５によって導かれて分
岐されたノズル流路１３に滑らかに案内される。図のも
のでは、ノズル流路１３は、第２図に示すように、射出
室６の外周に接して開口するように対称に４個設けられ
ており、連結流路７は２本のノズル流路の間を通って可
塑化室３に導かれている。A conical convex portion 18 is formed inside the circumferential groove 14 on the tip end side of the nozzle base, and when the nozzle tip 11b is mounted on the nozzle base 11a, the circular groove extends from the outlets of the plurality of nozzle flow paths 13. A smooth flow path, which is guided to the nozzle hole 17 through the gap between the conical concave portion 16 and the conical convex portion 18 via 14 is formed. On the other hand, at the time of injection, the material in the injection chamber 6 is smoothly guided to the branched nozzle flow path 13 by being guided by the circumferential groove 15 on the injection chamber side of the nozzle base 11a. As shown in FIG. 2, four nozzle flow paths 13 are symmetrically provided so as to be in contact with the outer periphery of the injection chamber 6 and open, and the connection flow path 7 has two nozzle flow paths. It is led to the plasticizing chamber 3 through the path.
第４図はこの発明の第２実施例を示したもので、プラン
ジャ５の先端を射出室６の先端形状に合わせた形状と
し、ノズル１１にニードル式のシャットオフバルブ２１
を設けたものである。プランジャ５の先端は、射出室の
先端形状に合わせて浅い円錐状とするとともに、その外
周部に円周溝１５に入り込む鍔２２を設け、プランジャ
５が前進端に達したときに、射出室６内に残留する材料
をできるだけ少なくする形状としている。同時にプラン
ジャ先端をこのような形状にすることにより、連結流路
７から射出室６内に流入する材料を円周方向外側へと円
滑に導くことができ、前回の射出時に射出室内に残った
材料を次の射出時に速やかにノズル流路１３に流入させ
るように導くことができる。FIG. 4 shows a second embodiment of the present invention in which the tip of the plunger 5 is shaped to match the tip of the injection chamber 6, and the nozzle 11 has a needle-type shutoff valve 21.
Is provided. The tip of the plunger 5 is formed into a shallow conical shape according to the shape of the tip of the injection chamber, and a flange 22 that fits into the circumferential groove 15 is provided on the outer peripheral portion of the plunger 5, and when the plunger 5 reaches the forward end, the injection chamber 6 The shape is such that the material remaining inside is as small as possible. At the same time, by making the tip of the plunger into such a shape, the material flowing into the injection chamber 6 from the connection flow path 7 can be smoothly guided to the outside in the circumferential direction, and the material remaining in the injection chamber at the time of the previous injection. Can be promptly introduced into the nozzle flow path 13 at the time of the next injection.
シャットオブバルブ２１は、公知の構造なので簡単に説
明する。連結流路７の屈曲部７ａと複数のノズル流路１
３の合流点２３との間に２本のノズル流路の間を通って
側面に開口し、奥端がノズルの中心線に達する矩形の凹
所２４を設け、ノズル基部１１ａには先端側からこの凹
所２４に連通する支持孔２５を設けて、この支持孔にニ
ードル２６の基端を挿通して凹所２４に突出させるとと
もに、ニードル２６の先端をノズル孔１７の開口部に設
けた弁座２７に臨ませる。ニードル２６の中央部には、
ノズル流路１３からの材料を淀みなくノズル孔１７に導
くように、円錐状の膨出部２８を設けるとともに、凹所
２４の突出部分に直角方向の溝孔２９を設け、この溝孔
にピン３０でノズル基部１１ａに枢支されたシーソーレ
バー３１の先端を嵌挿する。シーソーレバー３１の基端
は、シリンダロッドなどの往復駆動杆３２にピン３３で
連結し、この往復駆動杆３２を進退させることにより、
ノズル孔１７を開閉する。The shut-off valve 21 has a well-known structure, and will be briefly described. Bent portion 7a of connection channel 7 and a plurality of nozzle channels 1
A rectangular recess 24 that opens between the two nozzle channels and the side face between the confluence point 23 and the converging point 23 and reaches the center line of the nozzle is provided at the nozzle base 11a from the tip side. A valve provided with a support hole 25 communicating with the recess 24 and inserting the base end of the needle 26 into the support hole so as to project into the recess 24 and the tip of the needle 26 at the opening of the nozzle hole 17 Face the seat 27. At the center of the needle 26,
In order to guide the material from the nozzle flow path 13 to the nozzle hole 17 without stagnation, a conical bulge portion 28 is provided, and a groove hole 29 in the direction perpendicular to the protruding portion of the recess 24 is provided. At 30 the tip of a seesaw lever 31 pivotally supported on the nozzle base 11 a is inserted. The base end of the seesaw lever 31 is connected to a reciprocating drive rod 32 such as a cylinder rod by a pin 33, and the reciprocating drive rod 32 is advanced and retracted,
The nozzle hole 17 is opened and closed.
また、射出時の射出室６から可塑化室３への材料の逆流
は、可塑化スクリュ２を進出させてその先端で連結流路
７の可塑化室側開口を閉鎖する構造とするのが良い。Further, the backflow of the material from the injection chamber 6 to the plasticizing chamber 3 at the time of injection is preferably structured such that the plasticizing screw 2 is advanced and the plasticizing chamber 2 opening of the connecting flow path 7 is closed at its tip. .
以上のようなニードルを用いたノズル孔の開閉構造やス
クリュ先端による連結流路の開閉構造は、ロータリ弁や
逆止弁を設けた構造と比べて材料の流路を滑らかにで
き、材料の滞留を防止するうえで極めて好適である。The opening / closing structure of the nozzle hole using the needle and the opening / closing structure of the connecting flow path by the screw tip as described above can make the flow path of the material smoother than the structure with the rotary valve or the check valve, and the retention of the material. It is extremely suitable for preventing
《発明の効果》 以上説明したこの発明によれば、射出室やノズル流路の
周壁に応力集中を生じさせないで高い射出圧を実現する
という要求と、可塑化室から射出室を経てノズル孔先端
に至る樹脂流路を短くし均一にし、かつ材料の滞留を生
じさせないという要求をともに満たすことができ、高圧
射出を要求させる製品の成形や熱によって変質しやすい
材料の成形に特に好適な射出成形機を得ることができ
る。<Effects of the Invention> According to the invention described above, it is required to realize a high injection pressure without causing stress concentration on the peripheral wall of the injection chamber and the nozzle flow path, and the nozzle hole tip from the plasticizing chamber through the injection chamber. Injection molding that is particularly suitable for molding products that require high-pressure injection and molding materials that are easily deteriorated by heat, because it can meet the requirements of shortening and uniformizing the resin flow path leading to You can get the opportunity.
第１図ないし第３図はこの発明の第１実施例を示す図
で、第１図は可塑化ユニットの先端部とともに示す断面
平面図、第２図は第１図のＡ部断面図、第３図は第２図
のＢ部断面図である。第４図はこの発明の第２実施例を
示す断面側面図である。第５図ないし第９図は射出室へ
の連結流路の開口部の従来構造を示す断面図である。 図中、 ２：スクリュ、３：可塑化室 ５：プランジャ、６：射出室 ７：連結流路、８：開口 11：ノズル、13：ノズル流路 15：円周溝、22：鍔1 to 3 are views showing a first embodiment of the present invention. FIG. 1 is a sectional plan view showing the tip of a plasticizing unit, and FIG. 2 is a sectional view of part A in FIG. FIG. 3 is a sectional view of a B part in FIG. FIG. 4 is a sectional side view showing a second embodiment of the present invention. 5 to 9 are cross-sectional views showing a conventional structure of the opening of the connection flow path to the injection chamber. In the figure, 2: screw, 3: plasticizing chamber, 5: plunger, 6: injection chamber, 7: connecting channel, 8: opening, 11: nozzle, 13: nozzle channel, 15: circumferential groove, 22: collar.
Claims (2)
流路(7)の射出室(6)側の開口(8)を射出室(6)の先端中央
部に設け、複数本に分岐したノズル流路(13)をこの連結
流路(7)の開口(8)を中心とする円周上に配置したことを
特徴とする、プリプラ式射出成形機。1. An opening (8) on a side of the injection chamber (6) of a connection channel (7) for connecting the plasticizing chamber (3) and the injection chamber (6) is provided at a central portion of a tip of the injection chamber (6). A pre-plastic injection molding machine characterized in that a nozzle flow path (13) provided and branched into a plurality of lines is arranged on a circumference centered on the opening (8) of the connection flow path (7).
(6)の外周に接して開口させ、その開口を繋ぐ円周溝(1
5)を射出室(6)の先端に設け、プランジャ(5)の先端を射
出室(6)の先端形状に合わせて浅い円錐状とするととも
にその外周部に上記円周溝(15)に入り込む鍔(22)を設け
た、請求項１記載のプリプラ式射出成形機。2. A plurality of branched nozzle channels (13) are provided in an injection chamber.
Open in contact with the outer circumference of (6), and connect the openings with the circumferential groove (1
5) is provided at the tip of the injection chamber (6), the tip of the plunger (5) is made into a shallow conical shape according to the shape of the tip of the injection chamber (6), and the circumferential groove (15) is inserted into the outer peripheral portion thereof. The pre-plastic injection molding machine according to claim 1, further comprising a collar (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27192790A JPH0645161B2 (en) | 1990-10-09 | 1990-10-09 | Pre-plastic injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27192790A JPH0645161B2 (en) | 1990-10-09 | 1990-10-09 | Pre-plastic injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04147819A JPH04147819A (en) | 1992-05-21 |
| JPH0645161B2 true JPH0645161B2 (en) | 1994-06-15 |
Family
ID=17506800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27192790A Expired - Fee Related JPH0645161B2 (en) | 1990-10-09 | 1990-10-09 | Pre-plastic injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645161B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2615334B2 (en) * | 1992-02-21 | 1997-05-28 | 株式会社ソディック | Pre-plastic injection molding machine |
| JPH0691695A (en) * | 1992-09-11 | 1994-04-05 | Sodick Co Ltd | Purge method of preplastication type injection molding machine |
| DE4395826C2 (en) * | 1992-11-06 | 2001-02-15 | Sodick Co Ltd | Preplasticization injection molding machine |
| JP2654897B2 (en) * | 1992-11-11 | 1997-09-17 | 株式会社ソディック | Discharge method of residual material of screw prepura type injection molding machine |
| US5858420A (en) * | 1997-08-13 | 1999-01-12 | Husky Injection Molding Systems Ltd. | Flow regulating and distributing assembly |
| JP5271675B2 (en) * | 2008-11-13 | 2013-08-21 | 株式会社ソディック | Pre-plastic injection device |
-
1990
- 1990-10-09 JP JP27192790A patent/JPH0645161B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04147819A (en) | 1992-05-21 |
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