JPH06312431A - Method and apparatus for hollow injection molding - Google Patents
Method and apparatus for hollow injection moldingInfo
- Publication number
- JPH06312431A JPH06312431A JP12470593A JP12470593A JPH06312431A JP H06312431 A JPH06312431 A JP H06312431A JP 12470593 A JP12470593 A JP 12470593A JP 12470593 A JP12470593 A JP 12470593A JP H06312431 A JPH06312431 A JP H06312431A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection molding
- hydraulic
- pressurized gas
- source
- 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.)
- Withdrawn
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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1732—Control circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金型キャビティへの溶
融樹脂の射出と、圧縮機によって高圧タンク内に蓄えら
れた加圧ガスの金型キャビティへの圧入とを行う中空射
出成形方法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow injection molding method for injecting a molten resin into a mold cavity and pressurizing a pressurized gas stored in a high pressure tank by a compressor into the mold cavity. Regarding the device.
【０００２】[0002]
【従来の技術】従来、圧縮機によって高圧タンク内に蓄
えられた加圧ガスを金型キャビティへ圧入する中空射出
成形において、圧縮機としては、電動式多段圧縮機、電
動式ブースター圧縮機、エアー駆動式ブースター圧縮
機、油圧駆動式ブースター圧縮機等が使用されている
が、いずれも専用の駆動源を備えたものとなっている。2. Description of the Related Art Conventionally, in hollow injection molding in which a pressurized gas stored in a high pressure tank by a compressor is press-fitted into a mold cavity, a compressor is an electric multistage compressor, an electric booster compressor, an air compressor. Drive-type booster compressors, hydraulic drive-type booster compressors, etc. are used, but each has a dedicated drive source.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記圧縮機
のうち、中空射出成形を行うに当り最も信頼性のある圧
縮機は油圧駆動式ブースター圧縮機等の油圧駆動式圧縮
機である。Among the above compressors, the most reliable compressor for performing hollow injection molding is a hydraulic drive type compressor such as a hydraulic drive type booster compressor.
【０００４】しかしながら、専用の油圧ポンプや油タン
ク並びに大量の作動油を含む油圧源を用意しなければな
らず、設備的負担が大きい問題がある。However, a dedicated hydraulic pump, an oil tank, and a hydraulic power source containing a large amount of hydraulic oil must be prepared, which poses a large facility burden.
【０００５】本発明は、金型キャビティへの溶融樹脂の
射出と、油圧駆動式圧縮機によって高圧タンク内に蓄え
られた加圧ガスの金型キャビティへの圧入とを行う中空
射出成形において、専用の油圧源が必要となることによ
る設備的負担を軽減することを目的とする。The present invention is dedicated to hollow injection molding in which the molten resin is injected into the mold cavity and the pressurized gas stored in the high pressure tank by the hydraulically driven compressor is pressed into the mold cavity. The purpose of this is to reduce the facility burden due to the need for the hydraulic power source.
【０００６】[0006]
【課題を解決するための手段】このために本発明で講じ
られた手段を、一実施例の説明図である図１で説明する
と、請求項１の発明では、高圧タンク１内の昇圧を、射
出成形装置２の油圧源３で油圧駆動式圧縮機４を駆動す
ることで行うこととしているものである。Means for solving the problems will be described with reference to FIG. 1 which is an explanatory view of an embodiment. In the invention of claim 1, the pressure in the high-pressure tank 1 is increased. This is performed by driving the hydraulically driven compressor 4 with the hydraulic power source 3 of the injection molding device 2.
【０００７】また、請求項３の発明では、油圧供給弁５
ａを介して射出成形装置２の油圧源３に接続された油圧
駆動式圧縮機４と、高圧タンク１内の圧力を検知し、高
圧タンク１内の圧力が所定の下限圧力以下になった時に
低下圧力信号を発する圧力検知器６と、圧力検知器６か
らの低下圧力信号を受信した時に、油圧供給弁開信号を
油圧供給弁５ａへ発信して、射出成形装置２の油圧源３
からの油圧を油圧駆動式圧縮機４へ供給するシーケンサ
ー７とを設けることとしているものである。According to the third aspect of the invention, the hydraulic pressure supply valve 5
When the pressure in the high pressure tank 1 and the hydraulically driven compressor 4 connected to the hydraulic source 3 of the injection molding device 2 via a is detected, and the pressure in the high pressure tank 1 becomes equal to or lower than a predetermined lower limit pressure, When the pressure detector 6 that emits the lowered pressure signal and the lowered pressure signal from the pressure detector 6 are received, a hydraulic pressure supply valve open signal is transmitted to the hydraulic pressure supply valve 5a, and the hydraulic pressure source 3 of the injection molding apparatus 2 is transmitted.
And a sequencer 7 for supplying the hydraulic pressure from the hydraulic pressure compressor 4 to the hydraulically driven compressor 4.
【０００８】[0008]
【実施例及び作用】図１及び図２に基づいて本発明の一
実施例を説明する。尚、図中実線は加圧ガス及び油圧の
経路を示し、点線は各信号の経路を表わす。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the figure, the solid line indicates the path of the pressurized gas and the hydraulic pressure, and the dotted line indicates the path of each signal.
【０００９】図中８は加圧ガスとして使用するガスを収
容したガスボンベ等のガス源で、使用するガスとして
は、例えば炭酸ガスや空気等でもよいが、窒素等の不活
性ガスが好ましい。Reference numeral 8 in the drawing denotes a gas source such as a gas cylinder containing a gas used as a pressurized gas. The gas used may be, for example, carbon dioxide gas or air, but an inert gas such as nitrogen is preferable.
【００１０】ガス源８からのガスは、減圧弁９によって
減圧された上で回収タンク１０に蓄えられる。回収タン
ク１０の圧力は、後述する加圧ガスの回収のしやすさ等
の理由から、９ｋｇ／ｃｍ2 Ｇ未満であることが好まし
い。The gas from the gas source 8 is decompressed by the decompression valve 9 and then stored in the recovery tank 10. The pressure of the recovery tank 10 is preferably less than 9 kg / cm 2 G for reasons such as ease of recovery of the pressurized gas described later.
【００１１】回収タンク１０内のガスは、油圧駆動式圧
縮機４で昇圧される。図示される油圧駆動式圧縮機４
は、油圧駆動式ブースター圧縮機で、まず図中右側の低
圧シリンダー１１内で圧縮したガスを、次に左側の高圧
シリンダー１２内に送って所定の圧力まで圧縮するもの
である。The gas in the recovery tank 10 is boosted by the hydraulically driven compressor 4. Hydraulically driven compressor 4 shown
Is a hydraulically driven booster compressor, which first compresses the gas compressed in the low pressure cylinder 11 on the right side in the figure and then sends it to the high pressure cylinder 12 on the left side to compress it to a predetermined pressure.
【００１２】尚、１３は油圧駆動シリンダー、１４は自
動切り換え弁、１５ａ〜１５ｄは逆止弁である。Reference numeral 13 is a hydraulically driven cylinder, 14 is an automatic switching valve, and 15a to 15d are check valves.
【００１３】上記油圧駆動式圧縮機４は、射出成形装置
２の油圧源３によって駆動されるものとなっている。The hydraulically driven compressor 4 is driven by the hydraulic power source 3 of the injection molding apparatus 2.
【００１４】油圧源３は、図２に明示されるように、通
常用いられているものと同様のもので、油タンク１６内
の作動油を送り出す油圧ポンプ１７と、油圧ポンプ１７
の送出側に接続されたリリーフ弁１８と、油圧ポンプ１
７の送出側に逆止弁１５ｅを介して接続されたアキュー
ムレーター１９を備えている。As shown in FIG. 2, the hydraulic pressure source 3 is the same as the one normally used, and includes a hydraulic pump 17 for sending out the hydraulic oil in the oil tank 16 and a hydraulic pump 17.
Relief valve 18 connected to the delivery side of the hydraulic pump 1
The accumulator 19 is connected to the delivery side of No. 7 via the check valve 15e.
【００１５】油圧駆動式圧縮機４は、上記油圧源３から
の射出成形装置２への油圧供給経路を分岐させ、油圧供
給弁５ａを介して接続されている。尚、５ｂは射出成形
装置２への油圧供給経路に介在された油圧供給弁であ
る。また、図２において射出成形装置２からの油圧戻り
経路は省略されている。The hydraulic drive type compressor 4 branches the hydraulic pressure supply path from the hydraulic pressure source 3 to the injection molding apparatus 2 and is connected via a hydraulic pressure supply valve 5a. Incidentally, 5b is a hydraulic pressure supply valve interposed in a hydraulic pressure supply path to the injection molding device 2. Also, in FIG. 2, the hydraulic pressure return path from the injection molding device 2 is omitted.
【００１６】中空射出成形に必要な加圧ガスは、油圧駆
動式圧縮機４を射出成形装置２に付随する油圧源３で駆
動することで充分得ることが可能である。The pressurized gas required for hollow injection molding can be sufficiently obtained by driving the hydraulically driven compressor 4 with the hydraulic pressure source 3 attached to the injection molding apparatus 2.
【００１７】例えば、大型の射出成形装置２の場合、付
随する油圧源３の能力も高く、充分な量及び圧力の加圧
ガスを得ることができる。また、小型の射出成形装置２
の場合、付随する油圧源３の能力は大型のものより低い
のが通常であるが、成形する中空成形品も小型であるの
で、加圧ガスの消費量は少なくて済む。従って、この場
合にも必要な加圧ガスを充分得ることができる。For example, in the case of a large-sized injection molding apparatus 2, the capacity of the associated hydraulic pressure source 3 is also high, and it is possible to obtain a pressurized gas of a sufficient amount and pressure. Also, a small injection molding device 2
In this case, the capacity of the associated hydraulic power source 3 is usually lower than that of the large-sized one, but the hollow molded product to be molded is also small in size, so that the amount of pressurized gas consumed is small. Therefore, also in this case, the required pressurized gas can be sufficiently obtained.
【００１８】油圧駆動式圧縮機４としては、油圧源３の
能力に応じて、油圧駆動シリンダー１３と、低圧シリン
ダー１１及び高圧シリンダー１２との断面積比を調節す
ることで必要な圧力の加圧ガスが得られることから、油
圧駆動式ブースター圧縮機が好ましい。As the hydraulic drive type compressor 4, the necessary pressure is applied by adjusting the cross-sectional area ratio between the hydraulic drive cylinder 13 and the low pressure cylinder 11 and the high pressure cylinder 12 according to the capacity of the hydraulic power source 3. Hydraulically driven booster compressors are preferred because they provide gas.
【００１９】油圧駆動式圧縮機４で圧縮された加圧ガス
は、高圧タンク１に蓄えられ、中空成形に必要な圧力ま
で圧縮昇圧される。The pressurized gas compressed by the hydraulically driven compressor 4 is stored in the high pressure tank 1 and is compressed and pressurized to a pressure required for hollow molding.
【００２０】高圧タンク１には圧力検知器６が設けられ
ている。圧力検知器６は、高圧タンク１内の圧力が中空
成形に必要な所定の下限圧力以上になると正常圧力信号
をシーケンサー７に発信して加圧ガス圧入準備が整った
ことを知らせ、シーケンサー７から射出成形装置２へ射
出許可信号が発信される。The high pressure tank 1 is provided with a pressure detector 6. The pressure detector 6 sends a normal pressure signal to the sequencer 7 when the pressure in the high-pressure tank 1 becomes equal to or higher than a predetermined lower limit pressure required for hollow molding, and notifies that the pressurized gas injection preparation is completed. An injection permission signal is transmitted to the injection molding device 2.
【００２１】上記の状態では、油圧駆動式圧縮機４は駆
動を続けており、高圧タンク１内の圧力は更に高められ
る。In the above state, the hydraulic drive type compressor 4 continues to be driven and the pressure in the high pressure tank 1 is further increased.
【００２２】高圧タンク１内の圧力が更に高まって所定
の上限圧力に達すると、圧力検知器６はシーケンサー７
に超過圧力信号を発信する。これを受けたシーケンサー
７は、油圧供給弁５ａに油圧供給弁閉信号を発信し、油
圧供給弁５ａを閉じて油圧駆動式圧縮機４の駆動を止
め、高圧タンク１内の過剰な昇圧を防止する。When the pressure in the high-pressure tank 1 further increases and reaches a predetermined upper limit pressure, the pressure detector 6 causes the sequencer 7 to operate.
Send an overpressure signal to. Receiving this, the sequencer 7 sends a hydraulic pressure supply valve closing signal to the hydraulic pressure supply valve 5a to close the hydraulic pressure supply valve 5a to stop the drive of the hydraulically driven compressor 4 and prevent excessive pressure rise in the high pressure tank 1. To do.
【００２３】一方、後述する加圧ガスの圧入により、高
圧タンク１内の加圧ガスが消費され、高圧タンク１内の
圧力が低下して下限圧力まで低下すると、圧力検知器６
からシーケンサー７に低下圧力信号が発信される。これ
を受けたシーケンサー７は、油圧供給弁開信号を油圧供
給弁５ａに発信し、油圧供給弁５ａを解放して、再び油
圧駆動式圧縮機４を駆動させて高圧タンク１内を昇圧す
る。On the other hand, when the pressurized gas in the high-pressure tank 1 is consumed by the below-mentioned pressurization of the pressurized gas, and the pressure in the high-pressure tank 1 decreases to the lower limit pressure, the pressure detector 6
A low pressure signal is transmitted from the sequencer 7 to the sequencer 7. Receiving this, the sequencer 7 sends a hydraulic pressure supply valve open signal to the hydraulic pressure supply valve 5a, releases the hydraulic pressure supply valve 5a, and drives the hydraulic drive type compressor 4 again to increase the pressure in the high pressure tank 1.
【００２４】上述の下限圧力は、使用する樹脂及び成形
する中空成形品の形状等によっても相違するが、通常３
０〜２９０ｋｇ／ｃｍ2 Ｇ程度が好ましい。特に、加圧
ガスの圧入途中でこの下限圧力以下になっても、当該中
空成形品が不良品とならない程度の余裕のある値に設定
しておくことが好ましい。The above lower limit pressure is usually 3 although it varies depending on the resin used and the shape of the hollow molded product to be molded.
About 0 to 290 kg / cm 2 G is preferable. In particular, it is preferable that the hollow molded product is set to a value with a margin such that the hollow molded product does not become a defective product even if the pressure falls below the lower limit pressure during the pressurization of the pressurized gas.
【００２５】また、上限圧力は、高圧タンク１の大きさ
や成形すべき中空成形品の中空部の大きさ等によっても
相違するが、上記下限圧力より１〜１０ｋｇ／ｃｍ2 Ｇ
程度高い圧力であることが好ましい。Although the upper limit pressure varies depending on the size of the high-pressure tank 1 and the size of the hollow portion of the hollow molded article to be molded, the upper limit pressure is 1 to 10 kg / cm 2 G above the lower limit pressure.
It is preferable that the pressure is moderately high.
【００２６】特に、後で詳述する射出成形装置２の冷却
工程移行後から次の成形サイクルのための型締工程移行
までの間のみ油圧駆動式圧縮機４を駆動すれば、油圧源
３の油圧ポンプ１７にほとんど負荷が掛っていない時の
みを利用して駆動することができる。In particular, if the hydraulic drive type compressor 4 is driven only after the transition of the cooling step of the injection molding apparatus 2 which will be described later in detail until the transition of the mold clamping step for the next molding cycle. It can be driven only when the hydraulic pump 17 is barely loaded.
【００２７】ここで、冷却工程とは、溶融樹脂の射出を
完了した後、金型２１を開放する型開工程移行前までを
いう。また、型締工程とは、金型２１を開いて中空成形
品を取り出した後の工程で、次の成形サイクルのために
金型を閉じる工程をいう。Here, the cooling step refers to after the injection of the molten resin is completed and before the die opening step of opening the die 21 is performed. The mold clamping step is a step after the mold 21 is opened and the hollow molded product is taken out, and the mold is closed for the next molding cycle.
【００２８】一般に、射出成形装置２において、その油
圧源３の油圧ポンプ１７に大きな負荷が加わるのは、型
締時と射出時である。即ち、型締時には金型２１を射出
圧力に対抗できる力で閉じるために大きな油圧を要し、
また射出時には溶融樹脂を金型キャビティ２２内の隅々
まで行きわたらせる圧力を得るために大きな油圧を要す
る。Generally, in the injection molding apparatus 2, a large load is applied to the hydraulic pump 17 of the hydraulic power source 3 during mold clamping and during injection. That is, a large hydraulic pressure is required to close the mold 21 with a force that can withstand the injection pressure during mold clamping,
In addition, a large hydraulic pressure is required at the time of injection in order to obtain a pressure that spreads the molten resin to every corner of the mold cavity 22.
【００２９】一方、上記型締工程及び射出工程を除き、
その他の工程中は高負荷の加わる作動がないので、油圧
源３の油圧ポンプ１７に余裕がある状態となる。従っ
て、この状態にある油圧源３を用いて油圧駆動式圧縮機
４を駆動することで、油圧源３に無理をかけることな
く、通常射出成形装置２に付随している油圧源３で充分
な圧力と量の加圧ガスを得ることができる。On the other hand, except for the mold clamping step and the injection step,
During the other steps, there is no operation under high load, so the hydraulic pump 17 of the hydraulic power source 3 has a margin. Therefore, by driving the hydraulic drive type compressor 4 by using the hydraulic power source 3 in this state, the hydraulic power source 3 normally associated with the injection molding apparatus 2 is sufficient without exerting a force on the hydraulic power source 3. A pressure and quantity of pressurized gas can be obtained.
【００３０】冷却工程移行後から型締工程移行までの間
に油圧駆動式圧縮機４を駆動するには、シーケンサー７
を、射出成形装置２が冷却工程へ移行した後型締工程へ
移行する前に圧力検知器６からの低下圧力信号を受けた
時に油圧供給弁開信号を油圧供給弁５ａへ発信するもの
とすることで行うことができる。In order to drive the hydraulically driven compressor 4 after the transition of the cooling process to the transition of the mold clamping process, a sequencer 7 is used.
Is transmitted to the hydraulic pressure supply valve 5a when the injection molding device 2 receives the lowered pressure signal from the pressure detector 6 before shifting to the mold clamping process after shifting to the cooling process. You can do that.
【００３１】更に具体的には、例えば、後述する加圧ガ
ス圧入許可信号が、射出すべき溶融樹脂の全量の射出完
了時もしくは完了後に発信される場合、シーケンサー７
が、この加圧ガス圧入許可信号を受信した後、後述する
型締許可信号を発信する前に低下圧力信号を受けた時
に、当該シーケンサー７によって油圧供給弁開信号を油
圧供給弁５ａへ発信し、その後シーケンサー７によって
型締許可信号を発信すると同時に油圧供給弁５ａへ油圧
供給弁閉信号を発信すればよい。More specifically, for example, when a pressurized gas injection permission signal described later is transmitted at or after the completion of injection of the entire amount of molten resin to be injected, the sequencer 7
However, after receiving the pressurization gas press-in permitting signal and when receiving the lowered pressure signal before transmitting the mold clamping permitting signal, which will be described later, the sequencer 7 transmits a hydraulic pressure supply valve open signal to the hydraulic pressure supply valve 5a. After that, the sequencer 7 may transmit the mold clamping permission signal and simultaneously transmit the hydraulic pressure supply valve closing signal to the hydraulic pressure supply valve 5a.
【００３２】前記射出許可信号を受信した射出成形装置
２の射出準備が整っている場合、その射出機２０が作動
して、金型２１の金型キャビティ２２内への溶融樹脂の
射出が行われる。但し、射出成形装置２の射出準備が整
っていない場合には、射出許可信号を受信しても溶融樹
脂の射出は行われない。When the injection molding device 2 which has received the injection permission signal is ready for injection, the injection machine 20 is operated and the molten resin is injected into the mold cavity 22 of the mold 21. . However, if the injection molding apparatus 2 is not ready for injection, the molten resin is not injected even if the injection permission signal is received.
【００３３】ここで射出準備が整うとは、金型２１の型
締及び金型２１への射出ノズル２３の圧接が完了し、い
つでも所定量の溶融樹脂を金型キャビティ２２内へ射出
できる状態にあることをいう。When the preparation for injection is completed, it means that the mold 21 is clamped and the injection nozzle 23 is pressed against the mold 21, and a predetermined amount of molten resin can be injected into the mold cavity 22 at any time. There is something.
【００３４】射出機２０が作動して金型キャビティ２２
内に溶融樹脂が射出されると、射出途中又は射出完了後
に射出成形装置２からシーケンサー７へ加圧ガス圧入許
可信号が発信される。この加圧ガス圧入許可信号の発信
のタイミングとしては、次の３つのタイミングがある。The injection machine 20 operates and the mold cavity 22
When the molten resin is injected therein, a pressurized gas injection permission signal is transmitted from the injection molding device 2 to the sequencer 7 during the injection or after the injection is completed. There are the following three timings for transmitting the pressurized gas injection permission signal.
【００３５】第１は、射出すべき溶融樹脂の全量を射出
し終った時点で発信するタイミング、第２は、射出すべ
き溶融樹脂の全量のうちの一部を射出し終った時点で発
信するタイミング、第３は、射出すべき溶融樹脂の全量
を射出し終ってから直ちに射出機２０のスクリューを所
定量サックバックさせてから発信するタイミングであ
る。The first is a timing of transmitting when the entire amount of the molten resin to be injected is finished, and the second is a timing of transmitting when a part of the total amount of the molten resin to be injected is finished. The third timing is the timing at which the screw of the injector 20 is sucked back by a predetermined amount immediately after the injection of the entire amount of the molten resin to be injected is finished and then transmitted.
【００３６】上記第１及び第２のタイミングでの加圧ガ
ス圧入許可信号の発信は、射出機２０内のスクリューが
所定量前進した時に当該信号を発信させることで行うこ
とができる。また、第３のタイミングでの加圧ガス圧入
許可信号の発信は、射出機２０内のスクリューが一旦前
進した後所定量サックバックした時に当該信号を発信さ
せることで行うことができる。The pressurized gas pressurization permission signal can be transmitted at the first and second timings by transmitting the signal when the screw in the injector 20 advances by a predetermined amount. The pressurized gas press-fitting permission signal can be transmitted at the third timing by transmitting the signal when the screw in the injector 20 once advances and then sucks back a predetermined amount.
【００３７】上記いずれのタイミングの場合でも、スク
リューが所定の一定位置に来た時に加圧ガス圧入信号が
発信されるので、加圧ガス圧入のタイミングが一定し、
得られる中空成形品にばらつきを生じにくい。In any of the above timings, since the pressurized gas press-in signal is transmitted when the screw reaches a predetermined fixed position, the pressurized gas press-in timing becomes constant,
Variations are less likely to occur in the obtained hollow molded product.
【００３８】第１〜第３のいずれのタイミングで加圧ガ
ス圧入許可信号を発信するかは、射出成形装置２に選択
スイッチを設け、その切り換えで選択できるようにして
おき、シーケンサー７へは同じ加圧ガス圧入許可信号１
本で発信することが好ましい。Which of the first to third timings the pressurized gas press-fitting permission signal is transmitted is provided with a selection switch in the injection molding device 2 so that the selection can be made by switching the same, and the sequencer 7 is the same. Pressurized gas injection permission signal 1
It is preferable to send in a book.
【００３９】シーケンサー７が加圧ガス圧入信号を受信
すると、シーケンサー７からガス圧入弁２４にガス圧入
弁開信号が発信され、ガス圧入弁２４が開放されて加圧
ガスが金型キャビティ２２内の溶融樹脂中に圧入され、
中空部が形成される。この加圧ガスの圧入は、射出ノズ
ル２３に内蔵されたガスノズル（図示されていない）又
は金型２１の所定位置に取り付けたガスノズル（図示さ
れていない）を介して行われる。When the sequencer 7 receives the pressurized gas press-in signal, the sequencer 7 sends a gas press-in valve opening signal to the gas press-in valve 24, and the gas press-in valve 24 is opened so that the pressurized gas in the mold cavity 22 is released. Pressed into molten resin,
A hollow portion is formed. The pressurization of the pressurized gas is performed via a gas nozzle (not shown) built in the injection nozzle 23 or a gas nozzle (not shown) attached to a predetermined position of the mold 21.
【００４０】また、加圧ガスの圧入は、シーケンサー７
が加圧ガス圧入信号を受信してから直ちに行ってもよい
が遅延タイマーを作動させて、シーケンサー７が加圧ガ
ス圧入許可信号を受信してから０．１〜１０秒後に開始
されるようにすることが好ましい。The pressurization of the pressurized gas is performed by the sequencer 7
May be performed immediately after the pressurization gas press-in signal is received, but the delay timer is activated so that the sequencer 7 starts 0.1 to 10 seconds after receiving the pressurization gas press-in permission signal. Preferably.
【００４１】ガス圧入弁２４は所定時間開放され、当該
時間が経過すると、シーケンサー７からガス圧入弁２４
にガス圧入弁閉信号が発信され、ガス圧入弁２４が閉鎖
されて、そのままの状態を維持して保圧時間に入る。こ
のガス圧入弁２４の開放時間は、形成すべき中空部の大
きさ等に応じて定めればよい。The gas press-in valve 24 is opened for a predetermined time, and when the time elapses, the gas press-in valve 24 is released from the sequencer 7.
A gas press-in valve closing signal is transmitted to the gas press-in valve, the gas press-in valve 24 is closed, and the same state is maintained to enter the pressure holding time. The opening time of the gas injection valve 24 may be determined according to the size of the hollow portion to be formed and the like.
【００４２】ガス圧入弁２４を閉鎖した後の保圧時間
は、中空部を充分押し広げると共に、中空成形品の型再
現性を向上させるためのもので、中空成形品の大きさや
形状等によっても相違するが、通常５〜６０秒程度が好
ましい。The pressure holding time after closing the gas injection valve 24 is for sufficiently expanding the hollow portion and for improving the mold reproducibility of the hollow molded product. It depends on the size and shape of the hollow molded product. Although different, usually about 5 to 60 seconds is preferable.
【００４３】上記保圧時間が経過した後、形成された中
空部内の加圧ガスの排出が行われる。After the pressure holding time has elapsed, the pressurized gas in the formed hollow portion is discharged.
【００４４】この加圧ガスの排出は、射出機２０を後退
させて金型２１から射出ノズル２３を離すことで行うこ
ともできるが、中空部内の窒素ガス等の加圧ガスが大気
に放出されて無駄になると共に、中空部内の加圧ガスが
一気に吹き出すので、次のようにして行うことが好まし
い。The pressurized gas can be discharged by retracting the injector 20 and separating the injection nozzle 23 from the mold 21, but the pressurized gas such as nitrogen gas in the hollow portion is released to the atmosphere. Since it is wasted and the pressurized gas in the hollow portion is blown out at once, it is preferable to carry out as follows.
【００４５】まず、保圧時間が経過した時に、シーケン
サー７から回収弁開信号を回収弁２５へ発信し、これに
よって回収弁２５を開放する。すると、前述のように回
収タンク１０内の圧力が比較的低圧に押えられているの
で、中空部内の加圧ガスは、射出ノズル２３を介して回
収タンク１０へと逆流し、回収される。First, when the pressure holding time has elapsed, the sequencer 7 sends a recovery valve open signal to the recovery valve 25, thereby opening the recovery valve 25. Then, as described above, the pressure in the recovery tank 10 is suppressed to a relatively low pressure, so the pressurized gas in the hollow portion flows back to the recovery tank 10 via the injection nozzle 23 and is recovered.
【００４６】回収弁２５を開放しておく時間は、中空部
の大きさ等によっても相違するが、通常１〜数秒程度で
充分である。The time for which the recovery valve 25 is kept open varies depending on the size of the hollow portion and the like, but is usually about 1 to several seconds.
【００４７】所定時間上記回収弁２５を開放した後、シ
ーケンサー７から回収弁閉信号を発信して回収弁２５を
閉鎖し、次いでシーケンサー７から大気開放弁２６へ大
気開放弁開信号を発信して大気開放弁２６を開放する。After the recovery valve 25 is opened for a predetermined time, the recovery valve closing signal is transmitted from the sequencer 7 to close the recovery valve 25, and then the atmosphere opening valve opening signal is transmitted from the sequencer 7 to the atmosphere opening valve 26. The atmosphere release valve 26 is opened.
【００４８】この大気開放弁２６の開放は、回収弁２５
を開放しても、回収タンク１０内と中空部内の圧力が平
衡状態になることで中空部内に加圧ガスが残留するの
で、この残留加圧ガスを大気へ放出して、中空部内の圧
力を大気圧まで下げるためのものである。The opening of the atmosphere opening valve 26 is performed by the recovery valve 25.
Even if the pressure is released, the pressure in the recovery tank 10 and the pressure in the hollow portion are in equilibrium, so that the pressurized gas remains in the hollow portion. Therefore, the residual pressurized gas is released to the atmosphere to reduce the pressure in the hollow portion. It is for lowering to atmospheric pressure.
【００４９】上記大気開放弁２６の開放を所定時間行っ
た後、シーケンサー７から射出成形装置２へ型開許可信
号を発信し、冷却時間が経過していれば金型２１が開放
されて中空成形品の取り出しが行われる。この型開許可
信号を受信した時に冷却時間が経過していない時には、
冷却時間の経過を待って金型２１の開放が行われる。After opening the atmosphere release valve 26 for a predetermined time, the sequencer 7 sends a mold opening permission signal to the injection molding apparatus 2, and if the cooling time has elapsed, the mold 21 is opened to perform hollow molding. The product is taken out. When the cooling time has not elapsed when this mold opening permission signal is received,
The mold 21 is opened after the elapse of the cooling time.
【００５０】上記金型２１の開放は、大気開放弁２６の
開放後、シーケンサー７から大気開放弁２６に大気開放
弁閉信号を発信して大気開放弁２６を閉じてから行って
もよいが、大気開放弁２６を開放したまま金型２１の開
放を行い、金型２１の開放後に上記大気開放弁２６の閉
鎖を行ってもよい。The mold 21 may be opened after the atmosphere release valve 26 is opened, and then the sequencer 7 sends an atmosphere release valve closing signal to the atmosphere release valve 26 to close the atmosphere release valve 26. The mold 21 may be opened with the atmosphere release valve 26 open, and the atmosphere release valve 26 may be closed after the mold 21 is opened.
【００５１】ところで、射出ノズル２３に内蔵されてい
るガスノズル（図示されていない）には、溶融樹脂のガ
スノズルへの逆流を防止するための逆止弁が設けられて
いる場合がある。この逆止弁が介在されている場合に
は、中空部内の加圧ガスの回収に当り、上述のように回
収弁２５を開放するだけでは、この逆止弁に妨げられ
て、中空部内の加圧ガスを回収することができない。By the way, a gas nozzle (not shown) built in the injection nozzle 23 may be provided with a check valve for preventing the reverse flow of the molten resin to the gas nozzle. When the check valve is interposed, the pressurized gas in the hollow portion is recovered, and the recovery valve 25 is simply opened as described above to prevent the check valve from interfering with the check valve so that the pressure in the hollow portion is increased. Unable to recover pressurized gas.
【００５２】上記逆止弁が存在する場合、当該逆止弁を
強制的に開放するか、逆止弁を迂回するバイパス路を開
放して、中空部内の加圧ガスが射出ノズル２３を介して
回収タンク１０へ流入できるようにする必要がある。When the check valve is present, the check valve is forcibly opened, or the bypass passage bypassing the check valve is opened so that the pressurized gas in the hollow portion passes through the injection nozzle 23. It is necessary to be able to flow into the recovery tank 10.
【００５３】従って、この場合には、回収弁２５の開放
後に、逆止弁又はバイパス路開放信号をシーケンサー７
から射出成形装置２へ発信し、逆止弁の介在に拘らず、
回収弁２５の開放によって中空部内の加圧ガスが回収タ
ンク１０へ流出できるようにすることで加圧ガスの回収
を行い、以後は同様にすればよい。Therefore, in this case, after the recovery valve 25 is opened, the check valve or bypass opening signal is sent to the sequencer 7.
From the injection molding device 2 to the injection molding device 2, regardless of the presence of the check valve,
The pressurized gas in the hollow portion is allowed to flow out to the recovery tank 10 by opening the recovery valve 25, thereby recovering the pressurized gas, and the same process may be performed thereafter.
【００５４】上記のようにして金型２１を開放して中空
成形品を取り出した後は、大気開放弁２６や上記逆止弁
又はバイパス路が開放されている時にはこれを閉鎖し、
更にシーケンサー７からの型閉許可信号に基づいて、次
の成形サイクルのために金型２１を閉鎖して型締する型
締工程へと移行する。After the mold 21 is opened and the hollow molded article is taken out as described above, the atmosphere release valve 26, the check valve or the bypass passage is closed when it is opened,
Further, based on the mold closing permission signal from the sequencer 7, the mold 21 is closed for the next molding cycle and the mold clamping process is started.
【００５５】[0055]
【発明の効果】本発明は、以上説明した通りのものであ
り、元々射出成形装置２に付随している油圧源３を用い
て、中空成形に必要な圧力と量の加圧ガスを得ることが
でき、加圧ガスを得るための新たな油圧源３を必要とし
ないので、設備的負担が軽減されると共に、既存の設備
を用いた中空射出成形の実施が容易となるものである。The present invention is as described above, and obtains a pressurized gas of a pressure and an amount necessary for hollow molding by using the hydraulic pressure source 3 originally attached to the injection molding apparatus 2. Since the new hydraulic pressure source 3 for obtaining the pressurized gas is not required, the facility load is reduced and the hollow injection molding using the existing facility is facilitated.
【図１】本発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
【図２】油圧源の説明図である。FIG. 2 is an explanatory diagram of a hydraulic pressure source.
【符号の説明】 １ 高圧タンク ２ 射出成形装置 ３ 油圧源 ４ 油圧駆動式圧縮機 ５ａ，５ｂ 油圧供給弁 ６ 圧力検知器 ７ シーケンサー ８ ガス源 ９ 減圧弁 １０ 回収タンク １１ 低圧シリンダー １２ 高圧シリンダー １３ 油圧駆動シリンダー １４ 自動切り換え弁 １５ａ〜１５ｅ 逆止弁 １６ 油タンク １７ 油圧ポンプ １８ リリーフ弁 １９ アキュームレーター ２０ 射出機 ２１ 金型 ２２ 金型キャビティ ２３ 射出ノズル ２４ 圧入弁 ２５ 回収弁 ２６ 大気開放弁[Explanation of Codes] 1 high pressure tank 2 injection molding device 3 hydraulic power source 4 hydraulic drive type compressor 5a, 5b hydraulic pressure supply valve 6 pressure detector 7 sequencer 8 gas source 9 pressure reducing valve 10 recovery tank 11 low pressure cylinder 12 high pressure cylinder 13 hydraulic pressure Drive cylinder 14 Automatic switching valve 15a to 15e Check valve 16 Oil tank 17 Hydraulic pump 18 Relief valve 19 Accumulator 20 Injection machine 21 Mold 22 Mold cavity 23 Injection nozzle 24 Press-fitting valve 25 Recovery valve 26 Atmosphere release valve
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 49/78 7619−4Ｆ // Ｂ２９Ｌ 22:00 4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location B29C 49/78 7619-4F // B29L 22:00 4F
Claims (4)
油圧駆動式圧縮機によって高圧タンク内に蓄えられた加
圧ガスの金型キャビティへの圧入とを行う中空射出成形
方法において、高圧タンク内の昇圧を、射出成形装置の
油圧源で油圧駆動式圧縮機を駆動することで行うことを
特徴とする中空射出成形方法。1. Injection of molten resin into a mold cavity,
In the hollow injection molding method in which the pressurized gas stored in the high-pressure tank is pressed into the mold cavity by the hydraulic drive compressor, the pressure increase in the high-pressure tank is hydraulically driven by the hydraulic source of the injection molding device. A hollow injection molding method characterized by being performed by driving a machine.
圧縮機の駆動を、射出成形装置における冷却工程移行後
から次の成形サイクルのための型締工程移行までの間に
行うことを特徴とする請求項１の中空射出成形方法。2. The hydraulic drive type compressor is driven by the hydraulic pressure source of the injection molding device between the transition of the cooling process of the injection molding device and the transition of the mold clamping process for the next molding cycle. The hollow injection molding method according to claim 1.
油圧駆動式圧縮機によって高圧タンク内に蓄えられた加
圧ガスの金型キャビティへの圧入とを行う中空射出成形
装置において、油圧供給弁を介して射出成形装置の油圧
源に接続された油圧駆動式圧縮機と、高圧タンク内の圧
力を検知し、高圧タンク内の圧力が所定の下限圧力以下
になった時に低下圧力信号を発する圧力検知器と、圧力
検知器からの低下圧力信号を受信した時に、油圧供給弁
開信号を油圧供給弁へ発信して、射出成形装置の油圧源
からの油圧を油圧駆動式圧縮機へ供給するシーケンサー
とを有することを特徴とする中空射出成形装置。3. Injection of molten resin into a mold cavity,
In a hollow injection molding machine that uses a hydraulically driven compressor to pressurize the pressurized gas stored in a high-pressure tank into a mold cavity, a hydraulic drive that is connected to a hydraulic source of the injection molding machine via a hydraulic pressure supply valve. -Type compressor, a pressure detector that detects the pressure in the high-pressure tank and issues a reduced pressure signal when the pressure in the high-pressure tank falls below a predetermined lower limit pressure, and a reduced pressure signal from the pressure detector is received. A hollow injection molding apparatus, characterized in that the hollow injection molding apparatus further comprises a sequencer that transmits a hydraulic pressure supply valve open signal to the hydraulic pressure supply valve to supply the hydraulic pressure from the hydraulic pressure source of the injection molding apparatus to the hydraulically driven compressor.
程移行後から型締工程移行までの間に低下圧力信号を受
信した時に油圧供給弁へ油圧供給弁開信号を発信するも
のであることを特徴とする請求項３の中空射出成形装
置。4. The sequencer sends a hydraulic pressure supply valve open signal to the hydraulic pressure supply valve when the injection molding device receives a reduced pressure signal between after the cooling process and before the mold clamping process. The hollow injection molding apparatus according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12470593A JPH06312431A (en) | 1993-04-30 | 1993-04-30 | Method and apparatus for hollow injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12470593A JPH06312431A (en) | 1993-04-30 | 1993-04-30 | Method and apparatus for hollow injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06312431A true JPH06312431A (en) | 1994-11-08 |
Family
ID=14892064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12470593A Withdrawn JPH06312431A (en) | 1993-04-30 | 1993-04-30 | Method and apparatus for hollow injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06312431A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519724A (en) * | 2021-07-28 | 2022-12-27 | 宁波佰氏微泡注塑科技有限公司 | Microbubble device of moulding plastics with clout is retrieved |
-
1993
- 1993-04-30 JP JP12470593A patent/JPH06312431A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519724A (en) * | 2021-07-28 | 2022-12-27 | 宁波佰氏微泡注塑科技有限公司 | Microbubble device of moulding plastics with clout is retrieved |
| CN115519724B (en) * | 2021-07-28 | 2024-05-07 | 宁波佰氏微泡注塑科技有限公司 | Microbubble injection molding device with clout is retrieved |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0720637B2 (en) | Injection molding method and apparatus for hollow molded article | |
| EP0317176A2 (en) | Method for injection molding, apparatus therefor and moldings produced thereby | |
| JP3569172B2 (en) | Hydraulic system for tire vulcanizing press | |
| US5112563A (en) | Process of injection molding with pressurized gas assist | |
| JPH06312431A (en) | Method and apparatus for hollow injection molding | |
| US20040099400A1 (en) | Diecasting machine | |
| JPH09117931A (en) | Resin encapsulating method and device of electronic part | |
| JPH091600A (en) | Injection molding method | |
| JPH08197563A (en) | Injection molding machine | |
| JPH09314391A (en) | Method for reducing pressure of cold isotropic pressurizing device and device therefor | |
| JPH06210652A (en) | Hollow injection molding method | |
| JP3235126B2 (en) | High-pressure gas generation and recovery method | |
| JPH10189630A (en) | Method of molding and resin-sealing electronic component | |
| JP2002301560A (en) | Gas filling device of accumulator, and injection device | |
| JP3197473B2 (en) | Dry isostatic pressing apparatus and dry isostatic pressing method | |
| JP3255831B2 (en) | Gas supply device in injection molding machine for gas injection molding | |
| JPH0732404A (en) | Gas recovery method in gas assist injection molding and gas assist injection molding machine therefor | |
| JP3319899B2 (en) | Decompression method and apparatus in cold isostatic pressurizing apparatus | |
| JP3279446B2 (en) | Injection molding machine | |
| JP2838670B2 (en) | Injection molding method and injection molding machine used therefor | |
| JPH06328462A (en) | Method and apparatus for raising pressure of clamping cylinder of tire vulcanizer | |
| JP2599063Y2 (en) | Injection molding machine pressurization completion control device | |
| JPH06285897A (en) | Gas-assistant injection molding method | |
| JP3007850B2 (en) | Resin molding method and resin molding apparatus | |
| JP3517769B2 (en) | Gas supply system for injection molding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000704 |