JP3127391B2 - Pre-plastic injection molding machine and control method therefor - Google Patents

Pre-plastic injection molding machine and control method therefor

Info

Publication number
JP3127391B2
JP3127391B2 JP08294803A JP29480396A JP3127391B2 JP 3127391 B2 JP3127391 B2 JP 3127391B2 JP 08294803 A JP08294803 A JP 08294803A JP 29480396 A JP29480396 A JP 29480396A JP 3127391 B2 JP3127391 B2 JP 3127391B2
Authority
JP
Japan
Prior art keywords
injection
resin
cylinder
plunger
molding machine
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
Application number
JP08294803A
Other languages
Japanese (ja)
Other versions
JPH10138301A (en
Inventor
孝浩 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissei Plastic Industrial Co Ltd
Original Assignee
Nissei Plastic Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissei Plastic Industrial Co Ltd filed Critical Nissei Plastic Industrial Co Ltd
Priority to JP08294803A priority Critical patent/JP3127391B2/en
Publication of JPH10138301A publication Critical patent/JPH10138301A/en
Application granted granted Critical
Publication of JP3127391B2 publication Critical patent/JP3127391B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は射出装置と可塑化装
置を別体に備えるプリプラ式射出成形機及びその制御方
法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-plastic injection molding machine having an injection device and a plasticizing device separately, and a control method thereof.

【0002】[0002]

【従来の技術】従来、射出装置と可塑化装置を別体に備
えるプリプラ式射出成形機は、例えば、特開平8−25
437号公報で知られている。
2. Description of the Related Art Conventionally, a prepra-type injection molding machine having an injection device and a plasticizing device separately is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 8-25.
No. 437.

【0003】この種のプリプラ式射出成形機は、基本構
成として、射出プランジャを内蔵した射出筒を有する射
出装置と可塑化スクリュを内蔵した加熱筒を有する可塑
化装置とを備え、加熱筒の前端内部と射出筒の前端内部
は、樹脂供給通路により連通接続するとともに、図6に
示すように射出筒50内に臨む樹脂供給通路51の供給
口50eは、当該射出筒50の内周面における前上端部
に開口させていた。
[0003] This kind of pre-plastic injection molding machine basically comprises an injection device having an injection cylinder having an injection plunger therein and a plasticizing device having a heating cylinder having a plasticizing screw therein. The inside and the front end of the injection cylinder are connected to each other by a resin supply passage, and the supply port 50e of the resin supply passage 51 facing the inside of the injection cylinder 50 is connected to the front of the inner peripheral surface of the injection cylinder 50 as shown in FIG. It was open at the upper end.

【0004】このようなプリプラ式射出成形機は、可塑
化装置における加熱筒の後部に成形材料(ペレット)が
供給されれば、成形材料は回転する可塑化スクリュと加
熱筒により可塑化され、この可塑化された樹脂Lは樹脂
供給通路51を通って供給口50eから射出筒50内に
おける射出プランジャ52の前方に供給される。この結
果、射出プランジャ52は後退し、計量が行われるとと
もに、計量の終了により、射出プランジャ52を前進さ
せれば、樹脂Lは金型キャビティ内に射出充填される。
In such a plastic injection molding machine, when a molding material (pellet) is supplied to a rear portion of a heating cylinder in a plasticizing apparatus, the molding material is plasticized by a rotating plasticizing screw and a heating cylinder. The plasticized resin L is supplied through the resin supply passage 51 from the supply port 50e to the front of the injection plunger 52 in the injection cylinder 50. As a result, the injection plunger 52 is retracted, the metering is performed, and when the injection plunger 52 is advanced by the end of the metering, the resin L is injected and filled into the mold cavity.

【0005】[0005]

【発明が解決しようとする課題】しかし、上述した従来
のプリプラ式射出成形機は、可塑化装置から供給される
樹脂Lが射出筒50の先端側に供給されるため、射出プ
ランジャ52の直前に存在する樹脂Lは、新たに供給さ
れる樹脂Lによって射出プランジャ52と一緒に射出筒
50の後方に押し戻され、射出筒50内に長期に残留す
ることにより、熱履歴の異なった樹脂Lが混在したり樹
脂焼けが発生する等の問題があった。しかも、図6から
明らかなように、クッション量が大きくなった場合に
は、これに応じて射出筒50内に残留する樹脂Lも多く
なるため、大きなクッション量を必要としても設定する
クッション量は妥協的にならざるを得ず、高品質で安定
した成形品を得れない問題があった。
However, in the above-described conventional pre-plastic injection molding machine, since the resin L supplied from the plasticizing device is supplied to the tip end of the injection cylinder 50, the resin L is supplied immediately before the injection plunger 52. The existing resin L is pushed back together with the injection plunger 52 to the rear of the injection cylinder 50 by the newly supplied resin L, and remains in the injection cylinder 50 for a long time, so that the resins L having different heat histories are mixed. There were problems such as dripping and resin burning. Moreover, as is apparent from FIG. 6, when the cushion amount increases, the amount of the resin L remaining in the injection cylinder 50 increases accordingly, so that even if a large cushion amount is required, the set cushion amount is There was a problem that a high quality and stable molded product could not be obtained without compromising.

【0006】本発明はこのような従来の技術に存在する
課題を解決したものであり、射出筒内における樹脂の長
期残留を排除し、熱履歴の異なった樹脂の混在や樹脂焼
け等を解消するとともに、樹脂や金型の種類に応じた最
適なクッション量を設定することにより、高品質で安定
した成形品を得ることができるプリプラ式射出成形機及
びその制御方法の提供を目的とする。
The present invention has been made to solve the problems existing in the prior art, and eliminates a long-term residual resin in an injection cylinder and eliminates the mixture of resins having different heat histories and the burning of the resin. In addition, an object of the present invention is to provide a pre-plastic injection molding machine capable of obtaining a high-quality and stable molded product by setting an optimal cushion amount according to the type of a resin or a mold, and a control method thereof.

【0007】[0007]

【課題を解決するための手段及び実施の形態】本発明に
係るプリプラ式射出成形機1は、射出プランジャ3を内
蔵した射出筒4を有する射出装置2と、射出筒4内にお
ける射出プランジャ3の前方に樹脂Lを供給する可塑化
スクリュ6を内蔵した加熱筒7を有する可塑化装置5と
を備えるとともに、特に、射出筒4の内周面4iにおけ
る前部4fの内径Dfを大きくして当該内周面4iに段
差面8を形成し、かつ可塑化装置5から射出筒4内に供
給される樹脂Lが段差面8に当たるように傾斜させた樹
脂供給通路9を形成してなることを特徴とする。この場
合、好適な実施の形態により、射出筒4内に臨む樹脂供
給通路9は、複数の分岐通路部9a,9b,9cにより
構成し、各分岐通路部9a…を射出筒4の周方向へ所定
間隔置きに配することができる。
Means and embodiments of the present invention A plastic injection molding machine 1 according to the present invention comprises an injection device 2 having an injection cylinder 4 having an injection plunger 3 built therein, and an injection plunger 3 in the injection cylinder 4. A plasticizing device 5 having a heating cylinder 7 having a plasticizing screw 6 for supplying the resin L in the front, and in particular, increasing the inner diameter Df of the front portion 4f of the inner peripheral surface 4i of the injection cylinder 4 by increasing the inner diameter Df. A stepped surface 8 is formed on the inner peripheral surface 4i, and a resin supply passage 9 inclined so that the resin L supplied into the injection cylinder 4 from the plasticizing device 5 hits the stepped surface 8 is formed. And In this case, according to the preferred embodiment, the resin supply passage 9 facing the inside of the injection cylinder 4 is constituted by a plurality of branch passages 9a, 9b, 9c, and each of the branch passages 9a. They can be arranged at predetermined intervals.

【0008】また、本発明に係るプリプラ式射出成形機
の制御方法は、このようなプリプラ式射出成形機1を使
用し、特に、射出プランジャ3の最前進位置Pf(射出
完了位置)における先端エッジ部3sが射出筒4内に開
口する樹脂供給通路9の供給口10の後側縁部10rよ
りも前方に位置するように、射出プランジャ3に対する
位置制御を行うようにしたことを特徴とする。この場
合、好適な実施の形態により、最前進位置Pfにおける
先端エッジ部3sが供給口10の後側縁部10rと前側
縁部10fの間に位置するように、射出プランジャ3に
対する位置制御を行うことが望ましい。
Further, the control method of the pre-plastic injection molding machine according to the present invention uses such a pre-plastic injection molding machine 1, and particularly, the leading edge of the injection plunger 3 at the most advanced position Pf (injection completion position). The position of the injection plunger 3 is controlled so that the portion 3s is located forward of the rear edge 10r of the supply port 10 of the resin supply passage 9 opening into the injection cylinder 4. In this case, according to the preferred embodiment, the position of the injection plunger 3 is controlled such that the leading edge 3s at the most advanced position Pf is located between the rear edge 10r and the front edge 10f of the supply port 10. It is desirable.

【0009】これにより、最前進位置Pfにおける射出
プランジャ3の先端エッジ部3sが、供給口10の後側
縁部10rよりも前方に位置するように制御すれば、供
給口10から射出筒4内に供給される樹脂Lは、段差面
8に当たり、かつ供給初期には当該段差面8に沿って移
動することにより、新たに供給された樹脂Lは残留した
樹脂Lの後方に入り込む。この結果、残留した樹脂Lは
次の射出工程において金型キャビティ内に射出充填さ
れ、樹脂Lの長期残留が排除される。また、段差面8か
ら前方における内周面4iの内径はDfとなるため、射
出プランジャ3と当該内周面4i間には、段差面8に対
応する隙間が形成される。したがって、供給口10は射
出プランジャ3の存在によっては閉塞されないため、射
出プランジャ3を任意の最前進位置Pfに停止させるこ
とにより、任意のクッション量を設定できる。
By controlling the leading edge 3s of the injection plunger 3 at the most advanced position Pf so as to be located forward of the rear edge 10r of the supply port 10, the inside of the injection cylinder 4 from the supply port 10 can be controlled. Is supplied to the stepped surface 8 and moves along the stepped surface 8 in the initial stage of supply, so that the newly supplied resin L enters behind the remaining resin L. As a result, the remaining resin L is injected and filled into the mold cavity in the next injection step, and long-term residual resin L is eliminated. Further, since the inner diameter of the inner peripheral surface 4i in front of the step surface 8 is Df, a gap corresponding to the step surface 8 is formed between the injection plunger 3 and the inner peripheral surface 4i. Therefore, since the supply port 10 is not closed by the existence of the injection plunger 3, an arbitrary cushion amount can be set by stopping the injection plunger 3 at an arbitrary most advanced position Pf.

【0010】[0010]

【実施例】次に、本発明に係る好適な実施例を挙げ、図
面に基づき詳細に説明する。
Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

【0011】まず、本実施例に係るプリプラ式射出成形
機1の全体的概略構成について、図4を参照して説明す
る。
First, an overall schematic configuration of a pre-plastic injection molding machine 1 according to the present embodiment will be described with reference to FIG.

【0012】図4において、プリプラ式射出成形機1は
射出装置2と可塑化装置5を備える。射出装置2は射出
筒4を備え、この射出筒4には射出プランジャ3を内蔵
する。また、射出筒4の前端には射出ノズル21を有す
るとともに、射出筒4の後端には射出プランジャ3を前
進又は後退させる不図示のプランジャ駆動部を備える。
一方、可塑化装置5は加熱筒7を備え、この加熱筒7に
は可塑化スクリュ6を内蔵する。また、加熱筒7の後部
には可塑化スクリュ6を回転させる不図示のスクリュ駆
動部及び加熱筒7の内部に成形材料を供給する不図示の
ホッパを備える。そして、加熱筒7の前端内部と射出筒
4の前端内部は、樹脂供給通路9を介して連通接続す
る。なお、22…は射出筒4及び加熱筒7の外周面に装
着した加熱ヒータである。
In FIG. 4, a pre-plastic injection molding machine 1 includes an injection device 2 and a plasticizing device 5. The injection device 2 includes an injection cylinder 4, and the injection cylinder 4 incorporates the injection plunger 3. The injection cylinder 4 has an injection nozzle 21 at the front end and a plunger drive unit (not shown) for moving the injection plunger 3 forward or backward at the rear end.
On the other hand, the plasticizing device 5 includes a heating cylinder 7, and the heating cylinder 7 incorporates the plasticizing screw 6. In addition, a screw driving section (not shown) for rotating the plasticizing screw 6 and a hopper (not shown) for supplying a molding material into the heating cylinder 7 are provided at a rear portion of the heating cylinder 7. The inside of the front end of the heating cylinder 7 and the inside of the front end of the injection cylinder 4 are connected to each other through a resin supply passage 9. 22 are heaters mounted on the outer peripheral surfaces of the injection cylinder 4 and the heating cylinder 7.

【0013】次に、当該プリプラ式射出成形機1におけ
る本発明の要部構成について、図1〜図5を参照して説
明する。
Next, the main structure of the present invention in the pre-plastic injection molding machine 1 will be described with reference to FIGS.

【0014】まず、射出筒4の内周面4iは、図1に示
すように前部4fの内径Dfを大きくし、これにより、
当該内周面4iに段差面8を形成する。この場合、内径
Dfにより形成する内周面4iの軸方向長さは任意に選
定できる。また、段差面8は内周面4iに対して直角に
形成することが望ましい。
First, as shown in FIG. 1, the inner peripheral surface 4i of the injection cylinder 4 increases the inner diameter Df of the front part 4f, thereby
A step surface 8 is formed on the inner peripheral surface 4i. In this case, the axial length of the inner peripheral surface 4i formed by the inner diameter Df can be arbitrarily selected. Further, it is desirable that the step surface 8 is formed at right angles to the inner peripheral surface 4i.

【0015】一方、樹脂供給通路9は、可塑化装置5か
ら供給される樹脂Lが段差面8に当たるように設ける。
したがって、射出筒4内に臨む樹脂供給通路9の供給口
10は段差面8の手前に開口させるとともに、この供給
口10に連通する樹脂供給通路9、特に、射出筒4側に
位置する樹脂供給通路9の一部9pは、供給される樹脂
Lが段差面8に当たる方向に傾斜させる。なお、このよ
うな樹脂供給通路9は図1及び図2に示すように単一で
あってもよいし、図5に示すように、複数(実施例は三
つ)の分岐通路部9a,9b,9cにより構成し、各分
岐通路部9a,9b,9cを射出筒4の周方向へ等間隔
置きに配してもよい。このような構成により、長期に残
留する樹脂Lをより確実に排除できる。
On the other hand, the resin supply passage 9 is provided such that the resin L supplied from the plasticizing device 5 hits the step surface 8.
Therefore, the supply port 10 of the resin supply passage 9 facing the inside of the injection cylinder 4 is opened before the step surface 8, and the resin supply passage 9 communicating with the supply port 10, particularly, the resin supply passage located on the injection cylinder 4 side. A part 9 p of the passage 9 is inclined in a direction in which the supplied resin L hits the step surface 8. The resin supply passage 9 may be a single resin supply passage 9 as shown in FIGS. 1 and 2, or a plurality (three in the embodiment) of branch passage portions 9a and 9b as shown in FIG. , 9c, and the branch passage portions 9a, 9b, 9c may be arranged at equal intervals in the circumferential direction of the injection cylinder 4. With such a configuration, the resin L remaining for a long time can be more reliably eliminated.

【0016】次に、このようなプリプラ式射出成形機1
の動作を含む本実施例に係る制御方法について、図1〜
図5を参照して説明する。
Next, such a pre-plastic injection molding machine 1
The control method according to the present embodiment including the operation of FIG.
This will be described with reference to FIG.

【0017】今、射出プランジャ3が最前進位置Pfま
で移動することにより、射出工程が終了した場合を想定
する。この状態を図1に示す。
Now, it is assumed that the injection step is completed by moving the injection plunger 3 to the most advanced position Pf. This state is shown in FIG.

【0018】この場合、射出装置2に備える不図示のプ
ランジャ駆動部は、射出プランジャ3が最前進位置Pf
に停止するように制御する。即ち、射出プランジャ3の
最前進位置Pfを、射出プランジャ3の先端エッジ部3
sが供給口10の後側縁部10rと前側縁部10fの間
に位置するように、予め目標値として設定し、射出工程
が終了した際に、射出プランジャ3が最前進位置Pfに
停止するように、射出プランジャ3に対する位置制御を
行う。したがって、調整運転中に射出プランジャ3の停
止位置が最前進位置Pfからズレている場合には、作業
者はスイッチ等を押すことにより自動的に修正すること
が可能である。また、自動運転時に、射出プランジャ3
の停止位置が最前進位置Pfから連続して外れた場合に
は異常警報を発する。
In this case, a plunger driving unit (not shown) provided in the injection device 2 is configured to move the injection plunger 3 to the most advanced position Pf.
Control to stop. That is, the most advanced position Pf of the injection plunger 3 is set to the leading edge 3 of the injection plunger 3.
s is set in advance as a target value so that s is located between the rear edge 10r and the front edge 10f of the supply port 10, and when the injection process ends, the injection plunger 3 stops at the most advanced position Pf. Thus, the position control for the injection plunger 3 is performed. Therefore, when the stop position of the injection plunger 3 is deviated from the most advanced position Pf during the adjustment operation, the operator can automatically correct the position by pressing a switch or the like. Also, during automatic operation, the injection plunger 3
When the stop position is continuously deviated from the most forward position Pf, an abnormality alarm is issued.

【0019】一方、成形材料(ペレット)は可塑化装置
5に備える不図示のホッパから加熱筒7の内部に供給さ
れる。これにより、成形材料は回転する可塑化スクリュ
6及び加熱筒7により可塑化され、この可塑化された樹
脂Lは樹脂供給通路9を通って供給口10から射出筒4
内における射出プランジャ3の前方に供給される。
On the other hand, a molding material (pellet) is supplied from a hopper (not shown) provided in the plasticizing device 5 into the heating cylinder 7. As a result, the molding material is plasticized by the rotating plasticizing screw 6 and the heating cylinder 7, and the plasticized resin L passes through the resin supply passage 9 from the supply port 10 to the injection cylinder 4.
Is supplied in front of the injection plunger 3.

【0020】この際、供給口10から供給される樹脂L
は、図3に示す矢印F方向に移動する。即ち、段差面8
に当たり、かつ供給初期には当該段差面8に沿って移動
することにより、新たに供給された樹脂Lは残留した樹
脂Lの後方に入り込む。この結果、残留した樹脂Lは次
の射出工程において金型キャビティ内に射出充填され、
樹脂Lの長期残留が排除される。また、段差面8から前
方における内周面4iの内径はDfとなるため、射出プ
ランジャ3と当該内周面4i間には、段差面8に対応す
る隙間が形成される。したがって、供給口10は射出プ
ランジャ3の存在によっては閉塞されないため、射出プ
ランジャ3を任意の最前進位置Pfに停止させることに
より、任意のクッション量を設定できる。
At this time, the resin L supplied from the supply port 10
Moves in the direction of arrow F shown in FIG. That is, the step surface 8
And moves along the step surface 8 in the initial stage of supply, so that the newly supplied resin L enters behind the remaining resin L. As a result, the remaining resin L is injected and filled into the mold cavity in the next injection step,
The long-term residue of the resin L is eliminated. Further, since the inner diameter of the inner peripheral surface 4i in front of the step surface 8 is Df, a gap corresponding to the step surface 8 is formed between the injection plunger 3 and the inner peripheral surface 4i. Therefore, since the supply port 10 is not closed by the existence of the injection plunger 3, an arbitrary cushion amount can be set by stopping the injection plunger 3 at an arbitrary most advanced position Pf.

【0021】そして、樹脂Lが供給口10から射出筒4
内に供給されれば、射出プランジャ3は後退し、計量が
行われるとともに、計量の終了により、射出プランジャ
3を前進させれば、樹脂Lは射出ノズル21を通って金
型キャビティ内に射出充填される。
Then, the resin L is supplied from the supply port 10 to the injection cylinder 4.
When the injection plunger 3 is retracted, the injection plunger 3 is retracted, the measurement is performed, and when the injection plunger 3 is advanced by the end of the measurement, the resin L is injected into the mold cavity through the injection nozzle 21. Is done.

【0022】以上、実施例について詳細に説明したが、
本発明はこのような実施例に限定されるものではなく、
細部の構成,形状,数量,手法等において、本発明の要
旨を逸脱しない範囲で任意に変更できる。
The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The configuration, shape, quantity, method, and the like of the details can be arbitrarily changed without departing from the gist of the present invention.

【0023】例えば、射出プランジャ3の最前進位置P
fにおける先端エッジ部3sは供給口10の前側縁部1
0fよりも前方に位置する制御を行ってもよい。また、
段差面8は必要により射出プランジャ3に設けてもよ
く、このような変更実施は本発明の均等範囲に包含され
る。
For example, the most advanced position P of the injection plunger 3
f is the front edge 1 of the supply port 10.
Control located ahead of 0f may be performed. Also,
The step surface 8 may be provided on the injection plunger 3 if necessary, and such modifications are included in the equivalent scope of the present invention.

【0024】[0024]

【発明の効果】このように、本発明に係るプリプラ式射
出成形機は、射出筒の内周面における前部の内径を大き
くして当該内周面に段差面を形成し、かつ可塑化装置か
ら射出筒内に供給される樹脂が段差面に当たるように傾
斜させた樹脂供給通路を形成してなるとともに、本発明
に係る制御方法は、当該プリプラ式射出成形機を使用
し、射出プランジャの最前進位置における先端エッジ部
が射出筒内に開口する樹脂供給通路の供給口の後側縁部
よりも前方に位置するように、射出プランジャに対する
位置制御を行うようにしたため、次のような顕著な効果
を奏する。
As described above, in the pre-plastic injection molding machine according to the present invention, the inner diameter of the front portion of the inner peripheral surface of the injection cylinder is increased to form a step surface on the inner peripheral surface, and the plasticizing device is used. A resin supply passage which is inclined so that the resin supplied from inside to the injection cylinder hits the stepped surface, and the control method according to the present invention uses the prepra-type injection molding machine, and controls the injection plunger. The position of the injection plunger is controlled so that the leading edge at the forward position is located ahead of the rear edge of the supply port of the resin supply passage opening into the injection cylinder. It works.

【0025】 射出筒内における樹脂の長期残留を排
除することにより、熱履歴の異なった樹脂の混在や樹脂
焼け等を解消できる。
By eliminating the long-term residual resin in the injection cylinder, it is possible to eliminate the mixture of resins having different thermal histories and the burning of the resin.

【0026】 樹脂や金型の種類に応じた最適なクッ
ション量を設定することにより、高品質で安定した成形
品を得ることができる。
By setting an optimal cushion amount according to the type of resin or mold, a high-quality and stable molded product can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本実施例に係るプリプラ式射出成形機の要部の
断面側面図、
FIG. 1 is a cross-sectional side view of a main part of a pre-plastic injection molding machine according to the present embodiment,

【図2】図1中A−A線断面図、FIG. 2 is a sectional view taken along line AA in FIG.

【図3】同プリプラ式射出成形機の要部における作用説
明図、
FIG. 3 is an operation explanatory view of a main part of the pre-plastic injection molding machine,

【図4】同プリプラ式射出成形機の全体的概略構成図、FIG. 4 is an overall schematic configuration diagram of the pre-plastic injection molding machine;

【図5】同プリプラ式射出成形機における樹脂供給通路
の変更例を示す構成図、
FIG. 5 is a configuration diagram showing a modified example of a resin supply passage in the pre-plastic injection molding machine;

【図6】従来の技術に係るプリプラ式射出成形機の要部
の断面側面図、
FIG. 6 is a cross-sectional side view of a main part of a pre-plastic injection molding machine according to a conventional technique;

【符号の説明】[Explanation of symbols]

1 プリプラ式射出成形機 2 射出装置 3 射出プランジャ 3s 先端エッジ部 4 射出筒 4i 内周面 4f 前部 5 可塑化装置 6 可塑化スクリュ 7 加熱筒 8 段差面 9 樹脂供給通路 9a… 分岐通路部 10 供給口 10r 後側縁部 10f 前側縁部 L 樹脂 Df 内径 Pf 最前進位置 DESCRIPTION OF SYMBOLS 1 Pre-plastic injection molding machine 2 Injection apparatus 3 Injection plunger 3s Tip edge part 4 Injection cylinder 4i Inner peripheral surface 4f Front part 5 Plasticizing device 6 Plasticizing screw 7 Heating cylinder 8 Step surface 9 Resin supply passage 9a ... Branch passage 10 Supply port 10r Rear edge 10f Front edge L Resin Df Inner diameter Pf Most advanced position

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 射出プランジャを内蔵した射出筒を有す
る射出装置と、前記射出筒内における射出プランジャの
前方に樹脂を供給する可塑化スクリュを内蔵した加熱筒
を有する可塑化装置とを備えるプリプラ式射出成形機に
おいて、前記射出筒の内周面における前部の内径を大き
くして当該内周面に段差面を形成し、かつ前記可塑化装
置から前記射出筒内に供給される樹脂が前記段差面に当
たるように傾斜させた樹脂供給通路を形成してなること
を特徴とするプリプラ式射出成形機。
1. A pre-plasticizer comprising: an injection device having an injection cylinder having a built-in injection plunger; and a plasticizing device having a heating cylinder having a built-in plasticizing screw for supplying a resin in front of the injection plunger in the injection cylinder. In the injection molding machine, the inner diameter of the front portion of the inner peripheral surface of the injection cylinder is increased to form a stepped surface on the inner peripheral surface, and the resin supplied from the plasticizing device into the injection cylinder is supplied to the stepped portion. A pre-plastic injection molding machine characterized by forming a resin supply passage inclined so as to hit a surface.
【請求項2】 前記射出筒内に臨む樹脂供給通路は、複
数の分岐通路部を有し、各分岐通路部を前記射出筒の周
方向へ所定間隔置きに配してな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機。
2. The resin supply passage facing the inside of the injection cylinder has a plurality of branch passages, and the branch passages are arranged at predetermined intervals in a circumferential direction of the injection cylinder. The pre-plastic injection molding machine according to claim 1.
【請求項3】 射出プランジャを内蔵した射出筒を有す
る射出装置と、前記射出筒内における射出プランジャの
前方に樹脂を供給する可塑化スクリュを内蔵した加熱筒
を有する可塑化装置とを備えるとともに、前記射出筒の
内周面における前部の内径を大きくして当該内周面に段
差面を形成し、かつ前記可塑化装置から前記射出筒内に
供給される樹脂が前記段差面に当たるように傾斜させた
樹脂供給通路を形成したプリプラ式射出成形機を制御す
るに際し、前記射出プランジャの最前進位置における先
端エッジ部が前記射出筒内に開口する前記樹脂供給通路
の供給口の後側縁部よりも前方に位置するように、前記
射出プランジャに対する位置制御を行うことを特徴とす
るプリプラ式射出成形機の制御方法。
3. An injection device having an injection cylinder having a built-in injection plunger, and a plasticizing device having a heating cylinder having a built-in plasticizing screw for supplying a resin in front of the injection plunger in the injection cylinder, Increasing the inside diameter of the front part of the inner peripheral surface of the injection cylinder to form a step surface on the inner peripheral surface, and inclining so that the resin supplied from the plasticizing device into the injection cylinder hits the step surface. In controlling the pre-plasticization injection molding machine having the resin supply passage formed, the leading edge portion of the injection plunger at the most advanced position is closer to the rear edge of the supply port of the resin supply passage opening into the injection cylinder. Controlling the position of the injection plunger so that the injection plunger is also located forward.
【請求項4】 前記最前進位置における前記先端エッジ
部が前記供給口の後側縁部と前側縁部の間に位置するよ
うに、前記射出プランジャに対する位置制御を行うこと
を特徴とする請求項3記載のプリプラ式射出成形機の制
御方法。
4. The position control of the injection plunger is performed so that the leading edge at the most advanced position is located between a rear edge and a front edge of the supply port. 4. The control method of the prepra injection molding machine according to 3.
JP08294803A 1996-11-07 1996-11-07 Pre-plastic injection molding machine and control method therefor Expired - Fee Related JP3127391B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08294803A JP3127391B2 (en) 1996-11-07 1996-11-07 Pre-plastic injection molding machine and control method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08294803A JP3127391B2 (en) 1996-11-07 1996-11-07 Pre-plastic injection molding machine and control method therefor

Publications (2)

Publication Number Publication Date
JPH10138301A JPH10138301A (en) 1998-05-26
JP3127391B2 true JP3127391B2 (en) 2001-01-22

Family

ID=17812472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP08294803A Expired - Fee Related JP3127391B2 (en) 1996-11-07 1996-11-07 Pre-plastic injection molding machine and control method therefor

Country Status (1)

Country Link
JP (1) JP3127391B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100592140B1 (en) * 2002-11-26 2006-06-23 도시미치 니시자와 Injection molding machine

Also Published As

Publication number Publication date
JPH10138301A (en) 1998-05-26

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