JP2692369B2 - Valve gate control method for injection mold - Google Patents
Valve gate control method for injection moldInfo
- Publication number
- JP2692369B2 JP2692369B2 JP2293384A JP29338490A JP2692369B2 JP 2692369 B2 JP2692369 B2 JP 2692369B2 JP 2293384 A JP2293384 A JP 2293384A JP 29338490 A JP29338490 A JP 29338490A JP 2692369 B2 JP2692369 B2 JP 2692369B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- gate
- cavity
- plate
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000002347 injection Methods 0.000 title description 6
- 239000007924 injection Substances 0.000 title description 6
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 238000001746 injection moulding Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
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)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は射出成形用金型のバルブゲート制御方法に関
し、特にこのバルブゲートのバルブ制御方法に関する。TECHNICAL FIELD The present invention relates to a valve gate control method for an injection molding die, and more particularly to a valve control method for this valve gate.
［従来の技術］ 一般にバルブゲートを備えた射出成形用金型は、互い
に突き合わされたキャビティプレートとコアプレートと
を有し、これら両プレートの突き合わせ部にキャビティ
が形成されるとともに、キャビティプレート側にバルブ
ゲートが設けられ、コア側に突き出しピンと突き出し板
からなる突き出し手段が設けられている。このような射
出成形用金型は、前記キャビティプレートを固定側取り
付け板に固定するとともに前記コアプレートを可動側取
り付け板に固定して配設され、両取り付け板によって型
締めされるようになっている。そして、型締状態におい
てバルブゲートのバルブを油圧または空圧により後退さ
せてゲート開口動作を行いキャビティ内に溶融樹脂を射
出し、この後バルブを前進させてゲートシール動作を行
いキャビティの樹脂を冷却し、樹脂凝固後、可動側取り
付け板の降下により型開きを行い、油圧機構による突き
出し板の上昇または可動側取り付け板の降下による突き
出し板の相対的な移動によって突き出しピンを突き出し
て樹脂成形品をコアプレートから離型させるようになっ
ている。[Prior Art] Generally, an injection-molding die provided with a valve gate has a cavity plate and a core plate that are butted against each other, and a cavity is formed at the butted portion of both plates, and the cavity plate is provided on the cavity plate side. A valve gate is provided, and a protrusion means including a protrusion pin and a protrusion plate is provided on the core side. Such an injection molding die is arranged such that the cavity plate is fixed to the fixed side mounting plate and the core plate is fixed to the movable side mounting plate, and the mold is clamped by both mounting plates. There is. Then, in the mold clamping state, the valve of the valve gate is retracted by hydraulic pressure or air pressure to perform the gate opening operation to inject the molten resin into the cavity, and then the valve is advanced to perform the gate sealing operation to cool the resin in the cavity. After the resin has solidified, the movable side mounting plate is lowered to open the mold, and the protrusion pin is pushed out by the relative movement of the protruding plate caused by the hydraulic mechanism raising the protruding plate or lowering the movable side mounting plate to form a resin molded product. It is designed to be released from the core plate.
［発明が解決しようとする課題］ 前記従来技術の射出成形用金型では、通常抜き勾配の
調整あるいは意図的にアンダーカットを成形品につける
などの手段によって樹脂成形品がコア側に残るように構
成されているが、成形品の形状によってはこれらの手段
によっても成形品がコア側に残らない場合があり、この
ような問題に対処するにはキャビティプレート側にも突
き出し手段を備えて型開きと同時にキャビティプレート
側の突き出しピンを突き出すことにより強制的に成型品
をキャビティプレートから剥離してコア側に残し、この
後コア側の突き出しピンを突き出すことによって成型品
をコアプレートから離型させることが行われている。し
かし、これはキャビティプレート側に突き出しピン、突
き出し板および突き出し板を作動させるための油圧機構
を装備しなければならず構造が複雑になり高価になると
いう問題点がある。[Problems to be Solved by the Invention] In the injection molding die of the prior art, the resin molded product is usually left on the core side by adjusting draft or intentionally providing an undercut on the molded product. However, depending on the shape of the molded product, the molded product may not remain on the core side even by these means.To address such a problem, the cavity plate side is also equipped with a protruding means to open the mold. At the same time, eject the protruding pin on the cavity plate side to forcibly separate the molded product from the cavity plate and leave it on the core side, and then eject the protruding pin on the core side to release the molded product from the core plate. Is being done. However, this has a problem in that the cavity plate side must be equipped with a protrusion pin, a protrusion plate, and a hydraulic mechanism for operating the protrusion plate, which makes the structure complicated and expensive.
本発明は、前記従来の問題点を解決するもので、突き
出しピンによる突き出し手段を設けることなくキャビテ
ィ側から成形品を剥離させることができる射出成形用金
型のバルブゲート制御方法を提供することを目的とす
る。The present invention solves the above-mentioned conventional problems, and provides a valve gate control method for an injection molding die capable of separating a molded product from the cavity side without providing a protrusion means by a protrusion pin. To aim.
［課題を解決するための手段］ 前記目的を達成するために本発明の射出成形用金型の
バルブゲート制御方法はキャビティ内に溶融樹脂を射出
するためにバルブを後退してゲート開口を行う行程と、
キャビティの樹脂を冷却するためにバルブを前進してゲ
ートシールを行う行程と、成形品を突き出すために型開
きと同時にバルブをゲート前方まで前進させる行程と、
ゲートを後退して復帰させる行程とから構成されるもの
である。[Means for Solving the Problems] In order to achieve the above object, the valve gate control method for an injection molding die according to the present invention is a step of retreating a valve to open a gate to inject a molten resin into a cavity. When,
The process of advancing the valve to cool the resin in the cavity and performing gate sealing, and the process of advancing the valve to the front of the gate at the same time as the mold opening to eject the molded product,
The process is to move the gate back and back.
［作用］ 本発明の射出成形用金型のバルブゲート制御方法にお
いては、バルブの後退により射出が行われ、射出完了後
バルブの１段目の前進によりキャビティ内の樹脂の冷却
が行われ、次にバルブの２段目の前進により成型品の突
き出しが行われ、この後バルブの後退により復帰が行わ
れる。[Operation] In the valve gate control method for the injection molding die of the present invention, injection is performed by retreating the valve, and after completion of injection, the resin in the cavity is cooled by the first advance of the valve. Then, the molded product is ejected by advancing the second stage of the valve, and then returned by retreating the valve.
［実施例］ 以下、本発明の一実施例を図面を用いて具体的に説明
する。Embodiment An embodiment of the present invention will be specifically described below with reference to the drawings.
まず本発明に用いられる射出成形用金型を第１図を参
照して説明する。この射出成形用金型は互い突き合わさ
れたキャビティプレート１とコアプレート２とを備え、
これら両プレート1,2の突き合わせ部にキャビティ３が
形成されるとともに、このキャビティ３内に溶融樹脂を
射出するためのバルブゲート４がキャビティプレート１
側に設けられ、コア側に残った樹脂成形品を突き出すた
めの突き出しピン5Aと突き出し板5Bからなる突き出し手
段５がコア側に設けられている。このような射出成形用
金型は前記キャビティプレート１を固定側取り付け板６
に固定するとともに前記コアプレート２を可動側取り付
け板７に固定して配設され両取り付け板6,7によって型
締めされるようになっている。バルブゲート４はキャビ
ティプレート１と固定側取り付け板６との間に配設され
たマニホールド８に嵌着されており、ノズルタッチ９か
らマニホールド８に形成された樹脂の通路10およびバル
ブゲート４内の樹脂の通路11を通ってゲートより射出さ
れるようになっている。バルブゲート４内にはカートリ
ッジヒータ12が組み込まれており、このカートリッジヒ
ータ12の中央には貫通孔13が形成されている。バルブゲ
ート４の中央には先端にバルブ14を有するバルブピン15
が設けられており、このバルブピン15はカートリッジヒ
ータ12の貫通孔13およびマニホールド８を貫挿してその
基端のピストン16が固定側取り付け板６内に設けられた
油圧シリンダ17内に配設されているとともにゲートはバ
ルブ14をゲート前方に突出できるように形成されてい
る。油圧シリンダ17を駆動制御する油圧制御系としては
油圧ポンプ18、切替弁19および制御装置20があり、図示
しないセンサによりバルブピン15の位置を検出して制御
装置20に位置検知信号を入力している。このセンサは例
えばバルブピン15とともにラックを進退させ、このラッ
クに噛合するピニオンと同軸にポテンショメータを設
け、ポテンショメータから出力する電圧信号を制御装置
20に入力させたり、油圧シリンダ17の油圧を圧力センサ
で検出して入力させたりする。成形品としてはキャビテ
ィプレート１から剥離し難いもの例えば薄肉フランジ部
21と軸筒部22からなるテープリール用のハブ23を例にす
る。First, the injection mold used in the present invention will be described with reference to FIG. The injection molding die includes a cavity plate 1 and a core plate 2 that are butted against each other.
A cavity 3 is formed at the abutting portion of both plates 1 and 2, and a valve gate 4 for injecting molten resin into the cavity 3 is provided with a cavity plate 1.
Is provided on the core side, which is provided on the core side and includes a protrusion pin 5A and a protrusion plate 5B for ejecting the resin molded product remaining on the core side. In such an injection molding die, the cavity plate 1 is attached to the fixed side mounting plate 6
The core plate 2 is fixedly mounted on the movable side mounting plate 7 and clamped by both mounting plates 6 and 7. The valve gate 4 is fitted in a manifold 8 arranged between the cavity plate 1 and the fixed side mounting plate 6, and the resin passage 10 formed in the manifold 8 from the nozzle touch 9 and the valve gate 4 It is designed to be injected from a gate through a resin passage 11. A cartridge heater 12 is incorporated in the valve gate 4, and a through hole 13 is formed in the center of the cartridge heater 12. A valve pin 15 having a valve 14 at the tip at the center of the valve gate 4.
The valve pin 15 is inserted through the through hole 13 of the cartridge heater 12 and the manifold 8, and the piston 16 at the base end thereof is disposed in the hydraulic cylinder 17 provided in the fixed side mounting plate 6. At the same time, the gate is formed so that the valve 14 can be projected forward of the gate. As a hydraulic control system for driving and controlling the hydraulic cylinder 17, there are a hydraulic pump 18, a switching valve 19 and a control device 20, which detects the position of the valve pin 15 by a sensor (not shown) and inputs a position detection signal to the control device 20. . This sensor, for example, advances and retracts a rack together with a valve pin 15, a potentiometer is provided coaxially with a pinion meshing with the rack, and a voltage signal output from the potentiometer is controlled by a controller.
20 or the hydraulic pressure of the hydraulic cylinder 17 is detected by a pressure sensor and input. A molded product that is difficult to peel off from the cavity plate 1, such as a thin flange
An example is a tape reel hub 23 composed of 21 and a shaft tube portion 22.
次に本発明によるバルブゲートのバルブ制御方法につ
いて第２図〜第６図を参照して説明する。Next, a valve control method of the valve gate according to the present invention will be described with reference to FIGS.
まず、第３図に示すように型締状態において、バルブ
ピン15を後退させることによりゲート開口動作を行い、
ゲートから溶融樹脂をキャビティ３内に射出する（ステ
ップ１）。First, as shown in FIG. 3, in the mold clamping state, the gate opening operation is performed by retracting the valve pin 15.
Molten resin is injected from the gate into the cavity 3 (step 1).
射出完了後、第４図に示すようにバルブピン15を１段
目まで前進させることによりゲートシール動作を行い、
キャビティ３内の樹脂を冷却する（ステップ２）。After the injection is completed, the gate seal operation is performed by advancing the valve pin 15 to the first stage as shown in FIG.
The resin in the cavity 3 is cooled (step 2).
樹脂凝固後、第５図に示すように可動側取り付け板７
の降下による型開きと同時にバルブピン15を２段目つま
りゲート前方まで前進させることによりキャビティ３内
の成形品であるハブ23をキャビティプレート１から剥離
させる（ステップ３）。After the resin is solidified, as shown in FIG.
At the same time as the mold is opened by lowering the valve pin 15, the valve pin 15 is advanced to the second stage, that is, to the front of the gate, so that the hub 23 which is a molded product in the cavity 3 is separated from the cavity plate 1 (step 3).
つぎにバルブピン15を第６図に示すように後退させる
ことによりゲートシール状態に復帰させる（ステップ
４）。Next, the valve pin 15 is retracted as shown in FIG. 6 to restore the gate-sealed state (step 4).
以上の動作中第５図および第６図におけるバルブピン
15の停止の制御はセンサからの位置検出信号に基づき制
御装置20が切替弁19を制御することにより行われるが、
センサを用いる代りに油圧シリンダ17内に適宜な手段に
より出没作動するストッパを二段設けて停止位置を規制
することもできる。また油圧シリンダ17に代えてエアシ
リンダを用いることもできる。During the above operation, the valve pin in FIGS. 5 and 6
Control of stop of 15 is performed by the control device 20 controlling the switching valve 19 based on the position detection signal from the sensor,
Instead of using the sensor, it is possible to regulate the stop position by providing two stages of stoppers in the hydraulic cylinder 17 which are operated to move in and out by appropriate means. An air cylinder can be used instead of the hydraulic cylinder 17.
以上のバルブゲート制御方法によれば、バルブゲート
４のバルブ14を用いて成形品をキャビティプレート１か
ら剥離させることができるため、キャビティプレート１
側に設けられる突き出しピン、突き出し板、油圧機構か
らなる複雑な突き出し手段を省略することができ構造簡
単で安価な成形金型を得ることができる。According to the above valve gate control method, the molded product can be separated from the cavity plate 1 by using the valve 14 of the valve gate 4.
It is possible to omit a complicated ejecting means including an ejecting pin, an ejecting plate, and a hydraulic mechanism provided on the side, so that a molding die having a simple structure and being inexpensive can be obtained.
なお本発明は上記実施例に限定されるものではなく本
発明の要旨の範囲内において種々の変形実施が可能であ
る。例えばバルブゲートを備えた射出成形用金型は種々
のタイプに適用することができる。The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, an injection mold provided with a valve gate can be applied to various types.
［発明の効果］ 本発明はキャビティ内に溶融樹脂を射出するためにバ
ルブを後退してゲート開口を行う行程と、キャビティの
樹脂を冷却するためにバルブを前進してゲートシールを
行う行程と、成形品を突き出すために型開きと同時にバ
ルブをゲート前方まで前進させる行程と、ゲートを後退
して復帰させる行程とからなり、突き出しピンによる突
き出し手段を設けることなくキャビティ側から成形品を
剥離させることができる射出成形用金型のバルブゲート
制御方法を提供できる。[Advantages of the Invention] According to the present invention, a step of retreating a valve to inject a molten resin into a cavity to open a gate, and a step of advancing the valve to cool the resin in the cavity to perform a gate seal, It consists of a process of advancing the valve to the front of the gate at the same time as opening the mold in order to eject the molded product, and a process of retracting and returning the gate, and peeling the molded product from the cavity side without providing ejection means by an ejection pin. It is possible to provide a valve gate control method for an injection molding die capable of performing the above.
第１図〜第７図は本発明の一実施例を示し、第１図はバ
ルブゲートを備えた射出成形用金型を示す断面図、第２
図はバルブゲートのバルブ動作を示すフローチャート、
第３図〜第６図はバルブ動作順序を示す断面図、第７図
は成型品の斜視図である。 ３…キャビティ ４…バルブゲート 14…バルブ1 to 7 show an embodiment of the present invention, and FIG. 1 is a cross-sectional view showing an injection molding die having a valve gate, and FIG.
The figure is a flow chart showing the valve operation of the valve gate.
3 to 6 are sectional views showing the sequence of valve operation, and FIG. 7 is a perspective view of a molded product. 3 ... Cavity 4 ... Valve gate 14 ... Valve
Claims (1)
バルブを後退してゲート開口を行う行程と、キャビティ
の樹脂を冷却するためにバルブを前進してゲートシール
を行う行程と、成形品を突き出すために型開きと同時に
バルブをゲート前方まで前進させる行程と、ゲートを後
退して復帰させる行程とから構成されることを特徴とす
る射出成形用金型のバルブゲート制御方法。1. A process of retracting a valve to inject a molten resin into a cavity to open a gate, a process of advancing a valve to cool resin in a cavity to perform a gate seal, and a molded product. A valve gate control method for an injection molding die, comprising: a process of advancing a valve forward of a gate at the same time as opening a mold for ejection, and a process of retracting and returning the gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2293384A JP2692369B2 (en) | 1990-10-29 | 1990-10-29 | Valve gate control method for injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2293384A JP2692369B2 (en) | 1990-10-29 | 1990-10-29 | Valve gate control method for injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04164618A JPH04164618A (en) | 1992-06-10 |
| JP2692369B2 true JP2692369B2 (en) | 1997-12-17 |
Family
ID=17794075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2293384A Expired - Fee Related JP2692369B2 (en) | 1990-10-29 | 1990-10-29 | Valve gate control method for injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2692369B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6214275B1 (en) * | 1999-06-04 | 2001-04-10 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
| USRE38480E1 (en) * | 1999-06-04 | 2004-03-30 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
| DE102011080054A1 (en) * | 2011-07-28 | 2013-01-31 | Zf Friedrichshafen Ag | Injection head and ejector of an injection device |
-
1990
- 1990-10-29 JP JP2293384A patent/JP2692369B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04164618A (en) | 1992-06-10 |
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