JPH0664002A - Injection molding method and injection molding equipment - Google Patents
Injection molding method and injection molding equipmentInfo
- Publication number
- JPH0664002A JPH0664002A JP22583892A JP22583892A JPH0664002A JP H0664002 A JPH0664002 A JP H0664002A JP 22583892 A JP22583892 A JP 22583892A JP 22583892 A JP22583892 A JP 22583892A JP H0664002 A JPH0664002 A JP H0664002A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- injection
- order
- injected
- cavity
- 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.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 282
- 229920005989 resin Polymers 0.000 claims abstract description 282
- 238000002347 injection Methods 0.000 claims description 149
- 239000007924 injection Substances 0.000 claims description 149
- 230000007423 decrease Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 description 21
- 239000003921 oil Substances 0.000 description 21
- 239000010720 hydraulic oil Substances 0.000 description 12
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、樹脂製品の射出成形方
法及び射出成形装置に関し、特に自動車のバンパー等、
比較的薄肉で大型な樹脂製品の射出成形に適した射出成
形方法及び射出成形装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method and an injection molding apparatus for resin products, and more particularly to automobile bumpers and the like.
The present invention relates to an injection molding method and an injection molding apparatus suitable for injection molding a relatively thin and large resin product.
【０００２】[0002]
【従来の技術】一般に、自動車のバンパー等、比較的薄
肉で大型な樹脂製品を射出成形により成形する場合に
は、その製品形状に対応して金型に設けたキャビティに
複数の樹脂注入部（ゲート）から溶融樹脂を射出注入す
るようにしている。2. Description of the Related Art Generally, when molding a relatively thin and large resin product such as an automobile bumper by injection molding, a plurality of resin injection parts ( The molten resin is injected and injected from the gate).
【０００３】この場合、複数のゲートから一度に溶融樹
脂を射出注入するようにすると、例えば図４（ａ）に示
すように、各ゲートａから注入された溶融樹脂ｂの流頭
同志がキャビティｃ内でその圧力及び温度が多少低下し
た状態で接触することにより、これらの融合が不完全な
ものとなって、その接触箇所にウェルドマークｄが発生
し易いという不都合がある。In this case, if the molten resin is injected and injected at a time from a plurality of gates, for example, as shown in FIG. 4A, the flow heads of the molten resin b injected from the respective gates a are cavities c. When they come into contact with each other in a state where the pressure and the temperature are slightly lowered, the fusion of these is incomplete, and the weld mark d is apt to be generated at the contact portion.
【０００４】このため、このようなウェルドマークの発
生を防止し得る射出成形技術として、例えば特開昭５７
−４５０３９号公報や特開昭６３−２３７９２０号公報
に開示されているものが提案されている。Therefore, as an injection molding technique capable of preventing the occurrence of such weld marks, for example, Japanese Patent Application Laid-Open No. 57-57.
The ones disclosed in JP-A-45039 and JP-A-63-237920 have been proposed.
【０００５】これらの公報に開示されている射出成形技
術においては、まず、複数のゲートのうち、一つのゲー
ト（第１順位のゲート）を除くゲートをバルブにより閉
じた状態で、該第１順位のキャビティ内に溶融樹脂の射
出注入を開始し、その溶融樹脂の流頭が第１順位のゲー
トの隣に位置する第２順位のゲートの箇所に達した後
に、該第２順位のゲートを開放して該第２順位のゲート
からの溶融樹脂の射出注入を開始する、というようにし
て、各ゲートからの溶融樹脂の射出注入をあらかじめ定
めた所定の順位に従って適当な時間間隔をおいて行うよ
うにしている。そして、このようにすることにより、各
ゲートからの溶融樹脂が円滑に融合するようにし、ウェ
ルドマークの発生を防止するようにしている。In the injection molding techniques disclosed in these publications, first, among a plurality of gates, except for one gate (first-order gate), the first-order gate is closed with a valve. The injection of the molten resin is started into the cavity of the second resin, and after the flow front of the molten resin reaches the position of the second-order gate located next to the first-order gate, the second-order gate is opened. Then, the injection and injection of the molten resin from the second-order gate is started, and the injection and injection of the molten resin from each gate is performed at an appropriate time interval in accordance with a predetermined order. I have to. Then, by doing so, the molten resin from each gate is smoothly fused and the generation of the weld mark is prevented.
【０００６】しかしながら、かかる射出成形技術におい
ては、特に第２順位以降の順位のゲートの近傍箇所に所
謂、フローマークを生じやすいという不都合があった。However, such an injection molding technique has a disadvantage that so-called flow marks are likely to be generated particularly in the vicinity of the gates of the second and subsequent ranks.
【０００７】この原因は次のように考えられる。すなわ
ち、上記の射出成形技術においては、各ゲートに連通す
る同一の樹脂供給路から複数のゲートに溶融樹脂を分配
・供給するようにしているため、例えば、第１順位のゲ
ートに樹脂供給路から溶融樹脂を供給しつつ、該ゲート
からキャビティに溶融樹脂を射出注入している状態にお
いて、第２順位のゲートを開放すると、その瞬間に今ま
で第１順位のゲートのみ介してキャビティに射出注入さ
れていた溶融樹脂が急激に第２順位のゲートをも介して
キャビティに射出注入されるようになり、このため、第
１順位のゲートからキャビティに射出注入される溶融樹
脂量は急激に減少する。このため、第１順位のゲートか
らキャビティに射出注入されていた溶融樹脂の流頭は、
その流速が一時的に急減し、次いで、第２順位のゲート
からの射出注入により、再びその流速を上昇させてキャ
ビティ内を流動していく。そして、上記のようにキャビ
ティ内を流動している溶融樹脂の流頭の流速が急激に遅
くなると、その後に再び流速が上昇しても、その流速が
遅くなった瞬間に溶融樹脂の流頭が金型との接触により
瞬間的に冷却されてキャビティの内壁に付着し、これが
最終的に得られる樹脂製品にフローマークとなって現れ
ると考えられる。The cause is considered as follows. That is, in the above-mentioned injection molding technique, since the molten resin is distributed and supplied to the plurality of gates from the same resin supply path communicating with each gate, for example, the resin supply path is provided to the first-order gates. While the molten resin is being supplied and the molten resin is being injected from the gate into the cavity, when the second-order gate is opened, it is injected and injected into the cavity at that moment only through the first-order gate. The molten resin that has been used is suddenly injected and injected into the cavity also via the second-order gate, so that the amount of molten resin injected and injected from the first-order gate into the cavity is rapidly reduced. Therefore, the flow front of the molten resin injected and injected from the first-order gate into the cavity is
The flow velocity is suddenly reduced rapidly, and then the flow is increased again to flow in the cavity by injection injection from the second-ranked gate. When the flow velocity of the molten resin flowing in the cavity is rapidly decreased as described above, even if the flow velocity is increased again after that, the molten resin flows at the moment when the flow velocity becomes low. It is considered that the resin is instantaneously cooled by contact with the mold and adheres to the inner wall of the cavity, and this appears as a flow mark in the finally obtained resin product.
【０００８】具体的には、図４（ｂ）において、キャビ
ティｅに溶融樹脂ｆを射出注入すべく設けた３個のゲー
トｇ1 〜ｇ3 に同一の樹脂供給路ｈから溶融樹脂ｆを分
配・供給するように構成すると共に、まず、中央のゲー
トｇ1 のみから溶融樹脂ｆの射出注入を開始し、次い
で、該溶融樹脂ｆが同図仮想線ｉで示すように両側のゲ
ートｇ2 ，ｇ3 の位置に達した時にこれらのゲート
ｇ2 ，ｇ3 から溶融樹脂ｆの射出注入を開始するように
すると、前記仮想線ｉに沿ってフローマークｊが生じ
る。Specifically, in FIG. 4B, the molten resin f is distributed from the same resin supply passage h to the three gates g 1 to g 3 provided to inject and inject the molten resin f into the cavity e. In addition to the supply, first, the injection injection of the molten resin f is started only from the central gate g 1 , and then the molten resin f is supplied to the gates g 2 on both sides as shown by the phantom line i in FIG. When the injection injection of the molten resin f is started from these gates g 2 and g 3 when the position of g 3 is reached, a flow mark j is generated along the virtual line i.
【０００９】[0009]
【発明が解決しようとする課題】本発明はかかる不都合
を解消し、比較的大型で薄肉の樹脂製品を、ウェルドマ
ークやフローマークを生じることなく、高品質なものと
して成形することができる射出成形方法及び射出成形装
置を提供することを目的とする。The present invention solves such inconveniences and makes it possible to mold a relatively large and thin resin product with high quality without forming weld marks or flow marks. It is an object to provide a method and an injection molding device.
【００１０】[0010]
【課題を解決するための手段】本発明の射出成形方法
は、かかる目的を達成するために、あらかじめ注入順位
を定めた複数の樹脂注入部から溶融樹脂を射出注入可能
に金型に設けられたキャビティと前記複数の樹脂注入部
を連通して設けられた樹脂供給路とを備えた射出成形装
置を用い、前記樹脂供給路から前記複数の樹脂注入部に
溶融樹脂を分配・供給すると共に、該溶融樹脂を前記複
数の樹脂注入部からその注入順位に従って前記キャビテ
ィに射出注入することにより樹脂製品を射出成形する方
法において、前記複数の樹脂注入部のうち、第２順位以
降の後順位の樹脂注入部から前記キャビティに溶融樹脂
を射出注入する際に、当該後順位に先行する先行順位の
樹脂注入部から前記キャビティに射出注入された溶融樹
脂の流頭が当該後順位の樹脂注入部の位置に達した後
に、当該後順位の樹脂注入部を開閉自在に設けた開閉弁
を開放して当該後順位の樹脂注入部から前記キャビティ
への溶融樹脂の射出注入を開始せしめ、この時、前記樹
脂供給路から前記先行順位の樹脂注入部を介して前記キ
ャビティに射出注入されている溶融樹脂量の急激な低下
を抑制すべく前記開閉弁を徐々に開放して、前記第２の
樹脂注入部から前記キャビティに射出注入される溶融樹
脂量を徐々に増加させることを特徴とする。In order to achieve such an object, the injection molding method of the present invention is provided in a mold so that a molten resin can be injected and injected from a plurality of resin injection parts whose injection orders are predetermined. While using an injection molding apparatus having a cavity and a resin supply path provided so as to communicate the plurality of resin injection parts, the molten resin is distributed and supplied from the resin supply path to the plurality of resin injection parts, and In a method of injection molding a resin product by injecting a molten resin from the plurality of resin injecting parts into the cavity according to the injection order, in the plurality of resin injecting parts, a resin injection of a second order or a later order. When the molten resin is injected into the cavity from the above section, the flow front of the molten resin injected into the cavity from the preceding-order resin injection section preceding the latter order is After reaching the position of the resin injecting part of, the opening / closing valve provided to open and close the resin injecting part of the rear rank is opened to start injection injection of the molten resin from the resin injecting part of the rear rank into the cavity. At this time, the on-off valve is gradually opened to suppress a sharp decrease in the amount of molten resin injected and injected from the resin supply path into the cavity through the resin injection portion of the preceding order, and It is characterized in that the amount of molten resin injected and injected from the second resin injection portion into the cavity is gradually increased.
【００１１】また、本発明の射出成形装置は、前記の目
的を達成するために、あらかじめ注入順位を定めた複数
の樹脂注入部から溶融樹脂を射出注入可能に金型に設け
られたキャビティと、前記複数の樹脂注入部を連通して
設けられた樹脂供給路を介して前記複数の樹脂注入部に
溶融樹脂を分配・供給する樹脂供給手段と、前記複数の
樹脂注入部のうち、少なくとも第２順位以降の注入順位
の樹脂注入部を各々開閉自在に設けられた開閉弁と、前
記各樹脂注入部に供給された溶融樹脂を前記注入順位に
従って前記各樹脂注入部から前記キャビティに射出注入
すべく前記開閉弁を所定のタイミングで開放せしめる開
閉弁駆動手段とを備え、該開閉弁駆動手段は、前記複数
の樹脂注入部のうち、先行順位の樹脂注入部から射出注
入された溶融樹脂の流頭が次順位の樹脂注入部の位置に
達した後に、該次順位の樹脂注入部に対応する前記開閉
弁を開放せしめると共に、前記樹脂供給路から前記先行
順位の樹脂注入部を介して前記キャビティに射出注入さ
れている溶融樹脂量の急激な低下を抑制すべく前記次順
位の樹脂注入部に対応する前記開閉弁を徐々に開放せし
めることを特徴とする。Further, in order to achieve the above-mentioned object, the injection molding apparatus of the present invention comprises a cavity provided in the mold so that the molten resin can be injected and injected from a plurality of resin injection parts having predetermined injection orders, At least a second of the resin supply means for distributing and supplying the molten resin to the plurality of resin injecting parts via the resin supply path provided so as to communicate with the plurality of resin injecting parts, and the plurality of resin injecting parts. An on-off valve that is provided to open and close each resin injection part of the injection order after the order, and to inject the molten resin supplied to each resin injection part into the cavity from each resin injection part according to the injection order. An opening / closing valve drive means for opening the opening / closing valve at a predetermined timing, wherein the opening / closing valve drive means is a molten resin injected and injected from a resin injection portion of the preceding order among the plurality of resin injection portions. After the flow head reaches the position of the resin injection part of the next order, the on-off valve corresponding to the resin injection part of the next order is opened, and at the same time, from the resin supply passage through the resin injection part of the preceding order. It is characterized in that the on-off valve corresponding to the resin injection portion of the next order is gradually opened in order to suppress a rapid decrease in the amount of molten resin injected and injected into the cavity.
【００１２】[0012]
【作用】本発明の射出成形方法によれば、前記樹脂供給
路から前記複数の樹脂注入部に溶融樹脂を分配・供給す
ると共に、該溶融樹脂を前記複数の樹脂注入部からその
注入順位に従って前記キャビティに射出注入し、この
時、前記後順位の樹脂注入部からの溶融樹脂の射出注入
を、前記先行順位の樹脂注入部から射出注入された溶融
樹脂の流頭が該後順位の樹脂注入部の位置に達した後に
行うことにより、樹脂製品にウェルドマークが生じるの
が防止される。そして、さらに、前記後順位の樹脂注入
部からの射出注入を開始すべく前記開閉弁を開放する際
に、その開放を徐々に行うことにより、前記樹脂供給路
から前記先行順位の樹脂注入部を介して前記キャビティ
に射出注入される溶融樹脂量が急激に減少するのが抑制
され、前記先行順位の樹脂注入部から射出注入された溶
融樹脂の流頭の流速が急激に低下するのが防止される。
これにより、樹脂製品にフローマークが生じるのが防止
される。According to the injection molding method of the present invention, the molten resin is distributed and supplied from the resin supply path to the plurality of resin injecting portions, and the molten resin is supplied from the plurality of resin injecting portions according to the injection order. Injection injection into the cavity, at this time, the injection injection of the molten resin from the resin injection section of the rear rank is performed, and the flow front of the molten resin injected from the resin injection section of the preceding rank is the resin injection section of the latter rank. By performing the process after reaching the position, the weld mark is prevented from being formed on the resin product. Further, when the on-off valve is opened to start injection injection from the resin injection section of the lower order, the opening is gradually performed so that the resin injection section of the preceding order is opened from the resin supply passage. It is suppressed that the amount of molten resin injected and injected into the cavity via the abrupt decrease is suppressed, and the flow velocity of the flow front of the molten resin injected and injected from the resin injection part of the preceding order is prevented from abruptly decreasing. It
This prevents the flow mark from being generated in the resin product.
【００１３】また、本発明の射出成形装置によれば、射
出成形の際に、前記樹脂供給手段により前記樹脂供給路
を介して前記複数の樹脂注入部に溶融樹脂が分配・供給
されると共に、前記開閉弁駆動手段が前記開閉弁の所定
の順番で開放せしめることにより、各樹脂注入部に分配
・供給された溶融樹脂が各樹脂注入部から所定の注入順
位に従って前記キャビティに射出注入される。この時、
該開閉弁駆動手段が、前記先行順位の樹脂注入部から射
出注入された溶融樹脂の流頭が次順位の樹脂注入部の位
置に達した後に、該次順位の樹脂注入部に対応する前記
開閉弁を開放せしめると共に、その開放を徐々に行うこ
とにより、前述の場合と同様に樹脂製品にウェルドマー
クやフローマークが生じるのが防止される。Further, according to the injection molding apparatus of the present invention, at the time of injection molding, the molten resin is distributed / supplied to the plurality of resin injecting parts by the resin supply means through the resin supply passage, By opening and closing the on-off valves in a predetermined order by the on-off valve driving means, the molten resin distributed and supplied to each resin injecting section is injected and injected from each resin injecting section into the cavity according to a predetermined injection order. At this time,
The on-off valve drive means opens and closes the corresponding resin injection part of the next order after the flow front of the molten resin injected and injected from the resin injection part of the preceding order reaches the position of the resin injection part of the next order. By opening the valve and gradually opening the valve, it is possible to prevent weld marks and flow marks from being formed in the resin product as in the case described above.
【００１４】[0014]
【実施例】本発明の一例を図１乃至図３に従って説明す
る。図１は射出成形装置のシステム構成図、図２は図１
のＩＩ−ＩＩ線断面図、図３は図１の射出成形装置によ
る射出成形方法を説明するための説明図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described with reference to FIGS. 1 is a system configuration diagram of an injection molding apparatus, and FIG. 2 is FIG.
II-II line sectional view of FIG. 3, and FIG. 3 is an explanatory view for explaining an injection molding method by the injection molding apparatus of FIG. 1.
【００１５】図１及び図２で、１は上型１ａと下型１ｂ
とからなる金型、２は上型１ａと下型１ｂとの間に形成
されたキャビティ、３はキャビティ２に溶融樹脂Ａを射
出注入すべく上型１ａに設けられた複数（本実施例では
３個）の樹脂注入部、４は上型１ａに形成されたホット
ランナー（樹脂供給路）５を介して各樹脂注入部３に溶
融樹脂Ａを供給する樹脂供給手段である。In FIGS. 1 and 2, reference numeral 1 designates an upper mold 1a and a lower mold 1b.
And 2 are cavities formed between the upper mold 1a and the lower mold 1b, and 3 are a plurality of cavities (in the present embodiment, provided in the upper mold 1a for injecting the molten resin A into the cavities 2). Three (3) resin injection parts 4 are resin supply means for supplying the molten resin A to each resin injection part 3 via a hot runner (resin supply path) 5 formed in the upper mold 1a.
【００１６】この場合、本実施例の射出成形装置は、例
えば平板状の樹脂製品Ｗ（図３（ｃ）参照）を成形する
ためのものであり、これに対応してキャビティ２も平板
状に形成されている。また、上型１ａと下型１ｂとの間
には、図２及び図３に示すようにキャビティ２の一側縁
部に沿って延在するランナー部６が形成されており、こ
のランナー部６はキャビティ２の一側縁部にフィルムゲ
ート７を介して連通されている。そして、前記樹脂注入
部３は、ランナー部６にその長手方向に間隔を存して配
置されており、図２に示すように、ランナー部６に連通
して上型１ａに形成された注入孔８からランナー部６及
びフィルムゲート７を介してキャビティ２に溶融樹脂Ａ
を射出注入し得るように構成されている。尚、本実施例
では、樹脂注入部３のうち、ランナー部６の中央部に配
置された樹脂注入部３ａは、あらかじめ第１順位の射出
注入用として定められ、ランナー部６の両端部に配置さ
れた樹脂注入部３ｂ，３ｂは第２順位の射出注入用とし
て定められている。In this case, the injection molding apparatus of this embodiment is for molding, for example, a flat resin product W (see FIG. 3C), and correspondingly, the cavity 2 is also flat. Has been formed. Further, as shown in FIGS. 2 and 3, a runner portion 6 extending along one side edge portion of the cavity 2 is formed between the upper die 1a and the lower die 1b. Is connected to one side edge of the cavity 2 through a film gate 7. The resin injection part 3 is arranged in the runner part 6 at intervals in the longitudinal direction thereof, and as shown in FIG. 2, an injection hole communicating with the runner part 6 and formed in the upper mold 1a. 8 through the runner portion 6 and the film gate 7 into the cavity 2
Is configured to be injected and injected. In the present embodiment, the resin injection part 3a of the resin injection part 3 arranged in the central part of the runner part 6 is determined in advance for injection injection of the first order, and is arranged at both ends of the runner part 6. The resin injection parts 3b, 3b thus set are defined for second-order injection injection.
【００１７】前記樹脂供給手段４は、図１に示すように
金型１の外部に設けられた樹脂供給源９と、該樹脂供給
源９から導出されて前記ホットランナー５に接続された
供給ノズル１０と、上型１ａ内で前記ホットランナー５
から分岐されて各樹脂注入部３の注入孔８に連通された
分岐供給路１１とを備え、樹脂供給源９から供給ノズル
１０、ホットランナー５及び分岐供給路１１を順に介し
て各樹脂注入部３に溶融樹脂Ａを分配・供給するように
している。The resin supply means 4 is, as shown in FIG. 1, a resin supply source 9 provided outside the mold 1 and a supply nozzle which is led from the resin supply source 9 and connected to the hot runner 5. 10 and the hot runner 5 in the upper mold 1a
And a branch supply path 11 that is communicated with the injection hole 8 of each resin injection section 3, and each resin injection section from the resin supply source 9 through the supply nozzle 10, the hot runner 5, and the branch supply path 11 in order. The molten resin A is distributed and supplied to No. 3.
【００１８】また、図１において、１２，１２は前記樹
脂注入部３のうち、第２順位の樹脂注入部３ｂ，３ｂの
注入孔８を開閉する開閉弁、１３は各開閉弁１２の開閉
駆動を行う開閉弁駆動手段である。Further, in FIG. 1, reference numerals 12 and 12 denote open / close valves for opening / closing the injection holes 8 of the second-order resin injecting portions 3b, 3b of the resin injecting portion 3, and 13 denotes open / close driving of each open / close valve 12. It is an on-off valve drive means for
【００１９】各開閉弁１２は、図２に示すように樹脂注
入部３ａの注入孔８に連通する分岐供給路１１内で該注
入孔８に向かって同心に昇降自在に設けられたピン状の
ものであり、同図実線示のように上昇されて注入孔８か
ら離反された状態で、該注入孔８を開放し、同図仮想線
示のように下降されて注入孔８に嵌挿された状態で、該
注入孔８を閉塞するようにしている。As shown in FIG. 2, each on-off valve 12 is a pin-like member provided concentrically and vertically toward the injection hole 8 in a branch supply passage 11 communicating with the injection hole 8 of the resin injection portion 3a. The injection hole 8 is opened in a state where the injection hole 8 is lifted and separated from the injection hole 8 as shown by the solid line in the figure, and is lowered and fitted into the injection hole 8 as shown by the phantom line in the figure. In this state, the injection hole 8 is closed.
【００２０】前記開閉弁駆動手段１３は、図１に示すよ
うに上型１ａの上方から前記各開閉弁１２を設けた分岐
供給路１１内に挿通されて該開閉弁１２に同心に連結さ
れたピストンロッド１４ａを有する油圧シリンダ１４
と、各油圧シリンダ１４を作動させるべく該油圧シリン
ダ１４に接続された油圧回路網１５とを備え、油圧シリ
ンダ１４の内部には、ピストンロッド１４ａに同心に連
結されたピストン１４ｂにより、一対の油室１６，１７
が形成されている。この場合、油圧シリンダ１４は、油
室１６に作動油が供給されると共に油室１７から作動油
が排出された時にピストン１４ｂ及びピストンロッド１
４ａを介して開閉弁１２を下降させて樹脂注入部３ｂの
注入孔８を閉塞し、これと逆に油室１７に作動油が供給
されると共に油室１６から作動油が排出された時に開閉
弁１１を上昇させて樹脂注入部３ｂの注入孔８を開放す
るようにしている。As shown in FIG. 1, the opening / closing valve driving means 13 is inserted from above the upper mold 1a into the branch supply passage 11 provided with the opening / closing valves 12 and is concentrically connected to the opening / closing valve 12. Hydraulic cylinder 14 having piston rod 14a
And a hydraulic circuit network 15 connected to the hydraulic cylinders 14 to operate the hydraulic cylinders 14. Inside the hydraulic cylinders 14, a pair of oils is provided by a piston 14b concentrically connected to a piston rod 14a. Chambers 16 and 17
Are formed. In this case, the hydraulic cylinder 14 has the piston 14 b and the piston rod 1 when the working oil is supplied to the oil chamber 16 and the working oil is discharged from the oil chamber 17.
The opening / closing valve 12 is lowered via 4a to close the injection hole 8 of the resin injection portion 3b, and conversely, when the operating oil is supplied to the oil chamber 17 and is discharged from the oil chamber 16, the opening / closing is performed. The valve 11 is raised to open the injection hole 8 of the resin injection portion 3b.
【００２１】前記油圧回路網１５は、作動油タンク１８
と、３ポート切換弁１９と、各油圧シリンダ１４の油室
１６，１７から導出されて切換弁１９に接続された流体
経路２０，２１と、作動油タンク１８から導出されて切
換弁１９に接続された流体経路２２，２３とを備え、流
体経路２２の途中には、ポンプ２４が設けられ、流体経
路２１の途中には、流量調整弁２５と、これに並列に接
続された逆止弁２６とが設けられている。The hydraulic circuit network 15 includes a hydraulic oil tank 18
A three-port switching valve 19, fluid paths 20 and 21 derived from the oil chambers 16 and 17 of each hydraulic cylinder 14 and connected to the switching valve 19, and a fluid port 20 derived from the hydraulic oil tank 18 and connected to the switching valve 19. A pump 24 is provided in the middle of the fluid path 22, and a flow rate adjusting valve 25 and a check valve 26 connected in parallel therewith are provided in the middle of the fluid path 21. And are provided.
【００２２】この場合、切換弁１９は、図示しないコン
トローラの制御により、開閉弁１２を開く際には、流体
経路２２，２３をそれぞれ流体経路２０，２１に接続
し、開閉弁１２を閉じる際には、流体経路２２，２３を
それぞれ流体経路２１，２０に接続するようにしてい
る。In this case, the switching valve 19 is controlled by a controller (not shown) to connect the fluid passages 22 and 23 to the fluid passages 20 and 21 when opening the on-off valve 12 and to close the on-off valve 12, respectively. Connects the fluid paths 22 and 23 to the fluid paths 21 and 20, respectively.
【００２３】また、流量調整弁２５は、油室１６から作
動油を排出する際に、図示しないコントローラの制御に
より、その作動油の排出量を適宜調整するようにしてい
る。Further, the flow rate adjusting valve 25 is adapted to appropriately adjust the discharge amount of the hydraulic oil under the control of a controller (not shown) when the hydraulic oil is discharged from the oil chamber 16.
【００２４】尚、流量調整弁２５と並列に流体経路２１
に接続された逆止弁２６は、該逆止弁２６の箇所で、切
換弁１９側から油室１６側への作動油の流動を許容する
一方、油室１６側から切換弁１９側への作動油の流動を
阻止するようにしている。次に、かかる射出成形装置の
作動を説明する。The fluid path 21 is provided in parallel with the flow rate adjusting valve 25.
The check valve 26 connected to the valve allows the flow of the hydraulic oil from the switching valve 19 side to the oil chamber 16 side at the check valve 26, while the check valve 26 is connected from the oil chamber 16 side to the switching valve 19 side. The flow of hydraulic oil is blocked. Next, the operation of the injection molding apparatus will be described.
【００２５】図１において、樹脂製品Ｗ（図３（ｃ）参
照）を成形する際には、まず、前記油圧回路網１５の切
換弁１９により、前記流体経路２２，２３がそれぞれ流
体経路２１，２０に接続され、ポンプ２４が作動され
る。この時、作動油タンク１８内の作動油が流体経路２
２、切換弁１９及び流体経路２１を介して各油圧シリン
ダ１４の油室１６に供給されると共に各油圧シリンダ１
４の油室１７内の作動油が流体経路２０、切換弁１９及
び流体経路２３を介して作動油タンク１８に排出され
る。これにより、前述したように各油圧シリンダ１４が
作動して前記各開閉弁１２を閉側に駆動し、該開閉弁１
２により第２順位の各樹脂注入部３ｂの注入孔８が閉塞
される。In molding the resin product W (see FIG. 3 (c)) in FIG. 1, first, the fluid paths 22 and 23 are respectively changed by the switching valve 19 of the hydraulic circuit network 15. 20 and the pump 24 is activated. At this time, the hydraulic oil in the hydraulic oil tank 18 is transferred to the fluid path 2
2, the oil is supplied to the oil chamber 16 of each hydraulic cylinder 14 via the switching valve 19 and the fluid path 21, and each hydraulic cylinder 1
The hydraulic oil in the oil chamber 17 of No. 4 is discharged to the hydraulic oil tank 18 via the fluid path 20, the switching valve 19 and the fluid path 23. As a result, as described above, each hydraulic cylinder 14 operates to drive each on-off valve 12 to the closing side, and the on-off valve 1
2, the injection hole 8 of each second-order resin injection portion 3b is closed.
【００２６】次いで、上記のように第２順位の各樹脂注
入部３ｂの注入孔８が閉塞された状態で、前記樹脂供給
源９から供給ノズル１０、ホットランナー５及び各分岐
供給路１１を介して溶融樹脂Ａが各樹脂注入部３に分配
・供給される。Next, with the injection holes 8 of the second-order resin injection parts 3b closed as described above, the resin supply source 9 is used to supply the resin through the supply nozzle 10, the hot runner 5, and the branch supply paths 11. The molten resin A is distributed and supplied to each resin injecting section 3.
【００２７】この時、図３（ａ）に示すように、樹脂注
入部３のうち、第１順位の樹脂注入部３ａに供給された
溶融樹脂Ａａは、樹脂注入部３ａの注入孔８から前記ラ
ンナー部６に射出注入され、該ランナー部６をほぼ充填
した後に、樹脂注入部３ａの近傍箇所において、前記フ
ィルムゲート７を介してキャビティ２内に流動してい
く。At this time, as shown in FIG. 3 (a), the molten resin Aa supplied to the first-order resin injecting portion 3a of the resin injecting portion 3 is injected through the injection hole 8 of the resin injecting portion 3a. After being injected and injected into the runner portion 6 to almost fill the runner portion 6, it flows into the cavity 2 through the film gate 7 in the vicinity of the resin injecting portion 3a.
【００２８】そして、樹脂注入部３ａから射出注入され
た溶融樹脂Ａａが、ランナー部６に充填されて第２順位
の樹脂注入部３ｂ，３ｂの位置に達すると共に、ある程
度該ランナー部６からフィルムゲート７を介してキャビ
ティ２に流動すると、次に、図示しないコントローラの
制御により、切換弁１９が作動されて、前記流体経路２
２，２３がそれぞれ流体経路２０，２１に接続される。The molten resin Aa injected and injected from the resin injecting portion 3a is filled in the runner portion 6 and reaches the positions of the second-order resin injecting portions 3b and 3b, and to a certain extent from the runner portion 6 to the film gate. When the fluid flows into the cavity 2 via 7, the switching valve 19 is operated by the control of a controller (not shown), and the fluid path 2
2 and 23 are connected to the fluid paths 20 and 21, respectively.
【００２９】この時、前記作動油タンク１８から流体経
路２２、切換弁１９及び流体経路２０を介して各油圧シ
リンダ１４の油室１７に作動油が供給されると共に、油
室１６内の作動油が流体経路２１の流量調整弁２５、切
換弁１９及び流体経路２３を介して作動油タンク１８に
排出される。これにより前述したように、各油圧シリン
ダ１４が作動して前記各開閉弁１２を開側に駆動し、第
２順位の各樹脂注入部３ｂの注入孔８が開放される。そ
して、この開放により、樹脂注入部３ｂにホットランナ
ー５から分配・供給されていた溶融樹脂Ａがその液圧に
より、各樹脂注入部３ｂからランナー部６に射出注入さ
れるようになる。At this time, the working oil is supplied from the working oil tank 18 to the oil chamber 17 of each hydraulic cylinder 14 via the fluid path 22, the switching valve 19 and the fluid path 20, and the working oil in the oil chamber 16 is also supplied. Is discharged to the hydraulic oil tank 18 via the flow rate adjusting valve 25 of the fluid path 21, the switching valve 19 and the fluid path 23. As a result, as described above, the hydraulic cylinders 14 operate to drive the open / close valves 12 to the open side, and the injection holes 8 of the second-order resin injection parts 3b are opened. Then, by this opening, the molten resin A distributed and supplied from the hot runner 5 to the resin injecting section 3b is injected and injected from each resin injecting section 3b into the runner section 6 by its liquid pressure.
【００３０】この時、流量調整弁２５は、図示しないコ
ントローラの制御により、各油圧シリンダ１４の油室１
６から排出される作動油の量を徐々に増加させる。これ
により、各油圧シリンダ１４のピストン１４ｂ及びピス
トンロッド１４ａは徐々に上昇し、従って、開閉弁１２
は徐々に各樹脂注入部３ｂの注入孔８を開放する。At this time, the flow rate adjusting valve 25 is controlled by a controller (not shown) to control the oil chamber 1 of each hydraulic cylinder 14.
The amount of hydraulic oil discharged from 6 is gradually increased. As a result, the piston 14b and the piston rod 14a of each hydraulic cylinder 14 gradually rise, and therefore the on-off valve 12
Gradually opens the injection hole 8 of each resin injection portion 3b.
【００３１】このため、第２順位の樹脂注入部３ｂ，３
ｂからランナー部６に射出注入される溶融樹脂Ａは、そ
の量が徐々に増加していき、これに従って、ホットラン
ナー５から第２順位の樹脂注入部３ｂ，３ｂに分配・供
給される溶融樹脂量が徐々に増加していくことにより、
第１順位の樹脂注入部３ａから射出注入される溶融樹脂
量、換言すれば、該ホットランナー５から第１順位の樹
脂注入部３ａに分配・供給される溶融樹脂量が徐々に減
少していく。Therefore, the second-order resin injection parts 3b, 3
The amount of the molten resin A injected and injected from the b to the runner portion 6 gradually increases, and accordingly, the molten resin distributed and supplied from the hot runner 5 to the second-order resin injecting portions 3b and 3b. By gradually increasing the amount,
The amount of molten resin injected and injected from the first-order resin injection unit 3a, in other words, the amount of molten resin distributed and supplied from the hot runner 5 to the first-order resin injection unit 3a gradually decreases. .
【００３２】従って、第１順位の樹脂注入部３ａから射
出注入される溶融樹脂量は、第２順位の樹脂注入部３
ｂ，３ｂの開放により、急激に減少するようなことはな
い。そして、このように、第１順位の樹脂注入部３ａか
ら射出注入される溶融樹脂量が急激に減少することがな
いので、該樹脂注入部３ａからランナー部６及びフィル
ムゲート７を介してキャビティ２に供給されていた溶融
樹脂Ａａの流頭がその流速を急激に変化させるようなこ
とはなく、スムーズにキャビティ２内に拡散していく。Therefore, the amount of molten resin injected and injected from the first-order resin injection section 3a is the same as the second-order resin injection section 3a.
The opening of b and 3b does not cause a sharp decrease. In this way, since the amount of molten resin injected and injected from the first-order resin injecting section 3a does not suddenly decrease, the cavity 2 is inserted from the resin injecting section 3a through the runner section 6 and the film gate 7. The flow front of the molten resin Aa that has been supplied to does not abruptly change the flow velocity, and diffuses smoothly into the cavity 2.
【００３３】尚、ホットランナー５から各樹脂注入部３
に分配・供給される溶融樹脂量、すなわち、各樹脂注入
部３からランナー部６に射出注入される溶融樹脂量は、
最終的には、第２順位の樹脂注入部３ｂ，３ｂが全開に
されると、各樹脂注入部３の注入孔８の開口径等によっ
て定まる量に概ね定まる。From the hot runner 5 to each resin injection part 3
The amount of molten resin distributed / supplied to, that is, the amount of molten resin injected from each resin injecting section 3 into the runner section 6 is
Finally, when the second-order resin injection parts 3b, 3b are fully opened, the amount is approximately determined by the opening diameter of the injection hole 8 of each resin injection part 3 and the like.
【００３４】上記のように、第２順位の樹脂注入部３
ｂ，３ｂからの射出注入が開始すると、該樹脂注入部３
ｂからランナー部６内に射出注入された溶融樹脂Ａｂ
は、図３（ｂ）に示すように、ランナー部６内において
第１順位の樹脂注入部３ａから射出注入された溶融樹脂
Ａａと融合しつつ、各樹脂注入部３ｂの近傍箇所でラン
ナー部６からフィルムゲート７を介してキャビティ２内
に流動していく。そして、キャビティ２内に拡散してい
た溶融樹脂Ａは、各樹脂注入部３からの溶融樹脂Ａの射
出注入圧により、最終的に図３（ｃ）に示すようにキャ
ビティ２内の全体に拡散し、該キャビティ２を充填す
る。これにより、該キャビティ２に平板状の樹脂製品Ｗ
が得られる。そして、かかる後には、上型１ａと下型１
ｂとが開かれて、キャビティ２から樹脂製品Ｗが取り出
される。As described above, the second-order resin injection part 3
When injection injection from b and 3b is started, the resin injection part 3
Molten resin Ab injected into the runner portion 6 from b
As shown in FIG. 3B, while being fused with the molten resin Aa injected and injected from the first-order resin injecting portion 3a in the runner portion 6, the runner portion 6 is provided in the vicinity of each resin injecting portion 3b. Flow through the film gate 7 into the cavity 2. Then, the molten resin A diffused in the cavity 2 is finally diffused into the entire cavity 2 as shown in FIG. 3C by the injection pressure of the molten resin A injected from each resin injecting portion 3. Then, the cavity 2 is filled. As a result, a flat resin product W is placed in the cavity 2.
Is obtained. After that, the upper mold 1a and the lower mold 1
b and are opened, and the resin product W is taken out from the cavity 2.
【００３５】以上説明したように、本実施例の射出成形
においては、第１順位の樹脂注入部３ａからランナー部
６に射出注入された溶融樹脂Ａａがランナー部６を充填
し、第２順位の樹脂注入部３ｂ，３ｂの位置に達した後
に、該第２順位の樹脂注入部３ｂ，３ｂからの溶融樹脂
Ａｂの射出注入を開始するようにしているので、樹脂製
品Ｗにウェルドマークが生じるのが防止される。As described above, in the injection molding of the present embodiment, the molten resin Aa injected and injected from the first-order resin injecting portion 3a into the runner portion 6 fills the runner portion 6, and the second-ranking resin is injected. After reaching the positions of the resin injecting portions 3b, 3b, the injection injection of the molten resin Ab from the resin injecting portions 3b, 3b of the second order is started, so that the weld mark is generated in the resin product W. Is prevented.
【００３６】そして、第２順位の樹脂注入部３ｂ，３ｂ
からの溶融樹脂Ａｂの射出注入に際しては、該樹脂注入
部３ｂの注入孔８を徐々に開放するようにしているの
で、第１順位の樹脂注入部３ａからランナー部６及びフ
ィルムゲート７を介してキャビティ２に射出注入されて
いる溶融樹脂Ａａの量が急激に減少することが避けら
れ、該溶融樹脂Ａａの流頭は急激な流速変化を生じるこ
となくスムーズにキャビティ２内に拡散していく。従っ
て、樹脂製品Ｗに所謂、フローマークが生じるのも防止
される。Then, the second-order resin injecting portions 3b, 3b
Since the injection hole 8 of the resin injection portion 3b is gradually opened at the time of injection injection of the molten resin Ab from the resin injection portion 3a, the resin injection portion 3a of the first order is inserted through the runner portion 6 and the film gate 7. It is possible to prevent the amount of the molten resin Aa injected and injected into the cavity 2 from abruptly decreasing, and the flow front of the molten resin Aa smoothly diffuses into the cavity 2 without causing a rapid change in the flow velocity. Therefore, so-called flow marks are also prevented from occurring in the resin product W.
【００３７】また、本実施例においては、各樹脂注入部
３から直接的にキャビティ２に溶融樹脂Ａを注入せず、
ランナー部６及びフィルムゲート７を介してキャビティ
２に射出注入するようにしているので、各樹脂注入部３
からランナー部６に射出注入された溶融樹脂Ａが該ラン
ナー部６において確実に融合した状態でキャビティ２に
フィルムゲート７の各所を介して射出注入され、従っ
て、均質な樹脂製品Ｗを得ることができる。Further, in this embodiment, the molten resin A is not directly injected into the cavity 2 from each resin injection portion 3,
Since the cavity 2 is injected and injected through the runner portion 6 and the film gate 7, each resin injection portion 3
The molten resin A injected and injected into the runner portion 6 from the above is injected and injected into the cavity 2 through each part of the film gate 7 in a state of being surely fused in the runner portion 6, so that a homogeneous resin product W can be obtained. it can.
【００３８】[0038]
【発明の効果】上記の説明から明らかなように、本発明
の射出成形方法によれば、同一の樹脂供給路から複数の
樹脂注入部に溶融樹脂を分配・供給すると共に、該複数
の樹脂注入部からあらかじめ定めた注入順位に従って溶
融樹脂をキャビティに射出注入して樹脂製品を成形する
際に、先行順位の樹脂注入部から射出注入された溶融樹
脂が後順位の樹脂注入部の位置に達した後に、該後順位
の樹脂注入部からの溶融樹脂の射出注入を開始し、この
時、該後順位の樹脂注入部を開閉する開閉弁を徐々に開
放するようにしたことによって、ウェルドマークが樹脂
製品に生じるのを防止することができると共に、後順位
の樹脂注入部の開放時に先行順位の樹脂注入部から射出
注入される溶融樹脂が急激に減少するのを防止して、樹
脂製品にフローマークが生じるのも防止することがで
き、従って、高品質の樹脂製品を得ることができる。As is apparent from the above description, according to the injection molding method of the present invention, molten resin is distributed and supplied from the same resin supply path to a plurality of resin injection parts, and the plurality of resin injection parts are injected. When a molten resin is injected into a cavity according to a predetermined injection order from a part to mold a resin product, the molten resin injected from the preceding resin injection section reaches the position of the subsequent resin injection section. After that, the injection injection of the molten resin from the resin injection section of the subsequent order is started, and at this time, the opening / closing valve for opening and closing the resin injection section of the subsequent order is gradually opened, so that the weld mark becomes a resin. It is possible to prevent the occurrence of the product in the product, and to prevent the molten resin injected from the resin injection part of the preceding rank from suddenly decreasing when the resin injection part of the latter rank is opened, and the Click can also be prevented from occurring, therefore, it is possible to obtain a high quality resin products.
【００３９】また、本発明の射出成形装置によれば、上
記の射出成形方法に従って射出成形を行い得るように構
成したことによって、樹脂製品にウェルドマークやフロ
ーマークが生じるのを防止することができ、高品質の樹
脂製品を得ることができる。Further, according to the injection molding apparatus of the present invention, since the injection molding is performed according to the above-mentioned injection molding method, it is possible to prevent the weld mark and the flow mark from being generated in the resin product. , High quality resin products can be obtained.
【図１】本発明の一例を適用して構成した射出成形装置
のシステム構成図。FIG. 1 is a system configuration diagram of an injection molding apparatus configured by applying an example of the present invention.
【図２】図１のＩＩ−ＩＩ線断面図。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】図１の射出成形装置による射出成形方法を説明
するための説明図。FIG. 3 is an explanatory view for explaining an injection molding method by the injection molding apparatus of FIG.
【図４】従来の射出成形方法を説明するための説明図。FIG. 4 is an explanatory view for explaining a conventional injection molding method.
１…金型、２…キャビティ、３…樹脂注入部、４…樹脂
供給手段、５…ホットランナー（樹脂供給路）、１２…
開閉弁、１３…開閉弁駆動手段、Ａ…溶融樹脂、Ｗ…樹
脂製品。DESCRIPTION OF SYMBOLS 1 ... Mold, 2 ... Cavity, 3 ... Resin injection part, 4 ... Resin supply means, 5 ... Hot runner (resin supply path), 12 ...
Open / close valve, 13 ... Open / close valve drive means, A ... Molten resin, W ... Resin product.
Claims (2)
入部から溶融樹脂を射出注入可能に金型に設けられたキ
ャビティと前記複数の樹脂注入部を連通して設けられた
樹脂供給路とを備えた射出成形装置を用い、前記樹脂供
給路から前記複数の樹脂注入部に溶融樹脂を分配・供給
すると共に、該溶融樹脂を前記複数の樹脂注入部からそ
の注入順位に従って前記キャビティに射出注入すること
により樹脂製品を射出成形する方法において、前記複数
の樹脂注入部のうち、第２順位以降の後順位の樹脂注入
部から前記キャビティに溶融樹脂を射出注入する際に、
当該後順位に先行する先行順位の樹脂注入部から前記キ
ャビティに射出注入された溶融樹脂の流頭が当該後順位
の樹脂注入部の位置に達した後に、当該後順位の樹脂注
入部を開閉自在に設けた開閉弁を開放して当該後順位の
樹脂注入部から前記キャビティへの溶融樹脂の射出注入
を開始せしめ、この時、前記樹脂供給路から前記先行順
位の樹脂注入部を介して前記キャビティに射出注入され
ている溶融樹脂量の急激な低下を抑制すべく前記開閉弁
を徐々に開放して、前記第２の樹脂注入部から前記キャ
ビティに射出注入される溶融樹脂量を徐々に増加させる
ことを特徴とする射出成形方法。1. A cavity provided in a mold capable of injecting and injecting a molten resin from a plurality of resin injecting portions having a predetermined injection order, and a resin supply path provided so as to communicate the plurality of resin injecting portions. Using the injection molding apparatus provided, the molten resin is distributed and supplied from the resin supply path to the plurality of resin injection parts, and the molten resin is injected and injected from the plurality of resin injection parts into the cavity according to the injection order. In the method of injection-molding a resin product by the above, when injecting the molten resin into the cavity from the resin injecting section of the second order or later in the plurality of resin injecting sections,
After the front of the molten resin injected into the cavity from the resin injection section of the preceding order preceding the latter order reaches the position of the resin injection section of the subsequent order, the resin injection section of the latter order can be opened and closed. The opening / closing valve provided in the cavity is opened to start injection and injection of the molten resin into the cavity from the resin injection section of the latter rank, and at this time, the cavity is injected from the resin supply passage through the resin injection section of the preceding rank. The opening / closing valve is gradually opened in order to suppress a sudden decrease in the amount of molten resin injected and injected into the cavity, and the amount of molten resin injected and injected into the cavity from the second resin injection portion is gradually increased. An injection molding method characterized by the above.
入部から溶融樹脂を射出注入可能に金型に設けられたキ
ャビティと、前記複数の樹脂注入部を連通して設けられ
た樹脂供給路を介して前記複数の樹脂注入部に溶融樹脂
を分配・供給する樹脂供給手段と、前記複数の樹脂注入
部のうち、少なくとも第２順位以降の注入順位の樹脂注
入部を各々開閉自在に設けられた開閉弁と、前記各樹脂
注入部に供給された溶融樹脂を前記注入順位に従って前
記各樹脂注入部から前記キャビティに射出注入すべく前
記開閉弁を所定のタイミングで開放せしめる開閉弁駆動
手段とを備え、該開閉弁駆動手段は、前記複数の樹脂注
入部のうち、先行順位の樹脂注入部から射出注入された
溶融樹脂の流頭が次順位の樹脂注入部の位置に達した後
に、該次順位の樹脂注入部に対応する前記開閉弁を開放
せしめると共に、前記樹脂供給路から前記先行順位の樹
脂注入部を介して前記キャビティに射出注入されている
溶融樹脂量の急激な低下を抑制すべく前記次順位の樹脂
注入部に対応する前記開閉弁を徐々に開放せしめること
を特徴とする射出成形装置。2. A cavity provided in a mold capable of injecting and injecting a molten resin from a plurality of resin injecting portions having a predetermined injection order, and a resin supply path provided in communication with the plurality of resin injecting portions. A resin supply unit that distributes and supplies a molten resin to the plurality of resin injection units via the resin injection unit, and at least a resin injection unit of the second or higher order of injection among the plurality of resin injection units are openably and closably provided. An on-off valve, and an on-off valve driving means for opening the on-off valve at a predetermined timing to inject and inject the molten resin supplied to each of the resin injecting parts into the cavity according to the injection order. The on-off valve driving means is configured to, after the flow front of the molten resin injected and injected from the preceding-order resin injection section of the plurality of resin injection sections reaches the position of the next-order resin injection section, Tree In addition to opening the on-off valve corresponding to the injection part, in order to suppress a sudden decrease in the amount of molten resin injected from the resin supply passage into the cavity through the resin injection part of the preceding order, the next order The opening / closing valve corresponding to the resin injecting part is gradually opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22583892A JP2665112B2 (en) | 1992-08-25 | 1992-08-25 | Injection molding method and injection molding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22583892A JP2665112B2 (en) | 1992-08-25 | 1992-08-25 | Injection molding method and injection molding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0664002A true JPH0664002A (en) | 1994-03-08 |
| JP2665112B2 JP2665112B2 (en) | 1997-10-22 |
Family
ID=16835619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22583892A Expired - Fee Related JP2665112B2 (en) | 1992-08-25 | 1992-08-25 | Injection molding method and injection molding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2665112B2 (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002067095A (en) * | 2000-08-28 | 2002-03-05 | Denso Corp | Method for molding resin containing long fibers and moldings formed of the resin |
| JP2006224499A (en) * | 2005-02-18 | 2006-08-31 | Hirotec Corp | Injection molding machine and injection molding method |
| EP2226173A1 (en) | 2009-03-06 | 2010-09-08 | Incoe International Inc. | Method for injection moulding, in particular cascade injection moulding, and device for carrying out the method |
| EP2360003A1 (en) * | 2010-02-18 | 2011-08-24 | PSG Plastic Service GmbH | Method and device for operating a needle valve nozzle of an injection moulding tool |
| WO2011125121A1 (en) * | 2010-04-07 | 2011-10-13 | 三菱重工プラスチックテクノロジー株式会社 | Injection molding method of resin |
| WO2012074879A1 (en) * | 2010-11-23 | 2012-06-07 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| ITTO20110750A1 (en) * | 2011-08-08 | 2013-02-09 | Inglass Spa | COMMAND DEVICE FOR A MOLDING INJECTOR WITH INJECTION OF PLASTIC MATERIALS |
| US20150158227A1 (en) * | 2012-05-31 | 2015-06-11 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| JP2016107517A (en) * | 2014-12-05 | 2016-06-20 | パナソニックＩｐマネジメント株式会社 | Injection molding method of planar member for bathroom |
| EP2585285A4 (en) * | 2010-06-22 | 2017-12-27 | CooperVision International Holding Company, LP | Methods, devices, and systems for injection molding contact lenses |
| WO2018020177A1 (en) * | 2016-07-28 | 2018-02-01 | Runipsys Europe | System for controlling a shutter of a plastics injection system |
| CN108430729A (en) * | 2016-07-20 | 2018-08-21 | 圣万提注塑工业（苏州）有限公司 | The method that injection molding apparatus and automatic cycle are molded to torus |
| US10328623B2 (en) | 2011-11-23 | 2019-06-25 | Synventive Molding Solutions, Inc. | Actuator cooling apparatus and method |
| EP3195998B1 (en) | 2012-08-08 | 2020-11-11 | Synventive Molding Solutions, Inc. | Flow control apparatus and method |
| EP3488989B1 (en) | 2013-07-08 | 2020-12-09 | Synventive Molding Solutions, Inc. | Non-coaxially mounted electric actuator and transmission |
| WO2020256999A1 (en) * | 2019-06-18 | 2020-12-24 | Incoe Corporation | Flow control of an injection molding system |
| US10899056B2 (en) | 2011-11-23 | 2021-01-26 | Synventive Molding Solutions, Inc. | Non-coaxially mounted electric actuator and transmission |
| CN115846623A (en) * | 2022-12-22 | 2023-03-28 | 广东鸿兴精密科技股份有限公司 | Novel low pressure casting system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4015183B1 (en) * | 2020-12-16 | 2024-10-09 | Ningbo Geely Automobile Research & Development Co., Ltd. | Injection moulding apparatus and method to reduce velocity increase of flow front during injection moulding |
-
1992
- 1992-08-25 JP JP22583892A patent/JP2665112B2/en not_active Expired - Fee Related
Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002067095A (en) * | 2000-08-28 | 2002-03-05 | Denso Corp | Method for molding resin containing long fibers and moldings formed of the resin |
| JP2006224499A (en) * | 2005-02-18 | 2006-08-31 | Hirotec Corp | Injection molding machine and injection molding method |
| EP2226173A1 (en) | 2009-03-06 | 2010-09-08 | Incoe International Inc. | Method for injection moulding, in particular cascade injection moulding, and device for carrying out the method |
| WO2010101709A3 (en) * | 2009-03-06 | 2010-12-09 | Incoe Corporation | Process and device for cascade injection molding |
| EP2360003A1 (en) * | 2010-02-18 | 2011-08-24 | PSG Plastic Service GmbH | Method and device for operating a needle valve nozzle of an injection moulding tool |
| US8932506B2 (en) | 2010-04-07 | 2015-01-13 | Mitsubishi Heavy Industries Plastic Technology | Resin injection molding method |
| WO2011125121A1 (en) * | 2010-04-07 | 2011-10-13 | 三菱重工プラスチックテクノロジー株式会社 | Injection molding method of resin |
| EP2585285A4 (en) * | 2010-06-22 | 2017-12-27 | CooperVision International Holding Company, LP | Methods, devices, and systems for injection molding contact lenses |
| EP2620266A1 (en) * | 2010-11-23 | 2013-07-31 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US11148335B2 (en) | 2010-11-23 | 2021-10-19 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US10160150B2 (en) | 2010-11-23 | 2018-12-25 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US10173356B2 (en) | 2010-11-23 | 2019-01-08 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US9005509B2 (en) | 2010-11-23 | 2015-04-14 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US9011736B2 (en) | 2010-11-23 | 2015-04-21 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US11186022B2 (en) | 2010-11-23 | 2021-11-30 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| CN103068551A (en) * | 2010-11-23 | 2013-04-24 | 圣万提注塑工业有限公司 | Injection molding flow control apparatus and method |
| US9623598B2 (en) | 2010-11-23 | 2017-04-18 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US9636858B2 (en) | 2010-11-23 | 2017-05-02 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| WO2012074879A1 (en) * | 2010-11-23 | 2012-06-07 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| ITTO20110750A1 (en) * | 2011-08-08 | 2013-02-09 | Inglass Spa | COMMAND DEVICE FOR A MOLDING INJECTOR WITH INJECTION OF PLASTIC MATERIALS |
| EP2556941A1 (en) * | 2011-08-08 | 2013-02-13 | Inglass S.p.A. | Control device of an injector for injection molding of plastic material |
| US10899056B2 (en) | 2011-11-23 | 2021-01-26 | Synventive Molding Solutions, Inc. | Non-coaxially mounted electric actuator and transmission |
| US10328623B2 (en) | 2011-11-23 | 2019-06-25 | Synventive Molding Solutions, Inc. | Actuator cooling apparatus and method |
| US9682507B2 (en) * | 2012-05-31 | 2017-06-20 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| US20150158227A1 (en) * | 2012-05-31 | 2015-06-11 | Synventive Molding Solutions, Inc. | Injection molding flow control apparatus and method |
| EP3195998B1 (en) | 2012-08-08 | 2020-11-11 | Synventive Molding Solutions, Inc. | Flow control apparatus and method |
| EP3488989B1 (en) | 2013-07-08 | 2020-12-09 | Synventive Molding Solutions, Inc. | Non-coaxially mounted electric actuator and transmission |
| US11007692B1 (en) | 2013-07-08 | 2021-05-18 | Synventive Molding Solutions, Inc. | Non-coaxially mounted electric actuator and transmission |
| JP2016107517A (en) * | 2014-12-05 | 2016-06-20 | パナソニックＩｐマネジメント株式会社 | Injection molding method of planar member for bathroom |
| CN108430729A (en) * | 2016-07-20 | 2018-08-21 | 圣万提注塑工业（苏州）有限公司 | The method that injection molding apparatus and automatic cycle are molded to torus |
| FR3054473A1 (en) * | 2016-07-28 | 2018-02-02 | Runipsys Europe | SYSTEM FOR CONTROLLING A SHUTTER OF A PLASTIC MATERIAL INJECTION SYSTEM |
| WO2018020177A1 (en) * | 2016-07-28 | 2018-02-01 | Runipsys Europe | System for controlling a shutter of a plastics injection system |
| US11027471B2 (en) | 2016-07-28 | 2021-06-08 | Runipsys Europe | System for controlling a shutter of a plastics injection system |
| WO2020256999A1 (en) * | 2019-06-18 | 2020-12-24 | Incoe Corporation | Flow control of an injection molding system |
| CN115846623A (en) * | 2022-12-22 | 2023-03-28 | 广东鸿兴精密科技股份有限公司 | Novel low pressure casting system |
| CN115846623B (en) * | 2022-12-22 | 2023-08-11 | 广东鸿兴精密科技股份有限公司 | Low pressure casting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2665112B2 (en) | 1997-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0664002A (en) | Injection molding method and injection molding equipment | |
| US5204050A (en) | Gas assisted injection molding | |
| US5378138A (en) | Valve gate injection molding apparatus | |
| US4855094A (en) | Method for the injection molding of plastic articles using fluid pressure | |
| US20100225025A1 (en) | Process and device for cascade injection molding | |
| JPH0536215B2 (en) | ||
| AU635235B2 (en) | Injection mold method and apparatus | |
| EP0321117B2 (en) | Method and system for localized fluid-assisted injection molding and body formed thereby | |
| CA2561480A1 (en) | Method and apparatus for controlling a vent gap with active material elements | |
| US5273707A (en) | Method of injection molding | |
| US5458846A (en) | Method of injection molding | |
| JPH0467923A (en) | Method and mold for injection molding | |
| US6716387B2 (en) | Process for pressure assisted molding of hollow articles | |
| JPH06238706A (en) | Injection molding method | |
| US5997799A (en) | Method for injection-moulding a hollow product using a pressure variation between two gas volumes | |
| JPH0664003A (en) | Injection molding method | |
| JPH07323360A (en) | Method and device for applying release agent in die casting | |
| JP2002127202A (en) | Valve gate assembly for injection molding | |
| JP2000176624A (en) | Die for die casting and die casting method | |
| JP3655992B2 (en) | Vacuum die casting apparatus and casting method | |
| JP3316835B2 (en) | Hot runner mold equipment | |
| JP3582179B2 (en) | Method for producing injection molded article having hollow shape | |
| JP2001138374A (en) | Controlling method for mold clamping of injection molding machine and mold clamping device | |
| JPH09207155A (en) | Hollow injection molding apparatus and method | |
| KR100259133B1 (en) | Weld line removing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20080620 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090620 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 12 Free format text: PAYMENT UNTIL: 20090620 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 13 Free format text: PAYMENT UNTIL: 20100620 |
|
| LAPS | Cancellation because of no payment of annual fees |