JP2003039485A - Mold for composite injection molding - Google Patents
Mold for composite injection moldingInfo
- Publication number
- JP2003039485A JP2003039485A JP2001229961A JP2001229961A JP2003039485A JP 2003039485 A JP2003039485 A JP 2003039485A JP 2001229961 A JP2001229961 A JP 2001229961A JP 2001229961 A JP2001229961 A JP 2001229961A JP 2003039485 A JP2003039485 A JP 2003039485A
- Authority
- JP
- Japan
- Prior art keywords
- molding
- primary
- runner
- resin
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一次成形品の一部
に二次成形品あるいはそれ以上の成形品を段階的に形成
する所謂射出成形用金型（以下この金型を「複合射出成
形用金型」と称する）であって、更に詳しくは、一次成
形品成形用キャビティ及び二次並びに三次成形品成形用
キャビティが多点ゲートを採用し、この多点ゲートから
各キャビティ内に樹脂を充填する構成の複合射出成形用
金型に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called injection molding die (hereinafter referred to as "composite injection molding") in which a secondary molded article or more molded articles are formed stepwise on a part of the primary molded article. For more details, the primary molding product molding cavity and the secondary and tertiary molding product molding cavities employ multi-point gates, and from this multi-point gate resin is injected into each cavity. The present invention relates to a composite injection molding die configured to be filled.
【０００２】[0002]
【従来の技術】従来の射出工程を二回行うことで、複雑
な形状の成形品を得る、または、異材、多色の成形品を
得る所謂多色射出成形においては、一方のゲートから溶
融樹脂をキャビティ内に充填し、冷却固化（一次成形）
させた後に、少なくともキャビティの一部を移動し、一
次成形品の一部に二次成形用の空間、つまり二次キャビ
ティを形成させた後、この形成された空間へ溶融樹脂を
充填して、冷却固化（二次成形）させた後に、成形品を
取りだす方法が用いられて来た。2. Description of the Related Art In conventional so-called multicolor injection molding, in which a molded product having a complicated shape is obtained by performing a conventional injection process twice, or a molded product of different materials or multicolors is obtained, a molten resin is applied from one gate. Is filled in the cavity and solidified by cooling (primary molding)
After that, at least a part of the cavity is moved to form a space for secondary molding in a part of the primary molded product, that is, a secondary cavity is formed, and then the formed space is filled with molten resin, A method has been used in which a molded product is taken out after being cooled and solidified (secondary molding).
【０００３】[0003]
【発明が解決しようとする課題】しかし、ピンゲートに
代表される３枚金型構造を利用した成形においては、一
次成形後、および二次成形後それぞれの工程において、
スプルー取り出し工程が必要であり、このスプルー取り
出しは二回行うため、この取り出し工程分成形サイクル
タイムが長くなると云う問題があった。However, in molding using a three-piece mold structure represented by a pin gate, in each step after primary molding and after secondary molding,
Since the sprue take-out step is required, and the sprue take-out step is performed twice, there is a problem that the molding cycle time becomes long for the take-out step.
【０００４】また、ダイレクトサイドゲートに代表され
る２枚金型構造を利用した成形においては、一次成形に
おけるランナーが存在するために、二次成形用ランナー
は一次成形用ランナーを回避する必要があり、レイアウ
トおよび二次成形用のゲート位置に制約が発生し、必ず
しも最適な位置にゲートやランナーを設定することは出
来なかった。このため、フローバランスが悪い状態で、
一次、二次も含めて溶融樹脂をキャビティ内に充填する
こととなり、ヒケ、バリ等の成形不良が多発する要因と
なっていた。本発明は斯る点に鑑みて提案されるもので
あって、その目的は、複数ゲート及びランナーをバラン
スよくレイアウトしてフローバランスをとり、ヒケやバ
リ等の成形不良が発生しない複合射出成形用金型を提供
することである。Further, in the molding using the two-die structure represented by the direct side gate, since there is a runner in the primary molding, the secondary molding runner needs to avoid the primary molding runner. However, there were restrictions on the layout and the gate position for secondary molding, and it was not always possible to set the gate or runner at the optimum position. Therefore, when the flow balance is poor,
The molten resin including the primary and secondary resin is filled in the cavity, which is a cause of frequent molding defects such as sink marks and burrs. The present invention is proposed in view of the above point, and an object thereof is to perform a flow balance by laying out a plurality of gates and runners in a well-balanced manner, and for composite injection molding in which molding defects such as sink marks and burrs do not occur. It is to provide the mold.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、請求項１に記載の発明においては、一次成形品の一
部に二次成形品を一体に形成するための複合射出成形用
金型において、前記金型の分割面に一次成形品成形用キ
ャビティ及びこのキャビティ内に樹脂を充填するための
一次ゲートと、これに続く一次ランナー及び二次成形品
成形用キャビティ内に樹脂を充填するための二次ゲート
と、これに続く二次ランナーを形成すると共に前記一次
ランナーと二次ランナーは一部において交差するように
形成したこと、前記ランナーの交差部には深溝を形成
し、一次成形品成形用キャビティ内に樹脂を充填すると
きには、この深溝の最深部を経由して一次ランナー→一
次ゲート→一次成形品成形用キャビティと樹脂を流動さ
せ、二次成形品成形用キャビティ内に樹脂を充填すると
きには、前記深溝部分に一次充填時の樹脂を残留固化さ
せて深溝の最深部を閉塞した上、この閉塞した樹脂上に
おいて二次ランナーから二次ゲートに至る流路を開通し
て二次成形品成形用キャビティ内に樹脂を充填するラン
ナー交差部制御手段を設けたことを特徴とするものであ
る。In order to achieve the above object, in the invention described in claim 1, a mold for composite injection molding for integrally forming a secondary molded product on a part of the primary molded product. In order to fill the resin into the cavity for molding the primary molded product and the resin in the cavity on the divided surface of the mold, and the subsequent primary runner and the cavity for molding the secondary molded product. The secondary gate and the secondary runner subsequent thereto are formed, and the primary runner and the secondary runner are formed so as to partially intersect each other. A deep groove is formed at the intersection of the runner to form a primary molded product. When the resin is filled in the molding cavity, the primary runner → primary gate → primary molding product molding cavity and resin flow through the deepest part of this deep groove to mold the secondary molding product. When the resin is filled in the cavity, the deep groove portion is left to solidify the resin at the time of primary filling to close the deepest portion of the deep groove, and the flow path from the secondary runner to the secondary gate is closed on the closed resin. The invention is characterized in that runner intersection control means for opening the secondary molding product molding cavity to fill the resin is provided.
【０００６】更に、請求項２に記載の発明においては、
請求項１に記載の発明において、一次、二次成形品成形
用キャビティに合わせて、三次成形品成形用キャビティ
を形成する場合には、各キャビティのゲートに至るラン
ナーを共通の深溝で交差させると共にランナー交差部制
御手段を、一次ランナーを経由して樹脂を一次成形品成
形用キャビティ内に充填する場合には、深溝の最深部を
経由して樹脂が流動し、二次ランナーを経由して樹脂を
二次成形品成形用キャビティ内に充填する場合には、前
記深溝において、最深部に残留固化している一次ランナ
ー内の残留固化樹脂上を経由して樹脂が流動し、三次ラ
ンナーを経由して三次成形品成形用キャビティ内に樹脂
を充填する場合には、前記深溝において、二次ランナー
内の残留固化樹脂上を経由して樹脂が流動するように制
御することを特徴とするものである。Further, in the invention described in claim 2,
In the invention as set forth in claim 1, when the cavity for molding the tertiary molded product is formed in conformity with the cavity for molding the primary and secondary molded products, the runners reaching the gates of the respective cavities are crossed with a common deep groove. When the runner intersection control means is used to fill the resin into the molding cavity for the primary molded product via the primary runner, the resin flows through the deepest part of the deep groove and the resin flows through the secondary runner. In the deep groove, the resin flows through the residual solidified resin in the primary runner that is solidified in the deepest part in the deep groove, and the resin flows through the tertiary runner. When the resin is filled into the molding cavity of the tertiary molded product, the resin is controlled so that the resin flows in the deep groove via the residual solidified resin in the secondary runner. It is intended to.
【０００７】更に、請求項３に記載の発明においては、
請求項１又は２に記載の発明において、ランナー交差部
制御手段は、深溝に対向する金型側から出入りして深溝
内に収まり、一次又は二次又は三次ランナーの流れ方向
を制御する突起であって、この突起は、駆動装置により
出入りが制御されるように構成されていることを特徴と
するものである。Further, in the invention described in claim 3,
In the invention according to claim 1 or 2, the runner intersection control means is a protrusion that enters and exits from the mold side facing the deep groove, is housed in the deep groove, and controls the flow direction of the primary, secondary, or tertiary runner. The projection is characterized in that the drive device controls the entrance and exit.
【０００８】[0008]
【作用】先ず、一次成形品の成形に際しては、ランナー
交差部制御手段を駆動してランナー交差部に形成された
深溝の最深部のみを開通させ、二次ランナー及び二次ゲ
ート側を閉塞する。この結果、一次成形用射出ユニット
から供給された溶融樹脂は、一次ランナー→深溝最深部
→一次ランナー→一次ゲート→一次成形品成形用キャビ
ティ内と流動し、一次成形品成形用キャビティ内に充填
され、保圧→冷却を経て一次成形品が成形される。First, when molding the primary molded product, the runner intersection control means is driven to open only the deepest part of the deep groove formed in the runner intersection, and the secondary runner and the secondary gate side are closed. As a result, the molten resin supplied from the primary molding injection unit flows through the primary runner → deepest groove deepest part → primary runner → primary gate → primary molding product molding cavity and is filled in the primary molding product molding cavity. The primary molded product is molded after holding pressure → cooling.
【０００９】次に、二次成形品を成形する場合には、金
型の一方が入れ換わり、一次成形品の一部とこの入れ換
わった金型との間に二次成形品成形用キャビティが形成
するか、または、一方の金型の一部が移動して二次成形
品成形用キャビティが形成される。さらに、ランナー交
差部制御手段が作動して深溝において最深部の上に二次
ランナー開通空間を形成する。このとき、深溝の最深部
と一次ランナー内には冷却固化した樹脂がそのまま残留
していて一次ランナー及び深溝の最深部は塞がれてい
る。Next, when the secondary molded product is molded, one of the molds is replaced, and a cavity for molding the secondary molded product is formed between a part of the primary molded product and the replaced mold. It is formed or a part of one of the molds is moved to form a cavity for molding the secondary molded product. Further, the runner intersection control means operates to form the secondary runner opening space above the deepest portion in the deep groove. At this time, the resin that has been cooled and solidified remains in the deepest part of the deep groove and in the primary runner, and the deepest part of the primary runner and the deep groove is blocked.
【００１０】二次成形用射出ユニットから二次ランナー
に樹脂が充填されるとこの樹脂は二次ランナー→深溝→
二次ランナー→二次ゲートを経由して二次成形品成形用
キャビティ内に充填され、保圧→冷却を経て二次成形品
が一次成形品の一部に一体に成形される。又は、一次成
形品が２個の場合には、この２個の一次成形品を結合す
るように二次成形品が形成される。When the secondary runner is filled with the resin from the secondary molding injection unit, the resin runs in the secondary runner → deep groove →
Secondary runner → It is filled into the cavity for molding the secondary molded product via the secondary gate, and the secondary molded product is molded integrally with a part of the primary molded product through holding pressure → cooling. Alternatively, when the number of primary molded products is two, the secondary molded product is formed so as to join the two primary molded products.
【００１１】[0011]
【実施例１】本発明の実施例１として、２シリンダー成
形機を使用し、ダイレクトサイドゲートによる２枚金型
であり、コアバック機構による二色成形金型を使用した
場合の例を以下に説明する。図１は、可動側金型１ａの
正面図である。なお、図１においては、説明を簡素化す
るために、固定側金型の図を省略した。Example 1 As Example 1 of the present invention, a two-cylinder molding machine is used, a two-sided mold with a direct side gate, and a two-color molding mold with a core back mechanism is used. explain. FIG. 1 is a front view of the movable mold 1a. Note that, in FIG. 1, the illustration of the fixed-side mold is omitted in order to simplify the description.
【００１２】この可動側金型１ａの分割面には、一次成
形品成形用キャビティ２ａと、一次ランナー３ａ、３ｂ
および、二次ランナー４ａ、４ｂが形成されている。ま
た、一次ランナー３ａと二次ランナー３ｂが交差する共
有ランナー部分には深溝５が形成されていて、この深溝
５は、一次ランナー３ａ、３ｂおよび、二次ランナー４
ａ、４ｂの他の部分の溝深に比較して、約２倍の深さに
加工されている。一方、固定側金型１ｂには、図２に示
すように、ランナー交差部制御手段としての突起６が存
在し、この突起６は例えば油圧シリンダー（図示せず）
により上下動（前進、後退）自在に制御されて前記深溝
５を最深部から段階的に開放して一次、二次ランナーの
開通を切り換えることができる構造となっている。A cavity 2a for molding the primary molded product and primary runners 3a, 3b are provided on the divided surface of the movable side mold 1a.
And the secondary runners 4a and 4b are formed. Further, a deep groove 5 is formed in the shared runner portion where the primary runner 3a and the secondary runner 3b intersect, and this deep groove 5 is formed by the primary runners 3a and 3b and the secondary runner 4.
The groove depth is about twice as large as the groove depth of the other portions of a and 4b. On the other hand, as shown in FIG. 2, the fixed mold 1b has a protrusion 6 as a runner intersection control means, and this protrusion 6 is, for example, a hydraulic cylinder (not shown).
By this, the deep groove 5 is controlled to move up and down (forward and backward) freely, and the deep groove 5 is opened stepwise from the deepest portion to switch the opening of the primary and secondary runners.
【００１３】この金型を用いて一次成形品の一部に二次
成形品を一体に形成する複合成形を行う場合には、初め
に、可動側金型１ａと、一部に突起６を持つ固定側金型
１Ｂを重ね合わせ、金型を閉じる。一次成形用射出ユニ
ット９ａより、一次成形用溶融樹脂を一次ランナー３ａ
へ充填し、一次ゲート７ａ及び一次ゲート７ｂを経て、
一次成形品成形用キャビティ２ａへ樹脂を充填する。そ
の時、溶融樹脂は、一次ランナー３ａを経由して一次成
形品成形用キャビティ２ａ内に充填されるが、固定側金
型の突起６が深溝５において二次ランナー４ａ及び二次
ランナー４ｂを閉鎖しているため、二次ゲート８ａ、８
ｂ側には流動しない。When performing composite molding in which a secondary molded product is integrally formed on a part of a primary molded product by using this mold, first, a movable mold 1a and a projection 6 are partially provided. The stationary mold 1B is overlaid and the mold is closed. From the primary molding injection unit 9a, the primary molding molten resin is transferred to the primary runner 3a.
Filled in, through the primary gate 7a and the primary gate 7b,
Resin is filled into the cavity 2a for molding the primary molded product. At that time, the molten resin is filled into the cavity 2a for molding the primary molded product via the primary runner 3a, but the protrusion 6 of the stationary mold closes the secondary runner 4a and the secondary runner 4b in the deep groove 5. The secondary gates 8a, 8
Does not flow on the b side.
【００１４】図２は、図１のＡ−Ａ部断面の様子を示す
もので、ランナーが交差する深溝５の一部に、固定側金
型１Ｂに存在する突起６の先端６ａが入り込んでいる
が、一次射出ユニット９ａから、一次ランナー３ａ、３
ｂ、一次ゲート７ａ、７ｂ、一次成形品成形用キャビテ
ィ２ａまでは、流路が連通しているため、一次成形用射
出ユニット９Ａから注入された溶融樹脂は２点のゲート
７ａ、７ｂから一次成形品成形用キャビティ２ａ内へ流
動することができる。FIG. 2 shows a cross-sectional view taken along the line AA of FIG. 1, in which a tip 6a of a protrusion 6 existing on the stationary mold 1B is inserted into a part of the deep groove 5 where the runner intersects. From the primary injection unit 9a to the primary runners 3a, 3
b, the primary gates 7a, 7b and the cavity 2a for molding the primary molded product are in communication with the flow path, so that the molten resin injected from the injection unit 9A for the primary molding is subjected to the primary molding from the two gates 7a, 7b. It can flow into the product forming cavity 2a.
【００１５】一方、図３に図１のＢ−Ｂ部断面の様子を
示す。深溝５の一部に、固定側金型１ｂに存在する突起
６の先端６ａが入り込んでおり、二次ランナー４ｂの一
部を封鎖しているため、一次成形用射出ユニット９ａか
ら注入された溶融樹脂は二次ランナー４ａ、４ｂ、及び
二次ゲート８ａ、８ｂ側に流動することは無い。一次成
形品成形用キャビティ２ａ内の溶融樹脂を十分に冷却固
化させることにより、一次成形を完了する。この時、一
次ランナー３ａ、３ｂ及び深溝５内においても残留した
樹脂が固化して残っている。次に、固定側金型１Ｂの突
起６の先端６ａを図４において矢印で示すように固定側
金型１ｂの分割面まで後退させて二次ランナー４ｂを開
通する。この時、深溝５の最深部５ａには一次成形時に
流動した残留樹脂が塊１１となって残っている。また、
突起６の後退に併せて一次成形品成形用キャビティ２ａ
の一部と接するコアバック入れ駒１０を後退させる。On the other hand, FIG. 3 shows a sectional view taken along line BB in FIG. Since the tip 6a of the projection 6 existing in the fixed-side mold 1b enters a part of the deep groove 5 and seals a part of the secondary runner 4b, the melt injected from the primary molding injection unit 9a is melted. The resin does not flow toward the secondary runners 4a and 4b and the secondary gates 8a and 8b. The primary molding is completed by sufficiently cooling and solidifying the molten resin in the cavity 2a for molding the primary molded article. At this time, the residual resin is solidified and remains in the primary runners 3 a and 3 b and the deep groove 5. Next, the tip 6a of the protrusion 6 of the fixed-side mold 1B is retracted to the dividing surface of the fixed-side mold 1b as shown by the arrow in FIG. 4, and the secondary runner 4b is opened. At this time, in the deepest portion 5a of the deep groove 5, the residual resin that has flowed during the primary molding remains as a lump 11. Also,
Cavity 2a for molding the primary molded product along with the retreat of the projection 6
The core back insertion piece 10 that is in contact with a part of is retracted.
【００１６】以上の状態を説明する図として、図１のＣ
−Ｃ断面図を図４に示す。深溝５の一部には、一次成形
樹脂が固化した樹脂塊１１が残留しているが、突起６が
後退したため、二次ランナー４ｂが開通状態となる。こ
の結果、二次成形用射出ユニット９ｂから、二次ランナ
ー４ａ、４ｂ、二次ゲート８ａ、８ｂ、二次成形品成形
用キャビティ２ｂまで連続した流路空間が形成されるた
め、二次成形用溶融樹脂は、二次成形品成形用キャビテ
ィ２ｂ内へ流動し、充填される。As a diagram for explaining the above state, C in FIG.
The -C sectional view is shown in FIG. A resin mass 11 in which the primary molding resin has solidified remains in a part of the deep groove 5, but the secondary runner 4b is opened because the projection 6 has receded. As a result, a continuous flow path space is formed from the secondary molding injection unit 9b to the secondary runners 4a and 4b, the secondary gates 8a and 8b, and the secondary molded article molding cavity 2b. The molten resin flows and is filled into the cavity 2b for molding the secondary molded product.
【００１７】このようにして得られた一次成形品の一部
に二次成形品を一体に形成した複合成形品を図５に、図
５においてＤ−Ｄ部の複合成形品における断面図を図６
に示す。この実施例においては、一次成形品１３にポリ
プロピレン、二次成形品１４にオレフィン系エラストマ
ーを使用することで、一次ランナー残留固化樹脂塊１１
と二次ランナー残留固化樹脂塊１２は、深溝５の部分に
おいて互いに融着し、一体化されていると同時に、成形
品部分においても一次成形品１３の開口部輪郭に二次成
形品１４が十分に溶着され、異材一体の複合成形品を得
ることができた。以上の説明で明確であるように、一次
ランナー３ａ、３ｂのレイアウトの制約を受けずに、二
次ランナー４ａ、４ｂと二次ゲート８ａ、８ｂのレイア
ウトが可能であり、二次成形品の微細な形状末端まで樹
脂を均一に充填することができる。FIG. 5 shows a composite molded product in which a secondary molded product is integrally formed on a part of the primary molded product thus obtained, and FIG. 6
Shown in. In this example, by using polypropylene for the primary molded product 13 and an olefin elastomer for the secondary molded product 14, the primary runner residual solidified resin mass 11
The secondary runner residual solidified resin block 12 and the secondary runner residual solidified resin mass 12 are fused and integrated with each other in the deep groove portion 5, and at the same time, in the molded product portion, the secondary molded product 14 has a sufficient opening contour of the primary molded product 13. It was possible to obtain a composite molded product in which the dissimilar materials were integrated by welding. As is clear from the above description, the layout of the secondary runners 4a and 4b and the secondary gates 8a and 8b is possible without being restricted by the layout of the primary runners 3a and 3b, and the fineness of the secondary molded product can be obtained. The resin can be evenly filled up to the end of the desired shape.
【００１８】[0018]
【比較例１】次に、実施例１の比較例１を以下に説明す
る。この比較例１は、図７に示すように、一次成形用
に、一次ランナー２３ａ、２３ｂ、一次ゲート２７ａ、
２７ｂを設けた場合、二次成形用のゲートを、一次ラン
ナー２３ａ、２３ｂ、一次ゲート２７ａ、２７ｂおよび
一次成形品成形キャビティ２２ａで囲まれる部分に設定
することは、一次と二次ランナーが途中で交差するため
にできない。すなわち、二次成形用ランナー２４ａとゲ
ート２８ａのために、二次成形用ゲート２８ａの位置に
制限が発生し、本比較例１においては、二次成形用ゲー
ト２８ａは一次ランナー２３ａ、２３ｂ、一次ゲート２
７ａ、２７ｂを回避する必要があるため、１箇所のみの
設定となった。これに伴い、二次成形のフローバランス
が悪くなり、二次成形品の一部に、バリおよびヒケが見
受けられた。Comparative Example 1 Next, Comparative Example 1 of Example 1 will be described below. In Comparative Example 1, as shown in FIG. 7, the primary runners 23a and 23b, the primary gate 27a,
When 27b is provided, it is necessary to set the gate for secondary molding in the part surrounded by the primary runners 23a, 23b, the primary gates 27a, 27b and the primary molded product molding cavity 22a. You can't because you intersect. That is, the position of the secondary molding gate 28a is restricted due to the secondary molding runner 24a and the gate 28a, and in the first comparative example, the secondary molding gate 28a includes the primary runners 23a, 23b, and the primary runners 23a, 23b. Gate 2
Since it is necessary to avoid 7a and 27b, only one location was set. Along with this, the flow balance of the secondary molding was deteriorated, and burrs and sink marks were found on a part of the secondary molded product.
【００１９】[0019]
【実施例２】次に、本発明の実施例２として、２シリン
ダー成形機を使用し、ダイレクトサイドゲートによる２
枚金型であり、固定側金型一部のスライド機構による複
合射出成形用金型を使用した場合の例を以下に説明す
る。尚、説明図のうち、正面図および図１１の鳥瞰図に
おいては、説明を簡素化するために固定側キャビティの
表示を省略している。[Embodiment 2] Next, as Embodiment 2 of the present invention, a two-cylinder molding machine is used, and a direct side gate
An example of a case of using a composite injection molding die which is a sheet die and has a slide mechanism of a part of the fixed side die will be described below. Incidentally, in the front view and the bird's-eye view of FIG. 11 among the explanatory views, the fixed side cavity is not shown for simplification of the description.
【００２０】図８に、金型の構造を示す。固定側金型３
１ｂには、固定側一次成形コアブロック３２ｃと固定側
二次成形コアブロック３２ｄが存在し、両キャビティを
包括する大きなスライド３１ｃが存在する。この金型を
用いて行う成形は、図９に示すように、スライド３１ｃ
は、油圧シリンダーにより上下に移動可能であり、一次
成形においては、固定側一次成形コアブロック３２ｃと
可動側キャビティブロック３２ａが重なり、二次成形に
おいては、固定側二次成形コアブロック３２ｄと可動側
キャビティブロック３２ａが重なる構造となっている。FIG. 8 shows the structure of the mold. Fixed mold 3
The fixed side primary molding core block 32c and the stationary side secondary molding core block 32d exist in 1b, and the large slide 31c which covers both cavities exists. As shown in FIG. 9, the slide 31c is used for molding using this mold.
Can be moved up and down by a hydraulic cylinder. In the primary molding, the fixed side primary molding core block 32c and the movable side cavity block 32a overlap each other, and in the secondary molding, the fixed side secondary molding core block 32d and the movable side. The cavity blocks 32a are structured to overlap.
【００２１】図１０に可動側金型３１ａの正面図、図１
１に、可動側金型３１ａの鳥瞰図を示す。可動側金型３
１ａは、可動側キャビティブロック３２ａと、一次ラン
ナー３３ａ、３３ｂおよび、二次ランナー３４ａ、３４
ｂを持つ。また、一次ランナー３３ａと二次ランナー３
４ａが重なる（交差）部分に、共有ランナーキャビティ
（深溝）３５が存在し、一次ランナー３３ａ、３３ｂお
よび二次ランナー３４ａ、３４ｂと比較して、この重な
る部分において溝の深さが深くなるように加工がなされ
ている。FIG. 10 is a front view of the movable side mold 31a, FIG.
1 shows a bird's-eye view of the movable die 31a. Movable mold 3
1a is a movable side cavity block 32a, primary runners 33a and 33b, and secondary runners 34a and 34a.
have b. In addition, the primary runner 33a and the secondary runner 3
There is a shared runner cavity (deep groove) 35 in the portion where 4a overlaps (intersects), and the depth of the groove becomes deeper in this overlapping portion as compared with the primary runners 33a and 33b and the secondary runners 34a and 34b. It is processed.
【００２２】一方、固定側金型３１ｂには、実施例１と
同様にシリンダー（図示せず）で駆動する突起３６が存
在し、一次成形においては、突起３６が、共有ランナー
キャビティ３５の一部をふさぐが、二次成形時には、突
起３６が後退して共有ランナーキャビティ３５の一部を
ふさがない構造となっている。On the other hand, the fixed mold 31b has a projection 36 driven by a cylinder (not shown) as in the first embodiment. In the primary molding, the projection 36 is a part of the shared runner cavity 35. However, during the secondary molding, the projection 36 is retracted so that a part of the shared runner cavity 35 is not blocked.
【００２３】この金型を用いて成形を行うには、初め
に、固定側一次成形コアブロック３２ｃと可動側キャビ
ティブロック３２ａが重なるように金型を閉じて一次成
形品成形用キャビティ６０を形成する。一次成形用射出
ユニット３９ａより、一次成形用溶融樹脂を一次ランナ
ー３３ａへ注入し、一次ゲート３７ａ及び一次ゲート３
７ｂを経て、一次成形品成形用キャビティ６０へ充填す
る。その時、溶融樹脂は、一次ランナー３３ａ、３３ｂ
を流動するが、固定側金型３１ｂの突起３６が存在する
ために、二次ランナー３４ａ及び二次ランナー３４ｂへ
は流動しない。To perform molding using this mold, first, the mold is closed so that the fixed-side primary molding core block 32c and the movable-side cavity block 32a overlap each other to form the cavity 60 for molding the primary molded product. . The molten resin for primary molding is injected into the primary runner 33a from the injection unit 39a for primary molding, and the primary gate 37a and the primary gate 3 are injected.
After 7b, the cavity 60 for molding the primary molded product is filled. At that time, the molten resin is used as the primary runners 33a, 33b.
, But does not flow to the secondary runner 34a and the secondary runner 34b due to the presence of the protrusion 36 of the stationary die 31b.
【００２４】図１２に、図１０のＡ−Ａ部断面の様子を
示した。共有ランナーキャビティ３５の溝の一部に、固
定側金型３１ｂ側から突起３６が入り込んでいるが、一
次射出ユニット３９ａから、一次ランナー３３ａ、３３
ｂ、一次ゲート３７ａ、３７ｂ、一次成形品成形用キャ
ビティ６０までは、流路が連通しているため、一次成形
用溶融樹脂を一次成形品成形用キャビティ６０へ充填す
ることができる。FIG. 12 shows a cross section taken along the line AA of FIG. The protrusion 36 is inserted into the groove of the common runner cavity 35 from the fixed side mold 31b side, but the primary runners 33a, 33 run from the primary injection unit 39a.
Since b, the primary gates 37a and 37b, and the cavity 60 for molding the primary molded product are in communication with each other, the molten resin for primary molding can be filled in the cavity 60 for molding the primary molded product.
【００２５】一方、図１３に図１０のＢ−Ｂ部断面の様
子を示した。共有ランナーキャビティ３５の溝の一部
に、突起３６が入り込んでおり、二次ランナー３４ｂの
一部を封鎖しているため、一次成形用溶融樹脂が二次ラ
ンナー３４ａ、３４ｂ、二次ゲート３８ａ、３８ｂへ充
填されることは無い。樹脂を充填した後、溶融樹脂を十
分に冷却固化させた後、金型を開き、一次成形を完了す
る。On the other hand, FIG. 13 shows a sectional view taken along line BB in FIG. Since the protrusion 36 is inserted into a part of the groove of the shared runner cavity 35 and closes a part of the secondary runner 34b, the molten resin for primary molding is the secondary runners 34a and 34b, the secondary gate 38a, 38b is never filled. After the resin is filled, the molten resin is sufficiently cooled and solidified, and then the mold is opened to complete the primary molding.
【００２６】次に、固定側金型のスライド３１ｃを移動
し、固定側二次成形コアブロック３２ｄと可動側キャビ
ティブロック３２ａが重なるように金型を閉じ、二次成
形品成形用キャビティ６１を形成する。以上の状態を説
明する図として、図１０のＣ−Ｃ断面図を図１４に示
す。Next, the slide 31c of the fixed-side mold is moved, and the mold is closed so that the fixed-side secondary molding core block 32d and the movable-side cavity block 32a overlap with each other to form the secondary-molded product molding cavity 61. To do. FIG. 14 is a cross-sectional view taken along line CC of FIG. 10 as a view for explaining the above state.
【００２７】二次成形品成形用キャビティ６１には、一
次成形成形品４１が存在する。また、共有ランナーキャ
ビティ３５の最深部には、一次成形樹脂が固化した樹脂
塊４０が残留している。二次成形においては、二次ラン
ナー３４ａ、３４ｂに突起３６が存在しないため、二次
射出ユニット３９ｂから、二次ランナー３４ａ、３４
ｂ、二次ゲート３８ａ、３８ｂ、二次成形品成形用キャ
ビティ６１まで、連続した流路が形成され、二次成形用
溶融樹脂を、二次成形品成形用キャビティ６１へ充填す
ることができる。The primary molded product 41 exists in the cavity 61 for molding the secondary molded product. Further, at the deepest portion of the shared runner cavity 35, a resin block 40 in which the primary molding resin has solidified remains. In the secondary molding, since the projections 36 do not exist on the secondary runners 34a, 34b, the secondary injection unit 39b transfers the secondary runners 34a, 34b.
b, a continuous flow path is formed up to the secondary gates 38a and 38b and the cavity 61 for molding the secondary molded product, and the molten resin for secondary molding can be filled in the cavity 61 for molding the secondary molded product.
【００２８】その後、溶融樹脂を十分に冷却固化させた
後、金型を開き、二次成形を完了する。二次成形完了後
に、成形品を取り出した状態を、図１５に示す。一次ラ
ンナー部の樹脂塊４０と二次ランナー内の樹脂塊４２
は、互いに融着し、一体化されていると同時に、一次成
形品４１と二次成形品４３も互いに融着し、一体化され
ている。以上の説明で明確であるように、一次ランナー
の制約を受けずに、二次ゲート及び二次ランナーの設定
（レイアウト）が可能であり、二次成形品部分にバリや
ヒケの無い良い複合成形品を得ることが出来た。Then, after the molten resin is sufficiently cooled and solidified, the mold is opened and the secondary molding is completed. FIG. 15 shows a state in which the molded product is taken out after the completion of the secondary molding. Resin mass 40 in the primary runner and resin mass 42 in the secondary runner
Are fused and integrated with each other, and at the same time, the primary molded product 41 and the secondary molded product 43 are also fused and integrated with each other. As is clear from the above description, it is possible to set (layout) the secondary gate and secondary runner without being restricted by the primary runner, and good composite molding without burr or sink mark on the secondary molded product part. I got the goods.
【００２９】[0029]
【比較例２】次に、実施例１と同じ成形品の成形法にお
いて、本発明を使用しない比較例２を、以下に説明す
る。図１６に示すように、一次成形用に、一次ランナー
５１、一次ゲート５０ａ、５０ｂを設けた場合、二次成
形用のゲートを、一次ランナー５１、一次ゲート５０
ａ、５０ｂおよび可動側キャビティブロック３２ａで囲
まれる部分に設定することができない。すなわち、二次
成形用ランナーとゲートのために、二次成形用ゲート位
置に制限が発生し、本比較例においては、二次成形用ゲ
ート５３は１箇所のみの設定となった。これに伴い、二
次成形のフローバランスが悪くなり、二次成形品の一部
に、バリおよびヒケが見受けられた。Comparative Example 2 Next, Comparative Example 2 in which the present invention is not used in the same molding method as in Example 1 will be described below. As shown in FIG. 16, when the primary runner 51 and the primary gates 50 a and 50 b are provided for the primary molding, the secondary molding gate is used as the primary runner 51 and the primary gate 50.
It cannot be set in a portion surrounded by a, 50b and the movable side cavity block 32a. That is, the secondary molding runner and the gate limited the secondary molding gate position, and in this comparative example, the secondary molding gate 53 was set at only one position. Along with this, the flow balance of the secondary molding was deteriorated, and burrs and sink marks were found on a part of the secondary molded product.
【００３０】[0030]
【発明の効果】本発明は以上のように、複合射出成形用
金型において、一次、二次成形品成形用キャビティのゲ
ートに至るランナーを金型の分割面に形成し、更にこの
ランナーを一部において交差させ、この交差部を深溝と
なし、この深溝の深さを突起等の制御手段で制御するこ
とにより、一次と二次成形品の成形において、一次から
二次ランナーへ流路を切り換えて開通させることができ
るようにした。この結果、ゲート及びランナーのレイア
ウトにおいて、すべてをバランス良く設計することが可
能となり、ヒケやバリのない、良質の複合成形品を得る
ことができた。As described above, according to the present invention, in a composite injection molding die, a runner reaching a gate of a cavity for molding a primary or secondary molded product is formed on a divided surface of the die, and the runner is In the molding of the primary and secondary molded products, the flow path is switched from the primary to the secondary runner by intersecting at the part and forming this deep part as a deep groove and controlling the depth of this deep groove by a control means such as a protrusion. So that it can be opened. As a result, the gate and runner layouts can be designed in a well-balanced manner, and a good quality composite molded product without sink marks and burrs can be obtained.
【図１】実施例１における可動側金型の正面図FIG. 1 is a front view of a movable mold according to a first embodiment.
【図２】図１におけるＡ−Ａ部断面図FIG. 2 is a sectional view taken along the line AA in FIG.
【図３】図１におけるＢ−Ｂ部断面図3 is a sectional view taken along line BB in FIG.
【図４】図１におけるＣ−Ｃ部断面図FIG. 4 is a sectional view taken along line CC in FIG.
【図５】実施例１により得られた成形品の説明図5 is an explanatory diagram of a molded product obtained in Example 1. FIG.
【図６】図５におけるＤ−Ｄ部の成形品における断面図6 is a cross-sectional view of a molded product of DD section in FIG.
【図７】比較例１における可動側金型の正面図FIG. 7 is a front view of a movable side mold in Comparative Example 1.
【図８】実施例２における金型の説明図FIG. 8 is an explanatory diagram of a mold according to the second embodiment.
【図９】実施例２における金型のスライドの説明図FIG. 9 is an explanatory diagram of a mold slide according to the second embodiment.
【図１０】実施例２における可動側金型の正面図FIG. 10 is a front view of a movable mold according to a second embodiment.
【図１１】可動側金型の鳥瞰図FIG. 11 is a bird's-eye view of the movable mold.
【図１２】図１０におけるＡ−Ａ部断面図12 is a sectional view taken along line AA in FIG.
【図１３】図１０におけるＢ−Ｂ部断面図13 is a sectional view taken along line BB in FIG.
【図１４】図１０におけるＣ−Ｃ部断面図FIG. 14 is a sectional view taken along line CC in FIG.
【図１５】実施例２により得られた成形品の説明図15 is an explanatory view of a molded product obtained in Example 2. FIG.
【図１６】比較例２における可動側金型の正面図16 is a front view of a movable mold according to Comparative Example 2. FIG.
２ａ、６０ 一次成形品成形用キャビティ ２ｂ、６１ 二次成形品成形用キャビティ ３ａ、３ｂ、３３ａ、３３ｂ 一次ランナー ４ａ、４ｂ、３４ａ、３４ｂ 二次ランナー ５，３５ 深溝（共有ランナーキャビティ） ６，３６ 突起 ７ａ、７ｂ、３７ａ、３７ｂ 一次ゲート ８ａ、８ｂ、３８ａ、３８ｂ 二次ゲート １３，４１ 一次成形品 １４，４３ 二次成形品 2a, 60 Cavity for molding primary molded products 2b, 61 Cavity for molding secondary molded product 3a, 3b, 33a, 33b Primary runner 4a, 4b, 34a, 34b Secondary runner 5,35 Deep groove (shared runner cavity) 6,36 protrusion 7a, 7b, 37a, 37b Primary gate 8a, 8b, 38a, 38b Secondary gate 13,41 Primary molded products 14,43 Secondary molded product
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F202 AA03 AA11 AA45 CA11 CB01 CB21 CK02 CK07 CK23 CK42 CK52 CK90 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 4F202 AA03 AA11 AA45 CA11 CB01 CB21 CK02 CK07 CK23 CK42 CK52 CK90
Claims (3)
形成するための複合射出成形用金型において、前記金型
の分割面に一次成形品成形用キャビティ及びこのキャビ
ティ内に樹脂を充填するための一次ゲートと、これに続
く一次ランナー及び二次成形品成形用キャビティ内に樹
脂を充填するための二次ゲートと、これに続く二次ラン
ナーを形成すると共に前記一次ランナーと二次ランナー
は一部において交差するように形成したこと、前記ラン
ナーの交差部には深溝を形成し、一次成形品成形用キャ
ビティ内に樹脂を充填するときには、この深溝の最深部
を経由して一次ランナー→一次ゲート→一次成形品成形
用キャビティと樹脂を流動させ、二次成形品成形用キャ
ビティ内に樹脂を充填するときには、前記深溝部分に一
次充填時の樹脂を残留固化させて深溝の最深部を閉塞し
た上、この閉塞した樹脂上において二次ランナーから二
次ゲートに至る流路を開通して二次成形品成形用キャビ
ティ内に樹脂を充填するランナー交差部制御手段を設け
たことを特徴とする複合射出成形用金型。1. A composite injection molding die for integrally forming a secondary molding product on a part of a primary molding product, wherein a cavity for molding the primary molding product and a resin in the cavity are formed on a dividing surface of the mold. A primary gate for filling the resin, a secondary gate for filling the primary runner and the secondary molding product molding resin with the secondary gate, and a secondary runner for the secondary gate, and a secondary gate for forming the secondary runner. The secondary runner is formed so as to intersect in part, a deep groove is formed at the intersection of the runners, and when the resin is filled in the cavity for molding the primary molded product, the primary runner passes through the deepest part of this deep groove. Runner → Primary gate → Primary molded product molding cavity and resin flow, and when the resin is filled into the secondary molded product molding cavity, the resin at the time of primary filling remains in the deep groove part. A runner intersection where the deepest part of the deep groove is closed by distilling and solidifying, and then the flow path from the secondary runner to the secondary gate is opened on this closed resin to fill the resin into the cavity for molding the secondary molded product. A composite injection molding die, characterized in that a control means is provided.
形用キャビティに合わせて、三次成形品成形用キャビテ
ィを形成する場合には、各キャビティのゲートに至るラ
ンナーを共通の深溝で交差させると共にランナー交差部
制御手段を、一次ランナーを経由して樹脂を一次成形品
成形用キャビティ内に充填する場合には、深溝の最深部
を経由して樹脂が流動し、二次ランナーを経由して樹脂
を二次成形品成形用キャビティ内に充填する場合には、
前記深溝において、最深部に残留固化している一次ラン
ナー内の残留固化樹脂上を経由して樹脂が流動し、三次
ランナーを経由して三次成形品成形用キャビティ内に樹
脂を充填する場合には、前記深溝において、二次ランナ
ー内の残留固化樹脂上を経由して樹脂が流動するように
制御することを特徴とする複合射出成形用金型。2. In claim 1, when forming a cavity for molding a tertiary molded article in conformity with a cavity for molding a primary molded article, a cavity for molding a tertiary molded article, the runners reaching the gates of the respective cavities intersect at a common deep groove. In addition, when the runner intersection control means is used to fill the resin into the cavity for molding the primary molded product via the primary runner, the resin flows through the deepest part of the deep groove, and then passes through the secondary runner. When filling the resin into the cavity for molding the secondary molded product,
In the deep groove, when the resin flows through the residual solidified resin in the primary runner that is residual solidified in the deepest part, and when the resin is filled in the cavity for molding the tertiary molded product via the tertiary runner, In the deep groove, the resin is controlled so as to flow through the residual solidified resin in the secondary runner so that the resin is controlled to flow.
段は、深溝に対向する金型側から出入りして深溝内に収
まり、一次又は二次又は三次ランナーの流れ方向を制御
する突起であって、この突起は、駆動装置により出入り
が制御されるように構成されていることを特徴とする複
合射出成形用金型。3. The runner intersection control means according to claim 1 or 2, wherein the runner intersecting portion control means is a projection that comes in and goes out from the mold side facing the deep groove, is housed in the deep groove, and controls the flow direction of the primary, secondary, or tertiary runner. In addition, the protrusion is configured to be controlled to move in and out by a driving device, and a composite injection molding die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229961A JP4009440B2 (en) | 2001-07-30 | 2001-07-30 | Composite injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229961A JP4009440B2 (en) | 2001-07-30 | 2001-07-30 | Composite injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003039485A true JP2003039485A (en) | 2003-02-13 |
| JP4009440B2 JP4009440B2 (en) | 2007-11-14 |
Family
ID=19062244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001229961A Expired - Fee Related JP4009440B2 (en) | 2001-07-30 | 2001-07-30 | Composite injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4009440B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101595A (en) * | 2007-10-23 | 2009-05-14 | Ube Machinery Corporation Ltd | Molding method and molding die for lamination-molded product |
| CN114347378A (en) * | 2021-12-31 | 2022-04-15 | 昆山市鸿毅达精密模具有限公司 | Double-color injection molding mold for automobile sealing strip |
-
2001
- 2001-07-30 JP JP2001229961A patent/JP4009440B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101595A (en) * | 2007-10-23 | 2009-05-14 | Ube Machinery Corporation Ltd | Molding method and molding die for lamination-molded product |
| CN114347378A (en) * | 2021-12-31 | 2022-04-15 | 昆山市鸿毅达精密模具有限公司 | Double-color injection molding mold for automobile sealing strip |
| CN114347378B (en) * | 2021-12-31 | 2023-09-26 | 昆山市鸿毅达精密模具有限公司 | Double-color injection molding mold for automobile sealing strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4009440B2 (en) | 2007-11-14 |
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