JP2011005819A - Injection mold - Google Patents

Injection mold Download PDF

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JP2011005819A
JP2011005819A JP2009153665A JP2009153665A JP2011005819A JP 2011005819 A JP2011005819 A JP 2011005819A JP 2009153665 A JP2009153665 A JP 2009153665A JP 2009153665 A JP2009153665 A JP 2009153665A JP 2011005819 A JP2011005819 A JP 2011005819A
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moving member
molding space
mold
runner
movable
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JP5059807B2 (en
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Koichi Kitano
綱一 北野
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OSAKA SEIMITU CO Ltd
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Abstract

PROBLEM TO BE SOLVED: To mold a molded article having favorable quality capable of integrally molding a plurality of kinds of materials by a simple structure.SOLUTION: There are provided a fixed side die 2a and a moving die 3a, and a moving member 8 changing a volume of a molding space arranged reciprocally relative to each die, and a coil spring 10 energizing the moving member 8 in a direction of reducing the volume of the molding space. The moving member 8 is pressed by an energizing member so as to form a first molding space 41a at the most advancing position and a second molding space 42a is formed upon moving to the most retracted position. A fused resin is introduced into the first molding space 41a from a first runner 5 and into the second molding space 42a from a second runner 6. A part of the moving member 8 has a flow control part 83 communicating with blocking the second runner 6 relative to the second molding space 42a. The flow control part 83 has a pressure receiving face 84 receiving the pressure of the fused resin. While the second runner 6 is blocked by the flow control part 83, the moving member 8 is retracted by the pressure of the resin against an energizing force of the coil spring 10 and the fused resin is introduced into the second molding space 42a after forming the space.

Description

本発明は、複数種類の樹脂材料部分から成る射出成形品の製造に好適な射出成形型に関する。   The present invention relates to an injection mold that is suitable for manufacturing an injection molded product composed of a plurality of types of resin material portions.

従来、例えば、2色成形品等の複数種類の樹脂材料から成る製品を射出成形法で成形する場合、特許文献1に開示されているような射出成形型が用いられている。   Conventionally, for example, when a product made of a plurality of types of resin materials such as a two-color molded product is molded by an injection molding method, an injection mold as disclosed in Patent Document 1 is used.

この射出成形型は、可動側金型と固定側金型を接合した状態で成形空間を形成し、さらに、この成形空間を2つに仕切る移動駒型をこの成形空間内に出し入れ可能に設けている。移動駒型を成形空間内に進出させて2つの成形空間を形成して一方の成形空間にのみ溶融樹脂を流し込むことにより1種類目の樹脂成形が行なわれる。次に、移動駒型を退出させて他方の成形空間に2種類目の溶融樹脂を流し込むことにより、可動側金型と固定側金型とを接合させたままの状態で2種類目の樹脂を1種類目の樹脂と一体化させた成形品ができ上がるようになっている。   In this injection mold, a molding space is formed in a state where the movable mold and the fixed mold are joined, and a moving piece mold that divides the molding space into two is provided so that it can be taken in and out of the molding space. Yes. The moving piece mold is advanced into the molding space to form two molding spaces, and the molten resin is poured into only one molding space to perform the first type of resin molding. Next, the movable piece mold is withdrawn and the second type of molten resin is poured into the other molding space. A molded product integrated with the first type of resin is completed.

ところで、この種の射出成形型では、前記移動駒型を往復摺動させる駆動手段として、油圧シリンダ等の機械駆動手段を用いている。従って、この機械駆動手段が射出成形型を大型化すると共に、構造を複雑化し、射出成形型の全体的なコストを大幅にアップさせる原因となっている。   By the way, in this type of injection mold, mechanical drive means such as a hydraulic cylinder is used as drive means for reciprocatingly sliding the moving piece mold. Therefore, this mechanical drive means increases the size of the injection mold, complicates the structure, and greatly increases the overall cost of the injection mold.

そこで、機械駆動手段を用いないで移動駒型を移動させるようにした射出成形型が提案されている(特許文献2)。この射出成形型は、成形空間の一部を形成する移動駒型を固定側金型に埋め込んだ状態にしており、この移動駒型を付勢部材により成形空間の容積を減少させる方向である可動側金型に向かう方向に付勢している。   Therefore, an injection mold in which the moving piece mold is moved without using a mechanical drive means has been proposed (Patent Document 2). In this injection mold, a movable piece mold that forms a part of the molding space is embedded in a fixed mold, and the movable piece mold is movable in a direction that reduces the volume of the molding space by a biasing member. It is energizing in the direction toward the side mold.

この移動駒型を進出移動させて可動側金型に接触させることにより第1成形空間を形成し、移動駒型を最後退位置まで移動させることにより第1成形空間に連続する第2成形空間が形成されるようになっている。そして、可動側金型及び固定側金型により第1成形空間に溶融樹脂を流入させる第1ランナを形成し、移動駒型における可動側金型との対向面に第2成形空間の一部となる凹部を形成すると共に、この凹部内に溶融樹脂を注入する第2ランナを固定側金型に形成している。   A first molding space is formed by moving the moving piece mold into contact with the movable mold, and a second molding space continuous to the first molding space is formed by moving the moving piece mold to the last retracted position. It is supposed to be formed. And the 1st runner which makes molten resin flow in into the 1st forming space by the movable side metallic mold and the fixed side metallic mold is formed, and a part of the 2nd molding space is formed on the surface facing the movable side metallic mold And a second runner for injecting molten resin into the recess is formed in the fixed mold.

付勢手段による押圧付勢により移動駒型を可動側金型に接触させることで、この移動駒型の外側に第1成形空間が形成され、前記凹部と可動側金型とにより溶融樹脂の圧力を受ける受圧室が形成される。そして、第1成形空間に第1ランナから1種類目の溶融樹脂を流入させて射出成形を行なう。   A first molding space is formed outside the movable piece mold by bringing the movable piece mold into contact with the movable mold by pressing biasing by the biasing means, and the pressure of the molten resin is formed by the recess and the movable mold. A pressure receiving chamber is formed. Then, injection molding is performed by flowing the first type of molten resin from the first runner into the first molding space.

次に移動駒型の凹部と可動側金型とにより形成される受圧室内に第2ランナから2種類目の溶融樹脂を注入する。凹部に溶融樹脂が注入され続けると、樹脂の圧力で移動駒型が付勢部材の付勢力に抗して第1成形空間と連通する最後退位置まで後退し、第1成形空間で成形された成形部分と第2成形空間で形成される成形部分とが一体化された樹脂成形物が得られる。   Next, a second type of molten resin is injected from the second runner into a pressure receiving chamber formed by the moving piece-shaped recess and the movable mold. When the molten resin continues to be injected into the recess, the moving piece mold moves back to the last retracted position communicating with the first molding space against the biasing force of the biasing member due to the pressure of the resin, and is molded in the first molding space. A resin molded product in which the molded part and the molded part formed in the second molding space are integrated is obtained.

特開2003−326564号公報JP 2003-326564 A 実開平4−109120号公報Japanese Utility Model Publication No. 4-109120

特許文献2の射出成形型では、移動駒型を移動させるための機械駆動手段は無くすことができるが、受圧室内に溶融樹脂を注入して、樹脂の圧力で移動駒型を後退移動させるようにしているため、所定の容積の第2成形空間が形成されるまでは、第2成形空間の容積が変動しながら樹脂が流入されていく。そのため、第2成形空間で形成された樹脂成形品に層状部分が発生したり、第1成形空間で成形された成形部分との間の接合強度が弱くなって境界部分で割れが生じたりする問題があった。   In the injection mold of Patent Document 2, the mechanical drive means for moving the movable piece mold can be eliminated, but molten resin is injected into the pressure receiving chamber, and the movable piece mold is moved backward by the pressure of the resin. Therefore, until the second molding space having a predetermined volume is formed, the resin flows in while the volume of the second molding space varies. For this reason, a layered portion is generated in the resin molded product formed in the second molding space, or a bond strength between the molded portion molded in the first molding space is weakened and a crack occurs at the boundary portion. was there.

本発明は、上記事情に鑑みてなされ、その目的は、簡単な構成で複数種類の材料を一体成形可能で、しかも、品質の良好な成形品を成形できる射出成形型を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an injection mold capable of integrally molding a plurality of types of materials with a simple configuration and capable of molding a molded product with good quality.

本発明に係る射出成形型は、接合状態で成形空間を形成する複数の金型と、前記金型に対して往復移動可能に設けられ、前記成形空間の容積を変化させる移動部材と、当該移動部材を前記成形空間の容積が減少する方向に押圧付勢する付勢部材とを備え、
前記成形空間は、前記移動部材が前記付勢部材に押圧されて最進出位置にある時に形成される第1成形空間と、前記移動部材が最進出位置から最後退位置まで移動して形成される第2成形空間とからなり、
第1成形空間に溶融樹脂を流入する第1ランナと、第2成形空間に溶融樹脂を流入する第2ランナとを有し、
前記移動部材は、その一部に第2ランナを第2成形空間に対して連通又は遮断可能とする流通規制部を有しており、当該流通規制部は第2ランナに注入された溶融樹脂の圧力を受ける受圧面を有し、前記流通規制部により第2ランナと第2成形空間との間を遮断しながら、前記受圧面が溶融樹脂の圧力を受けることにより前記付勢部材の付勢力に抗して前記移動部材を後退させて第2成形空間を形成し、第2成形空間が形成されると第2ランナと第2成形空間とが連通されて溶融樹脂が第2成形空間に流入する構成となっていることを特徴とする。
An injection mold according to the present invention includes a plurality of molds that form a molding space in a joined state, a movable member that is reciprocally movable with respect to the mold, and that changes the volume of the molding space, and the movement A biasing member that presses and biases the member in a direction in which the volume of the molding space decreases,
The molding space is formed by a first molding space formed when the moving member is pressed by the biasing member and located at the most advanced position, and the moving member is moved from the most advanced position to the last retracted position. A second molding space,
A first runner that flows molten resin into the first molding space; and a second runner that flows molten resin into the second molding space;
The moving member has a flow restricting portion that allows the second runner to communicate with or shut off the second runner at a part of the moving member, and the flow restricting portion includes the molten resin injected into the second runner. A pressure receiving surface that receives pressure, and the flow restricting portion blocks the space between the second runner and the second molding space, and the pressure receiving surface receives the pressure of the molten resin to thereby apply the biasing force of the biasing member. The moving member is moved backward to form a second molding space, and when the second molding space is formed, the second runner and the second molding space are communicated with each other, and the molten resin flows into the second molding space. It is the structure.

本発明によれば、前記移動部材の一部に第2ランナを第2成形空間に対して連通又は遮断可能とする流通規制部を形成し、この流通規制部の前記受圧面が第2ランナに注入された溶融樹脂の圧力を受けることにより、前記移動部材を付勢部材の付勢力に抗して後退させることができる。即ち、前記付勢部材による付勢力と、前記流通規制部の受圧面が受ける溶融樹脂の圧力とにより前記移動部材を進退移動させるので、油圧シリンダなどの機械駆動手段を用いることなく簡単な構成で前記移動部材を進退移動させることができる。   According to the present invention, a flow restricting portion that allows the second runner to communicate with or cut off from the second molding space is formed in a part of the moving member, and the pressure receiving surface of the flow restricting portion is formed on the second runner. By receiving the pressure of the injected molten resin, the moving member can be retracted against the urging force of the urging member. That is, since the moving member is moved forward and backward by the urging force of the urging member and the pressure of the molten resin received by the pressure receiving surface of the flow restricting portion, the structure can be simplified without using mechanical drive means such as a hydraulic cylinder. The moving member can be moved forward and backward.

さらに、前記移動部材の流通規制部により第2成形空間が形成されるまでは第2ランナと第2成形空間との間を遮断して第2成形空間に溶融樹脂を流入させず、所定の大きさの第2成形空間が形成された後に、第2ランナから第2成形空間に2種類目の溶融樹脂を流入させる。その結果、第1成形空間で成形した第1成形部分と第2成形空間で成形した第2成形部分との境界でせん断力が生じることはなく、層状の樹脂ムラも発生することがないので、異質材料間の接着強度が良好で品質の安定した成形品が得られる。   Furthermore, until the second molding space is formed by the flow restricting portion of the moving member, the second runner and the second molding space are blocked and the molten resin does not flow into the second molding space. After the second molding space is formed, the second type of molten resin is caused to flow from the second runner into the second molding space. As a result, no shear force is generated at the boundary between the first molded part molded in the first molding space and the second molded part molded in the second molding space, and no layered resin unevenness occurs. A molded product having good adhesive strength between different materials and stable quality can be obtained.

また、本発明の射出成形型は、前記金型が固定側金型と可動側金型を有し、前記移動部材が前記可動側金型の型開閉方向と直交する方向に移動可能に設けられており、第2ランナの一部が前記可動側金型と前記移動部材との間に形成され、前記流通規制部は、前記移動部材における可動側金型との対向面に形成される凸部により構成され、前記可動側金型に前記凸部が進退移動可能に収納される凹部を形成して、この凹部に前記凸部を収納することにより第2ランナの一部となる容積変動室を構成し、前記凸部が前記容積変動室に流入する溶融樹脂の圧力を受けることにより前記移動部材が最進出位置から最後退位置に移動するまでは前記凸部により第2ランナを第2成形空間に対して遮断する構成とすることが好ましい。   In the injection mold of the present invention, the mold includes a fixed mold and a movable mold, and the moving member is provided so as to be movable in a direction orthogonal to the mold opening / closing direction of the movable mold. A part of the second runner is formed between the movable mold and the moving member, and the flow restricting portion is a convex part formed on the surface of the moving member facing the movable mold. The volume change chamber which becomes a part of the 2nd runner by forming the crevice where the convex part is stored in the movable side metallic mold so that advance and retreat movement is possible, and the convex part is stored in this concave part. The second runner is configured by the convex portion until the moving member moves from the most advanced position to the last retracted position by receiving the pressure of the molten resin flowing into the volume fluctuation chamber. It is preferable to adopt a configuration that blocks the above.

このような構成により、前記移動部材に形成した前記凸部を流通規制部とし、前記可動側金型に前記凸部が進退移動可能に収納される凹部を形成して、この凹部に前記凸部を収納することにより第2ランナの一部となる容積変動室を構成して、この容積変動室に溶融樹脂を流入させることで移動部材を後退させて第2成形空間を形成することができる。しかも、前記凸部を最後退位置まで移動させるまでは、第2ランナを第2成形空間に対して遮断しておくことができる。その結果、一つの移動部材を用いるだけの簡単な構成で、所定の容積の第2成形空間が形成された後に、この第2成形空間に溶融樹脂を流入させて2種類の材料からなる成形品が得られる。   With such a configuration, the convex portion formed on the moving member is used as a flow restricting portion, and a concave portion is formed in the movable side mold so that the convex portion can be moved forward and backward, and the convex portion is formed in the concave portion. The volume change chamber which becomes a part of the second runner can be configured by storing and the molten resin can flow into the volume change chamber to retract the moving member to form the second molding space. In addition, the second runner can be blocked from the second molding space until the convex portion is moved to the last retracted position. As a result, with a simple configuration using only one moving member, after a second molding space having a predetermined volume is formed, a molded product made of two types of materials by flowing molten resin into the second molding space. Is obtained.

さらに、本発明の射出成形型は、前記金型が固定側金型と可動側金型とを有し、前記移動部材が前記可動側金型の型開閉方向と同方向に移動可能に設けられる第1移動部材及び第2移動部材と、型開閉方向と直交する方向に移動可能に設けられる第3移動部材とを備え、第1移動部材は、前記付勢部材により前記成形空間の容積が減少する方向に押圧付勢され、この付勢部材による付勢力に抗して移動することにより第2成形空間を形成し、第2移動部材は、往復移動により第2ランナを第2成形空間に対して連通又は遮断可能とする流通規制部となり、前記受圧面が型開閉方向と同方向に作用するように設けられており、第3移動部材は、第1移動部材とテーパー面同士で当接されると共に、第2移動部材ともテーパー面同士で当接しており、第2移動部材が樹脂圧を受けて移動することにより、各テーパー面同士の押圧により第1移動部材を付勢部材による付勢力に抗して移動させる構成とすることもできる。   Furthermore, in the injection mold of the present invention, the mold includes a fixed mold and a movable mold, and the moving member is provided to be movable in the same direction as the mold opening / closing direction of the movable mold. A first moving member and a second moving member; and a third moving member provided to be movable in a direction orthogonal to the mold opening and closing direction. The first moving member has a volume of the molding space reduced by the biasing member. The second forming space is formed by moving against the urging force of the urging member, and the second moving member moves the second runner against the second forming space by reciprocating movement. The pressure receiving surface is provided so as to act in the same direction as the mold opening / closing direction, and the third moving member is brought into contact with the first moving member and the tapered surfaces. And the second moving member is in contact with the tapered surfaces. , It is also possible that the second movable member by moving receiving resin pressure, a configuration for moving the first movable member by the pressing between the tapered surface against the biasing force of the biasing member.

このような構成により、各移動部材に形成したテーパー面同士の押圧により、第2移動部材が樹脂圧を受けて移動するのに伴って簡単に第3移動部材を介して第1移動部材を後退させ、第2成形空間が形成された後に、この第2成形空間に溶融樹脂を流入させて2種類の材料からなる成形品が得られる。   With such a configuration, the first moving member can be easily retracted via the third moving member as the second moving member receives the resin pressure and moves due to the pressure between the tapered surfaces formed on each moving member. Then, after the second molding space is formed, a molten resin is allowed to flow into the second molding space to obtain a molded product made of two kinds of materials.

本発明の射出成形型によれば、前記付勢部材による付勢力と、前記流通規制部の受圧面が受ける溶融樹脂の圧力とにより前記移動部材を進退移動させるので、油圧シリンダなどの機械駆動手段を用いることなく簡単な構成で前記移動部材を進退移動させることができる。
しかも、前記移動部材の流通規制部により第2成形空間が形成されるまでは第2ランナから第2成形空間に溶融樹脂を流入させないので、所定の大きさの第2成形空間が形成された後に、第2成形空間に2種類目の溶融樹脂を流入させることができる。その結果、第1成形空間で成形した第1成形部分と第2成形空間で成形した第2成形部分との境界でせん断力が生じることはなく、層状の樹脂ムラも発生することがないので、異質材料間の接着強度が良好で品質の安定した成形品の成形が可能となる。
According to the injection mold of the present invention, the moving member is moved forward and backward by the urging force of the urging member and the pressure of the molten resin received by the pressure receiving surface of the flow restricting portion. The moving member can be moved forwards and backwards with a simple configuration without using.
Moreover, since the molten resin is not allowed to flow from the second runner into the second molding space until the second molding space is formed by the flow restricting portion of the moving member, the second molding space having a predetermined size is formed. The second type of molten resin can be caused to flow into the second molding space. As a result, no shear force is generated at the boundary between the first molded part molded in the first molding space and the second molded part molded in the second molding space, and no layered resin unevenness occurs. It is possible to mold a molded product having a good quality and a stable quality between different materials.

本発明の実施形態1に係る射出成形型であって、可動側金型の部分平面図である。It is an injection mold which concerns on Embodiment 1 of this invention, Comprising: It is a fragmentary top view of a movable mold. 本発明の実施形態1に係る射出成形型の第2移動部材が最進出位置にある状態を示す部分断面図である。It is a fragmentary sectional view showing the state where the 2nd moving member of the injection mold concerning Embodiment 1 of the present invention exists in the most advanced position. 本発明の実施形態1に係る射出成形型の第2移動部材が最後退位置にある状態を示す部分断面図である。It is a fragmentary sectional view showing the state where the 2nd moving member of the injection mold concerning Embodiment 1 of the present invention exists in the last retreat position. 本発明の実施形態1に係る射出成形型の第2ランナに溶融樹脂が注入される前の容積変動室の状態を示す説明図である。It is explanatory drawing which shows the state of the volume fluctuation | variation chamber before molten resin is inject | poured into the 2nd runner of the injection mold which concerns on Embodiment 1 of this invention. 本発明の実施形態1に係る射出成形型の第2ランナに溶融樹脂が注入されて、流通規制部が樹脂圧により後退し始めたときの容積変動室の状態を示す説明図である。It is explanatory drawing which shows the state of a volume fluctuation | variation chamber when molten resin is inject | poured into the 2nd runner of the injection mold which concerns on Embodiment 1 of this invention, and a distribution control part begins to reverse | retreat with resin pressure. 本発明の実施形態1に係る射出成形型の溶融樹脂の圧力により流通規制部が最後退位置まで移動したときの容積変動室の状態を示す説明図である。It is explanatory drawing which shows the state of a volume fluctuation | variation chamber when a distribution control part moves to the last retracted position with the pressure of the molten resin of the injection mold which concerns on Embodiment 1 of this invention. 本発明の実施形態2に係る射出成形型の第2ランナに溶融樹脂が注入される前の状態を示す部分断面図である。It is a fragmentary sectional view which shows the state before molten resin is inject | poured into the 2nd runner of the injection mold which concerns on Embodiment 2 of this invention. 本発明の実施形態2に係る射出成形型の第2ランナに溶融樹脂が注入されて第2移動部材が樹脂圧により移動し始めた状態を示す部分断面図である。It is a fragmentary sectional view showing the state where molten resin was poured into the 2nd runner of the injection mold concerning Embodiment 2 of the present invention, and the 2nd moving member began to move with resin pressure. 本発明の実施形態2に係る射出成形型の溶融樹脂の圧力により第2移動部材が最後退位置まで移動した状態を示す部分断面図である。It is a fragmentary sectional view which shows the state which the 2nd moving member moved to the last retracted position with the pressure of the molten resin of the injection mold which concerns on Embodiment 2 of this invention.

(実施形態1)
以下に、本発明の実施形態1について添付図面を参照しながら説明する。
図1は、本発明の実施形態1に係る射出成形型における可動側金型の部分平面図を示している。図2は、本実施形態1に係る射出成形型の部分断面図であって、第2移動部材が最進出位置にある状態を示している。図3は、本実施形態1に係る射出成形型の部分断面図であって、第2移動部材が最後退位置にある状態を示している。
(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a partial plan view of a movable mold in an injection mold according to Embodiment 1 of the present invention. FIG. 2 is a partial cross-sectional view of the injection mold according to the first embodiment, and shows a state where the second moving member is at the most advanced position. FIG. 3 is a partial cross-sectional view of the injection mold according to the first embodiment, showing a state where the second moving member is in the last retracted position.

本実施形態1に係る射出成形型1aは、図2及び図3に示すように、雌型を有する固定側金型2aと雄型を有する可動側金型3aを備えており、上側の固定側金型2aに対して下側の可動側金型3aを上下方向に移動させることにより、固定側金型2aに対して可動側金型3aを開閉するようになっている。固定側金型2aと可動側金型3aとを閉じることにより、内部に溶融樹脂が流入される成形空間が形成される。   As shown in FIGS. 2 and 3, the injection mold 1a according to the first embodiment includes a fixed mold 2a having a female mold and a movable mold 3a having a male mold, and an upper fixed side. The movable mold 3a is opened and closed with respect to the fixed mold 2a by moving the movable mold 3a below the mold 2a in the vertical direction. By closing the fixed mold 2a and the movable mold 3a, a molding space into which the molten resin flows is formed.

本実施形態1では、成形空間は、図2に示すように、固定側金型2aと可動側金型3aと後述する移動部材8とで囲まれて形成される第1成形空間41aと、図3に示すように、移動部材8と可動側金型3aと第1成形空間41aで形成された第1成形部分11の端面とで囲まれて形成される第2成形空間42aとから成る。   In the first embodiment, as shown in FIG. 2, the molding space includes a first molding space 41a formed by being surrounded by a fixed mold 2a, a movable mold 3a, and a moving member 8 described later, As shown in FIG. 3, the movable member 8, the movable mold 3 a, and the second molding space 42 a formed by being surrounded by the end surface of the first molding portion 11 formed by the first molding space 41 a are included.

そして、第1成形空間41aに溶融樹脂を流入させる第1ランナ5が固定側金型2aと可動側金型3aとの間に形成される。なお、図1には固定側金型2aを取り除いた状態の第1ランナ5が示されている。また、第2成形空間42aに溶融樹脂を流入させる第2ランナ6が移動部材8と可動側金型3aとの間、及び、固定側金型2aと可動側金型3aとの間に形成される。図1には、固定側金型2aを取り除いた状態の第2ランナ6が示されている。第1ランナ5及び第2ランナ6は、溶融樹脂の供給通路となる。なお、図1に示すように、第1ランナ5は第1ゲート50を介して第1成形空間41aに連通しており、第2ランナ6も第2ゲート60を介して第2成形空間42aに連通している。   And the 1st runner 5 which makes molten resin flow in into the 1st shaping | molding space 41a is formed between the stationary mold 2a and the movable mold 3a. FIG. 1 shows the first runner 5 with the fixed mold 2a removed. Further, the second runner 6 for allowing the molten resin to flow into the second molding space 42a is formed between the moving member 8 and the movable side mold 3a, and between the fixed side mold 2a and the movable side mold 3a. The FIG. 1 shows the second runner 6 with the fixed mold 2a removed. The first runner 5 and the second runner 6 serve as a molten resin supply passage. As shown in FIG. 1, the first runner 5 communicates with the first molding space 41 a via the first gate 50, and the second runner 6 also enters the second molding space 42 a via the second gate 60. Communicate.

さらに、可動側金型3aには、可動側金型3aの上下移動に伴いながら可動側金型3aの水平面を水平方向に摺動するスライドコア7と移動部材8とが設けられている。本実施形態1では、第2成形空間42aで形成される製品部分がアンダーカット部となるため、可動側金型3aを開いて成形品の型抜きを行なう際に支障が生じないようにするために移動部材8もスライドコアの一部となる。   Further, the movable mold 3a is provided with a slide core 7 and a moving member 8 that slide in the horizontal direction on the horizontal surface of the movable mold 3a as the movable mold 3a moves up and down. In the first embodiment, since the product portion formed in the second molding space 42a is an undercut portion, there is no problem when the movable mold 3a is opened and the molded product is punched. Further, the moving member 8 is also a part of the slide core.

スライドコア7は、固定側金型2aに取り付けられる斜めガイドピン(図示せず)に案内されて、可動側金型3aが型開方向に移動した際に、可動側金型3aの水平面に接触しながら水平方向に摺動するようなっている。   The slide core 7 is guided by an oblique guide pin (not shown) attached to the fixed mold 2a, and contacts the horizontal surface of the movable mold 3a when the movable mold 3a moves in the mold opening direction. While sliding in the horizontal direction.

スライドコア7は、図1及び図2に示すように、3つの側面を有し、移動部材8の一部を受け入れる段部71が形成されており、この段部71の対向する1対の壁面が移動部材8を可動側金型3aの雄型部分に対して進退移動させる際のガイド面となる。さらに、この段部71の前記雄型部分に対向する壁面に、コイルバネ10の一端部を収納するバネ収納部72が3つ設けられている。   As shown in FIGS. 1 and 2, the slide core 7 has three side surfaces, and is formed with a step portion 71 that receives a part of the moving member 8, and a pair of opposing wall surfaces of the step portion 71. Becomes a guide surface for moving the moving member 8 forward and backward relative to the male part of the movable mold 3a. Further, three spring accommodating portions 72 for accommodating one end portions of the coil springs 10 are provided on the wall surface of the step portion 71 facing the male portion.

移動部材8は、図2に示すように可動側金型3aの雄型表面形状に沿って当接し、図3に示すように可動側金型3aから離れた位置で第2成形空間42aを形成する曲面81を有するブロック状に形成されている。移動部材8にも、スライドコア7のバネ収納部72に対向する側面にコイルバネ10の他端部を収納するバネ収納部82が形成されている。このコイルバネ10が、移動部材8を前記雄型部分に向かって第2成形空間42aの容積が減少する方向に押圧付勢する付勢部材となる。   The moving member 8 abuts along the male mold surface shape of the movable mold 3a as shown in FIG. 2, and forms a second molding space 42a at a position away from the movable mold 3a as shown in FIG. It is formed in a block shape having a curved surface 81. The moving member 8 is also formed with a spring accommodating portion 82 that accommodates the other end of the coil spring 10 on the side surface of the slide core 7 that faces the spring accommodating portion 72. The coil spring 10 serves as a biasing member that presses and biases the moving member 8 toward the male part in a direction in which the volume of the second molding space 42a decreases.

移動部材8は、可動側金型3aが開いた際に、成形品をスムーズに型抜きできるようにするためスライドコア7と共に水平方向にスライドする構成となっている。そのため、移動部材8は、スライドコア7に対して所定の範囲内で摺動可能で、しかも、可動側金型3aが固定側金型2aから離れたときにスライドコア7から脱落しないように、スライドコア7に水平方向へ移動可能に取り付けられている。具体的には、移動部材8は、固定側金型2aと可動側金型3aとを閉じた状態で、可動側金型3aの雄型表面に当接する位置から、第2成形空間42aを形成する最後退位置まで移動可能にスライドコア7に取り付けられている。   The movable member 8 is configured to slide in the horizontal direction together with the slide core 7 so that the molded product can be smoothly punched when the movable mold 3a is opened. Therefore, the moving member 8 is slidable within a predetermined range with respect to the slide core 7, and the movable member 3a does not fall off the slide core 7 when the movable die 3a is separated from the fixed die 2a. The slide core 7 is attached to be movable in the horizontal direction. Specifically, the moving member 8 forms the second molding space 42a from a position where it contacts the male surface of the movable mold 3a with the fixed mold 2a and the movable mold 3a closed. It is attached to the slide core 7 so as to be movable to the last retracted position.

また、移動部材8における可動側金型3aの水平面と対向する面には、直方体状の凸部が形成されており、この凸部が第2ランナ6を第2成形空間42aに対して連通又は遮断可能とする流通規制部83となる。   Further, a rectangular parallelepiped convex portion is formed on the surface of the moving member 8 facing the horizontal surface of the movable mold 3a, and this convex portion communicates the second runner 6 with the second molding space 42a. It becomes the distribution | distribution control part 83 which can be interrupted | blocked.

第2ランナ6は、固定側金型2aと可動側金型3aとの間で形成される入口側通路61と、移動部材8と可動側金型3aとの間に形成される上流側通路62、容積変動室63及び下流側通路64から構成される。上流側通路62は一端が入口側通路61に連続し、他端が容積変動室63内に連通している。下流側通路64は一端が容積変動室63内に連通し、他端が第2ゲート60を介して第2成形空間42aに連通している。容積変動室63は、可動側金型3aにコの字状の段部31(本発明の凹部)を形成し、この段部31に、移動部材8に形成される流通規制部83を嵌め込んで形成される。   The second runner 6 includes an inlet-side passage 61 formed between the fixed-side mold 2a and the movable-side mold 3a, and an upstream-side passage 62 formed between the moving member 8 and the movable-side mold 3a. The volume variation chamber 63 and the downstream passage 64 are configured. One end of the upstream side passage 62 is continuous with the inlet side passage 61, and the other end communicates with the volume variation chamber 63. One end of the downstream passage 64 communicates with the volume variation chamber 63, and the other end communicates with the second molding space 42 a via the second gate 60. The volume variation chamber 63 is formed with a U-shaped step portion 31 (recessed portion of the present invention) in the movable mold 3 a, and a flow regulating portion 83 formed on the moving member 8 is fitted into the step portion 31. Formed with.

次に、容積変動室63について図4から図6に基づいて具体的に説明する。なお、図4は第2ランナ6に溶融樹脂が注入される前の容積変動室63の状態、図5は第2ランナ6に溶融樹脂が注入されて容積変動室63の容積が増大し始めた状態、図6は第2ランナ6に溶融樹脂が注入されて容積変動室63の容積が最大になり、第2成形空間42aに溶融樹脂が流入した状態を示す。   Next, the volume fluctuation chamber 63 will be specifically described with reference to FIGS. 4 shows the state of the volume fluctuation chamber 63 before the molten resin is injected into the second runner 6, and FIG. 5 shows that the volume of the volume fluctuation chamber 63 starts to increase after the molten resin is injected into the second runner 6. FIG. 6 shows a state in which the molten resin is injected into the second runner 6 to maximize the volume of the volume fluctuation chamber 63 and the molten resin flows into the second molding space 42a.

容積変動室63は、図1及び図6に示すように、段部31の奥側の第1壁面32が第2成形空間42aの近くに形成され、移動部材8の摺動方向と直交する方向に延びるように形成されている。そして、上流側通路62は、第1壁面32の上部から容積変動室63に連通するように形成されている。また、下流側通路64は、段部31の第1壁面32に隣接し、入口側通路61と反対側に形成される第2壁面33の上部から最大容積となった容積変動室63に連通するように形成されている。さらに、下流側通路64は、容積変動室63へ開口する部分の通路断面積が最も小さくなるように容積変動室63への連通部が先細り状に形成されている。   As shown in FIGS. 1 and 6, the volume variation chamber 63 is formed in a direction in which the first wall surface 32 on the back side of the step portion 31 is formed near the second molding space 42 a and is orthogonal to the sliding direction of the moving member 8. It is formed to extend. The upstream passage 62 is formed to communicate with the volume variation chamber 63 from the upper part of the first wall surface 32. Further, the downstream side passage 64 is adjacent to the first wall surface 32 of the step portion 31 and communicates with the volume changing chamber 63 having the maximum volume from the upper part of the second wall surface 33 formed on the opposite side to the inlet side passage 61. It is formed as follows. Furthermore, the downstream side passage 64 is formed with a tapered communication portion to the volume variation chamber 63 so that the passage sectional area of the portion opening to the volume variation chamber 63 is the smallest.

本実施形態1では、移動部材8における流通規制部83の第1壁面32と対向する壁面は受圧面84となり、段部31と受圧面84と移動部材8の下面とで囲まれて容積変動室63が形成される。図4に示した第2ランナ6に溶融樹脂が注入されていない状態から、図5に示すように、第2ランナ6に溶融樹脂が注入されて上流側通路62から容積変動室63内に溶融樹脂が流入すると、樹脂の圧力を受圧面84が受ける。そして、図6に示すように、この樹脂圧で移動部材8がコイルバネ10の付勢力に抗して可動側金型3aの雄型部分から離れる方向に最後退位置まで移動する。   In the first embodiment, the wall surface of the moving member 8 that faces the first wall surface 32 of the flow restricting portion 83 becomes the pressure receiving surface 84, and is surrounded by the step portion 31, the pressure receiving surface 84, and the lower surface of the moving member 8. 63 is formed. From the state in which the molten resin is not injected into the second runner 6 shown in FIG. 4, the molten resin is injected into the second runner 6 and melted into the volume fluctuation chamber 63 from the upstream side passage 62 as shown in FIG. When the resin flows in, the pressure receiving surface 84 receives the pressure of the resin. As shown in FIG. 6, the resin member moves the moving member 8 against the urging force of the coil spring 10 in the direction away from the male part of the movable mold 3a to the last retracted position.

本実施形態1では、段部31における水平方向に開放する部分はスライドコア7の側面で閉鎖するようになっており、段部31は、その開放部分をスライドコア7で閉鎖した状態で流通規制部83が最進出位置から最後退位置まで進退移動できる大きさに形成されている。移動部材8は、樹脂圧で後退する場合、流通規制部83における受圧面84とは反対側の面がスライドコア7の側面に当接して移動が規制されるのであって、移動部材8の曲面81が可動側金型3aの雄型部分に接触する位置が最進出位置となり、流通規制部83がスライドコア7に接触する位置が最後退位置となる。   In the first embodiment, the portion of the step portion 31 that opens in the horizontal direction is closed on the side surface of the slide core 7, and the step portion 31 is in a state where the opening portion is closed with the slide core 7 and the flow regulation is performed. The portion 83 is formed in a size that can move forward and backward from the most advanced position to the last retracted position. When the moving member 8 is retracted by the resin pressure, the surface of the flow restricting portion 83 opposite to the pressure receiving surface 84 is in contact with the side surface of the slide core 7 so that the movement is restricted. The position where 81 contacts the male part of the movable mold 3a is the most advanced position, and the position where the flow restricting portion 83 contacts the slide core 7 is the last retracted position.

なお、コイルバネ10の強さは、第2ランナ6に溶融樹脂が注入されていない状態で移動部材8を最進出位置に向けて円滑に摺動させることができ、かつ、容積変動室63内に溶融樹脂が流入して移動部材8の受圧面84が樹脂の圧力を受けたときには、移動部材8がコイルバネ10の押圧付勢力に抗して最後退位置まで摺動できる強さに設定している。このように、コイルバネ10の付勢力を適正に設定するだけで、移動部材8を所定範囲に亘り円滑に往復摺動させることができる。尚、コイルバネ10は、本実施形態1では、3つ設けたが、コイルバネ10の強さに応じて、一つだけ設けることもできるし、2つでもよい。   The strength of the coil spring 10 is such that the moving member 8 can be smoothly slid toward the most advanced position in the state where the molten resin is not injected into the second runner 6, and the volume spring chamber 63 has When the molten resin flows in and the pressure receiving surface 84 of the moving member 8 receives the pressure of the resin, the moving member 8 is set to a strength capable of sliding to the last retracted position against the pressing biasing force of the coil spring 10. . Thus, the moving member 8 can be smoothly reciprocated over a predetermined range only by appropriately setting the urging force of the coil spring 10. Although three coil springs 10 are provided in the first embodiment, only one or two coil springs may be provided according to the strength of the coil spring 10.

次に、本実施形態1に係る射出成形型1aを用いて2種類の樹脂から成る成形品を成形する工程について説明する。まず、図4に示すように、第2ランナ6に溶融樹脂が注入されていない状態では、移動部材8がコイルバネ10に押圧されて最進出位置になっている。   Next, a process of molding a molded product made of two kinds of resins using the injection mold 1a according to the first embodiment will be described. First, as shown in FIG. 4, when the molten resin is not injected into the second runner 6, the moving member 8 is pressed by the coil spring 10 and is in the most advanced position.

この時、移動部材8の曲面81が可動側金型3aの雄型表面に当接するので第2成形空間42aは形成されず、第1成形空間41aのみが形成される。この状態で、第1ランナ5から1種類目の溶融樹脂を注入すると、図2に示すように第1成形空間41a内において1種類目の樹脂の射出成形が行なわれ第1成形部分11が成形される。なお、図2及び図4に示すように、移動部材8が最進出位置にあるときは、流通規制部83が下流側通路64を塞いだ状態になっており、第2ランナ6の上流側通路62と下流側通路64とが流通規制部83により連通が遮断された状態になっている。   At this time, since the curved surface 81 of the moving member 8 contacts the male surface of the movable mold 3a, the second molding space 42a is not formed, and only the first molding space 41a is formed. When the first type of molten resin is injected from the first runner 5 in this state, the first type of resin is injection-molded in the first molding space 41a as shown in FIG. Is done. As shown in FIGS. 2 and 4, when the moving member 8 is at the most advanced position, the flow restricting portion 83 is in a state of blocking the downstream side passage 64, and the upstream side passage of the second runner 6. The communication between the flow passage 62 and the downstream passage 64 is blocked by the flow restricting portion 83.

そして、図5に示すように、第2ランナ6に溶融樹脂が注入されると、入口側通路61及び上流側通路62から容積変動室63内に溶融樹脂が流入して流通規制部83の受圧面84が樹脂の圧力を受け、移動部材8がコイルバネ10の押圧付勢力に抗して後退し始める。このとき、下流側通路64は、流通規制部83がほぼ最後退位置となるまで、この流通規制部83で封鎖された状態になっており、下流側通路64が流通規制部83によって封鎖されている間は、第2成形空間42aは、移動部材8の後退により徐々に容積が増大していくが溶融樹脂は第2成形空間42aには流入しない。   Then, as shown in FIG. 5, when molten resin is injected into the second runner 6, the molten resin flows into the volume fluctuation chamber 63 from the inlet side passage 61 and the upstream side passage 62, and the pressure of the flow restricting portion 83 is received. The surface 84 receives the pressure of the resin, and the moving member 8 starts to retract against the pressing biasing force of the coil spring 10. At this time, the downstream passage 64 is in a state of being blocked by the distribution restricting portion 83 until the distribution restricting portion 83 is almost at the most retracted position, and the downstream passage 64 is blocked by the distribution restricting portion 83. During this time, the volume of the second molding space 42a gradually increases as the moving member 8 moves backward, but the molten resin does not flow into the second molding space 42a.

さらに、流通規制部83の受圧面84が樹脂の圧力を受け、移動部材8が最後退位置まで後退すると、第2成形空間42aも最大容積となり、下流側通路64が容積変動室63と連通して、溶融樹脂が下流側通路64そして第2ゲート60を介して第2成形空間42aに流入し、第2成形空間42aによる射出成形が行なわれ、第2成形部分12が成形される。なお、下流側通路64は、移動部材8の最後退位置の手前で容積変動室63と連通するが、下流側通路64の容積変動室63への連通部が先細り状に形成され、下流側通路64の長さは移動部材8が最後退位置に至った時点で溶融樹脂が第2ゲート60に到達しない長さとしているので、移動部材8が最後退位置に至った後に、第2成形空間42aに溶融樹脂を流入させることができる。   Further, when the pressure receiving surface 84 of the flow restricting portion 83 receives the pressure of the resin and the moving member 8 is retracted to the last retracted position, the second molding space 42a also has the maximum volume, and the downstream passage 64 communicates with the volume variation chamber 63. Thus, the molten resin flows into the second molding space 42a through the downstream passage 64 and the second gate 60, and injection molding is performed in the second molding space 42a, whereby the second molding portion 12 is molded. Although the downstream side passage 64 communicates with the volume variation chamber 63 before the last retracted position of the moving member 8, the communication portion of the downstream side passage 64 to the volume variation chamber 63 is formed in a tapered shape, and the downstream side passage is formed. Since the length of 64 is such that the molten resin does not reach the second gate 60 when the moving member 8 reaches the last retracted position, the second molding space 42a is reached after the moving member 8 reaches the last retracted position. Molten resin can be allowed to flow into.

本実施形態1では、図3及び図6に示すように、移動部材8が最後退位置まで移動したときに、既に成形されている第1成形部分11の端面と可動側金型3aと移動部材8の曲面81とで囲まれた空間により第2成形空間42aが形成され、第2成形空間42aに流入した溶融樹脂は第1成形部分11と一体化し、第2成形部分12が成形される。   In the first embodiment, as shown in FIGS. 3 and 6, when the moving member 8 moves to the last retracted position, the end surface of the first molded part 11 that has already been formed, the movable mold 3 a, and the moving member. The second molding space 42a is formed by the space surrounded by the curved surface 81, and the molten resin flowing into the second molding space 42a is integrated with the first molding portion 11 and the second molding portion 12 is molded.

以上のように、本実施形態1に係る射出成形型1aは、第2ランナ6に溶融樹脂が注入されると流通規制部83が溶融樹脂の圧力を受けることによりコイルバネ10の付勢力に抗して移動部材8が最進出位置から後退していくようになっている。   As described above, the injection mold 1a according to the first embodiment resists the urging force of the coil spring 10 by the flow regulating portion 83 receiving the pressure of the molten resin when the molten resin is injected into the second runner 6. Thus, the moving member 8 is retracted from the most advanced position.

すなわち、第1ランナ5から1種類目の溶融樹脂を第1成形空間41aに流入させるときには移動部材8が最進出位置にあり、第2成形空間42aは形成されずに第1成形空間41aのみでの成形が行なわれる。   That is, when the first type molten resin flows from the first runner 5 into the first molding space 41a, the moving member 8 is at the most advanced position, and the second molding space 42a is not formed but only in the first molding space 41a. Is formed.

そして、図5に示すように、上流側通路62から2種類目の溶融樹脂が容積変動室63内に流入していくと、流通規制部83の受圧面84が溶融樹脂の圧力を受けて移動部材8が最進出位置から後退していき、図6に示すように、移動部材8が最後退位置に到達する直前に、流通規制部83により塞がれていた下流側通路64が容積変動室63内と連通して、下流側通路64から最大容積となった第2成形空間42aに溶融樹脂が流入して射出成形が行なわれる。   Then, as shown in FIG. 5, when the second type of molten resin flows into the volume fluctuation chamber 63 from the upstream passage 62, the pressure receiving surface 84 of the flow regulating portion 83 receives the pressure of the molten resin and moves. As shown in FIG. 6, the downstream passage 64 that has been blocked by the flow restricting portion 83 immediately before the moving member 8 reaches the last retracted position is formed in the volume fluctuation chamber. The molten resin flows into the second molding space 42a having the maximum volume from the downstream passage 64 in communication with the inside of the downstream side passage 64, and injection molding is performed.

本実施形態1の射出成形型1aによれば、コイルバネ10により進出させておいた移動部材8を第2成形空間42aに流入させる溶融樹脂を容積変動室63に流し込むようにして後退させる簡単な構成で、移動部材8を進退移動させることができる。その結果、移動部材8を駆動させるために油圧シリンダのような機械駆動手段を設ける場合に比べて、極めて簡単に射出成形型を構成することができる。   According to the injection mold 1a of the first embodiment, a simple configuration is adopted in which the molten resin that has been advanced by the coil spring 10 is retreated by flowing the molten resin flowing into the second molding space 42a into the volume fluctuation chamber 63. Thus, the moving member 8 can be moved back and forth. As a result, the injection mold can be configured very easily as compared with the case where mechanical drive means such as a hydraulic cylinder is provided to drive the moving member 8.

しかも、樹脂圧を利用して移動部材8を後退させる際に、第2成形空間42aが最大容積になるまでは、第2成形空間42aに溶融樹脂が流入しないので、最初に成形した第1成形部分11と後から成形した第2成形部分12との境界で生じるせん断によって割れが生じたり、層状の樹脂ムラが発生したりすることを阻止することができ、異質材料間の接着強度を向上でき、品質の安定した2種同時成形が可能となる。   In addition, when the moving member 8 is moved backward using the resin pressure, the molten resin does not flow into the second molding space 42a until the second molding space 42a reaches the maximum volume. It is possible to prevent the occurrence of cracks or the occurrence of layered resin unevenness due to the shear generated at the boundary between the portion 11 and the second molded portion 12 formed later, and improve the adhesive strength between different materials. , Two types of simultaneous molding with stable quality are possible.

(実施形態2)
前記実施形態1の射出成形型1aは、可動側金型3aに型開閉方向と直交する方向に進退移動するようにスライドコア7及び移動部材8を取り付けて第1成形空間41aと第2成形空間42aを形成するようにした。本実施形態2の射出成形型1bは、固定側金型2bに対して型開閉方向に進退移動する第1移動部材8a及び第2移動部材8bと、型開閉方向と直交する方向に進退移動する第3移動部材8cを取り付けて第1成形空間41bと第2成形空間42bを形成するようにしている。
(Embodiment 2)
In the injection mold 1a of the first embodiment, the first molding space 41a and the second molding space are obtained by attaching the slide core 7 and the moving member 8 to the movable mold 3a so as to advance and retreat in a direction orthogonal to the mold opening / closing direction. 42a was formed. The injection mold 1b according to the second embodiment moves forward and backward in a direction perpendicular to the mold opening and closing direction, and the first moving member 8a and the second moving member 8b that move forward and backward in the mold opening and closing direction with respect to the fixed mold 2b. The third moving member 8c is attached to form the first molding space 41b and the second molding space 42b.

以下に、本発明の実施形態2について添付図面を参照しながら説明する。
図7は、実施形態2に係る射出成形型1bの部分断面図であって、第1移動部材8aが最進出位置にある状態を示している。図8は、実施形態2に係る射出成形型1bの部分断面図であって、第1移動部材8aが後退している途中の状態を示している。図9は、本実施形態2に係る射出成形型1bの部分断面図であって、第1移動部材8aが最後退位置にある状態を示している。
Hereinafter, Embodiment 2 of the present invention will be described with reference to the accompanying drawings.
FIG. 7 is a partial cross-sectional view of the injection mold 1b according to the second embodiment, and shows a state where the first moving member 8a is at the most advanced position. FIG. 8 is a partial cross-sectional view of the injection mold 1b according to the second embodiment and shows a state in which the first moving member 8a is being retracted. FIG. 9 is a partial cross-sectional view of the injection mold 1b according to the second embodiment, and shows a state where the first moving member 8a is in the last retracted position.

本実施形態2に係る射出成形型1bは、図7から図9に示すように、固定側金型2bと可動側金型3bとを備えており、上側の固定側金型2bに対して下側の可動側金型3bを上下方向に移動させることにより、固定側金型2bに対して可動側金型3bを開閉するようになっている。固定側金型2bと可動側金型3bとを閉じることにより、内部に溶融樹脂が流入される成形空間が形成される。   The injection mold 1b according to the second embodiment includes a fixed mold 2b and a movable mold 3b as shown in FIGS. 7 to 9, and is lower than the upper fixed mold 2b. The movable mold 3b is opened and closed with respect to the fixed mold 2b by moving the movable mold 3b on the side in the vertical direction. By closing the fixed mold 2b and the movable mold 3b, a molding space into which the molten resin flows is formed.

本実施形態2では、成形空間は、図7に示すように、固定側金型2bと可動側金型3bと後述する第1移動部材8aの側面とで囲まれて形成される第1成形空間41bと、図8及び図9に示すように、固定側金型2bと可動側金型3bと第1移動部材8aの下面と第1成形空間41bで形成された第1成形部分11の端面とで囲まれて形成される第2成形空間42bとから成る。本実施形態2では、第1移動部材8aを進出させて固定側金型2bと可動側金型3bとで形成される成形空間を2分割し、一方の成形空間を第1成形空間41bとしている。   In the second embodiment, as shown in FIG. 7, the molding space is a first molding space formed by being surrounded by a fixed mold 2b, a movable mold 3b, and a side surface of a first moving member 8a described later. 41b, as shown in FIGS. 8 and 9, the fixed mold 2b, the movable mold 3b, the lower surface of the first moving member 8a, and the end surface of the first molding portion 11 formed by the first molding space 41b, And a second molding space 42b formed by being surrounded by. In the second embodiment, the first moving member 8a is advanced to divide the molding space formed by the fixed mold 2b and the movable mold 3b into two, and one molding space is defined as the first molding space 41b. .

そして、第1成形空間41bに溶融樹脂を流入させる第1ランナ5が固定側金型2bと可動側金型3bとの間に形成される。また、第2成形空間42bに溶融樹脂を流入させる第2ランナ6が、固定側金型2bと可動側金型3bとの間と、第2移動部材8bと可動側金型3bとの間に形成される。なお、本実施形態2も、第1ランナ5は第1ゲート50を介して第1成形空間41bに連通しており、第2ランナ6も第2ゲート60を介して第2成形空間42bに連通している。   And the 1st runner 5 which makes molten resin flow in into the 1st shaping | molding space 41b is formed between the stationary mold 2b and the movable mold 3b. Further, the second runner 6 for allowing the molten resin to flow into the second molding space 42b is provided between the fixed mold 2b and the movable mold 3b, and between the second moving member 8b and the movable mold 3b. It is formed. In the second embodiment, the first runner 5 communicates with the first molding space 41b via the first gate 50, and the second runner 6 communicates with the second molding space 42b via the second gate 60. is doing.

本実施形態2では、固定側金型2bに、可動側金型3bの開閉方向と同方向に移動し、第2成形空間42bの一部を形成する第1移動部材8aと、可動側金型3bの開閉方向と同方向に移動し、第2ランナ6を第2成形空間42bに対して連通遮断する第2移動部材8bと、第1移動部材8aと第2移動部材8bの動きに連動して可動側金型3bの開閉方向と直交する方向に移動する第3移動部材8cとが組みつけられている。   In the second embodiment, a first moving member 8a that moves in the same direction as the opening and closing direction of the movable mold 3b to the fixed mold 2b and forms a part of the second molding space 42b, and the movable mold The second moving member 8b moves in the same direction as the opening / closing direction of 3b and blocks the second runner 6 from communicating with the second molding space 42b, and interlocks with the movement of the first moving member 8a and the second moving member 8b. A third moving member 8c that moves in a direction orthogonal to the opening / closing direction of the movable mold 3b is assembled.

第1移動部材8aは、縦長の直方体状のブロックからなり、固定側金型2bに形成する第1装着穴21に型開閉方向に進退移動可能で、長手方向が進退方向となるように装着される。この第1移動部材8aは、長手方向における可動側金型3bとは反対側の端面に凹部85が形成され、この凹部85にコイルバネ10が装着されている。このコイルバネ10は、固定側金型2bの一部となる板部材22によって一端が受け止められており、第1移動部材8aを可動側金型3bに向かって押圧付勢する。このコイルバネ10が、第1移動部材8aを可動側金型3bに向かって第2成形空間42bの容積が減少する方向に押圧付勢する付勢部材となる。   The first moving member 8a is composed of a vertically long rectangular parallelepiped block, and is mounted in the first mounting hole 21 formed in the fixed mold 2b so that the first moving member 8a can move forward and backward in the mold opening / closing direction, and the longitudinal direction is the forward / backward direction. The In the first moving member 8a, a concave portion 85 is formed on the end surface opposite to the movable mold 3b in the longitudinal direction, and the coil spring 10 is attached to the concave portion 85. One end of the coil spring 10 is received by a plate member 22 that is a part of the fixed mold 2b, and presses and biases the first moving member 8a toward the movable mold 3b. The coil spring 10 serves as a biasing member that presses and biases the first moving member 8a toward the movable mold 3b in a direction in which the volume of the second molding space 42b decreases.

さらに、第1移動部材8aは、長手方向の途中に開口形状が矩形の貫通穴86が形成されている。この貫通穴86は、可動側金型3b側に配置される内面が金型開閉方向と直交する方向に延びる平面で形成され、この内面と対向する内面(第1テーパー面87)がテーパーに形成されている。この貫通穴86における開口面積が大きい側から第3移動部材8cの一部を挿入するようになっている。   Further, the first moving member 8a has a through hole 86 having a rectangular opening in the middle of the longitudinal direction. The through-hole 86 is formed by a plane whose inner surface disposed on the movable mold 3b side extends in a direction perpendicular to the mold opening / closing direction, and an inner surface (first taper surface 87) facing the inner surface is tapered. Has been. A part of the third moving member 8c is inserted from the side where the opening area of the through hole 86 is large.

第2移動部材8bは、一端側にテーパー面(第2テーパー面88)が形成され、他端が可動側金型3bと接触可能な平面を有する棒状のブロックからなり、長手方向の途中に段部89が形成されている。第2移動部材8bは、固定側金型2bに形成する第2装着穴23に型開閉方向に進退移動するように装着される。第2装着穴23には、第2移動部材8bの段部89を受け止める段部24が形成されている。第2移動部材8bの段部89を固定側金型2bの段部24で受け止めることにより、第2移動部材8bがそれよりも下方、即ち、可動側金型3b側に移動しないようになっている。また、第2移動部材8bの第2テーパー面88は、第1移動部材8a側に向くように形成されている。本実施形態2では、第2移動部材8bが第2ランナ6を第2成形空間42bに対して連通又は遮断可能とする流通規制部90となる。   The second moving member 8b is formed of a bar-shaped block having a tapered surface (second tapered surface 88) formed on one end side and a flat surface on the other end that can come into contact with the movable mold 3b. A portion 89 is formed. The second moving member 8b is mounted in a second mounting hole 23 formed in the fixed mold 2b so as to move forward and backward in the mold opening / closing direction. In the second mounting hole 23, a step portion 24 that receives the step portion 89 of the second moving member 8b is formed. By receiving the stepped portion 89 of the second moving member 8b with the stepped portion 24 of the fixed mold 2b, the second moving member 8b is prevented from moving downward, that is, toward the movable mold 3b. Yes. Moreover, the 2nd taper surface 88 of the 2nd moving member 8b is formed so that it may face the 1st moving member 8a side. In the second embodiment, the second moving member 8b serves as a flow restricting portion 90 that allows the second runner 6 to communicate with or be blocked from the second molding space 42b.

第3移動部材8cは、第1移動部材8aの貫通穴86の第1テーパー面87と当接する第3テーパー面92と、第2移動部材8bの第2テーパー面88と当接する第4テーパー面93とを有するブロックからなる。第3移動部材8cは、その平坦な下面が固定側金型2bの第1装着穴21と第2装着穴23との間に形成される受け部25で受け止められ、この受け部25に接触しながら、水平方向に移動するようになっている。なお、固定側金型2bには、第1装着穴21と第2装着穴23の上方に、これらに連通し、第1移動部材8aの上部と第3移動部材8cとが配置される空間が板部材22で閉鎖されて形成される。第3移動部材8cは、受け部25と板部材22とにより型開閉方向への移動が規制され、第2移動部材8bが可動側金型3bから離れる方向(上方)に移動すると、第2移動部材8bの第2テーパー面88に押されて、第1移動部材8a側に摺動するようになっている。   The third moving member 8c includes a third tapered surface 92 that contacts the first tapered surface 87 of the through hole 86 of the first moving member 8a, and a fourth tapered surface that contacts the second tapered surface 88 of the second moving member 8b. 93. The third moving member 8c is received by a receiving portion 25 formed between the first mounting hole 21 and the second mounting hole 23 of the stationary mold 2b, and the third moving member 8c comes into contact with the receiving portion 25. While moving in the horizontal direction. In the fixed mold 2b, there is a space above the first mounting hole 21 and the second mounting hole 23 in which the upper part of the first moving member 8a and the third moving member 8c are arranged. It is formed by being closed by a plate member 22. The movement of the third moving member 8c in the mold opening / closing direction is restricted by the receiving portion 25 and the plate member 22, and the second movement is performed when the second moving member 8b moves away from the movable mold 3b (upward). It is pushed by the second tapered surface 88 of the member 8b and slides toward the first moving member 8a.

また、第3移動部材8cは、常に、第1移動部材8aの第1テーパー面87と当接しており、第3移動部材8cが第2移動部材8bに押されて第1移動部材8a側に摺動すると、コイルバネ10の付勢力に抗して第1移動部材8aを可動側金型3bから離れる方向に押し上げるようになっている。さらに、第3移動部材8cの第3テーパー面92により、第1移動部材8aの第1テーパー面87を常に受け止めているので、可動側金型3bが固定側金型2bから離れても、第1移動部材8aが第1装着穴21から脱落することはない。また、第3移動部材8cは、第3テーパー面92より上方の上部側面が第1移動部材8aの側面に当接すると第1移動部材8a側への移動が規制され、この時点で第2移動部材8bも上方への移動が規制される。第2移動部材8bの上方への移動が規制された位置が第2移動部材8bの最後退位置となる。   In addition, the third moving member 8c is always in contact with the first tapered surface 87 of the first moving member 8a, and the third moving member 8c is pushed by the second moving member 8b and moves toward the first moving member 8a. When sliding, the first moving member 8a is pushed up in the direction away from the movable mold 3b against the urging force of the coil spring 10. Further, since the first tapered surface 87 of the first moving member 8a is always received by the third tapered surface 92 of the third moving member 8c, even if the movable mold 3b is separated from the fixed mold 2b, The 1 moving member 8a does not fall out of the first mounting hole 21. The third moving member 8c is restricted from moving toward the first moving member 8a when the upper side surface above the third tapered surface 92 abuts against the side surface of the first moving member 8a. The member 8b is also restricted from moving upward. The position where the upward movement of the second moving member 8b is restricted is the last retracted position of the second moving member 8b.

第2ランナ6は、固定側金型2bと可動側金型3bとの間で形成される入口側通路65と、固定側金型2bの第2装着穴23と第2移動部材8bの下面と可動側金型3bの上面との間に形成される容積変動室66と、固定側金型2bと可動側金型3bとの間で形成されて第2成形空間42bに連通する出口側通路67とから構成される。容積変動室66は一端が入口側通路65に連通し、他端が出口側通路67に連通している。   The second runner 6 includes an inlet-side passage 65 formed between the fixed mold 2b and the movable mold 3b, the second mounting hole 23 of the fixed mold 2b, and the lower surface of the second moving member 8b. A volume fluctuation chamber 66 formed between the upper surface of the movable mold 3b and an outlet side passage 67 formed between the fixed mold 2b and the movable mold 3b and communicating with the second molding space 42b. It consists of. One end of the volume fluctuation chamber 66 communicates with the inlet side passage 65 and the other end communicates with the outlet side passage 67.

容積変動室66は、図7に示すように、第2移動部材8bが固定側金型2bの段部24によって受け止められた状態では、第2移動部材8bの下面と可動側金型3bとの間に隙間が形成されるようになっている。そして、第2ランナ6に溶融樹脂が注入されると、図8に示すように、入口側通路65からこの隙間で形成される容積変動室66内に流入するようになっている。   As shown in FIG. 7, the volume fluctuation chamber 66 is formed between the lower surface of the second moving member 8 b and the movable mold 3 b when the second moving member 8 b is received by the step 24 of the fixed mold 2 b. A gap is formed between them. When the molten resin is injected into the second runner 6, as shown in FIG. 8, the molten resin flows from the inlet side passage 65 into the volume fluctuation chamber 66 formed by this gap.

出口側通路67は、固定側金型2bと可動側金型3bとの間に形成され、固定側金型2bの第2装着穴23の壁面に開口させており、第2移動部材8bが上方に移動して最後退位置の手前まで至ると、最大容積となった容積変動室66に連通するように形成されている。さらに、出口側通路67は、容積変動室66へ開口する部分の通路断面積が最も小さくなるように容積変動室66への連通部が先細り状に形成されている。   The outlet side passage 67 is formed between the fixed side mold 2b and the movable side mold 3b, and is opened in the wall surface of the second mounting hole 23 of the fixed side mold 2b, and the second moving member 8b is located upward. When it moves to the position before the last retracted position, it is formed so as to communicate with the volume fluctuation chamber 66 having the maximum volume. Further, the outlet side passage 67 is formed with a tapered communication portion to the volume change chamber 66 so that the passage cross-sectional area of the portion opening to the volume change chamber 66 is minimized.

本実施形態2では、流通規制部90となる第2移動部材8bの下面が受圧面91となり、固定側金型2bの第2装着穴23と受圧面91と可動側金型3bとで囲まれて容積変動室66が形成される。図7に示した第2ランナ6に溶融樹脂が注入されていない状態から、図8に示すように、第2ランナ6に溶融樹脂が注入されて入口側通路65から容積変動室66内に溶融樹脂が流入すると、樹脂の圧力を受圧面91が受けて、第2移動部材8bがコイルバネ10の付勢力に抗して可動側金型3bから離れる方向に移動する。そして、図9に示すように、樹脂圧で第2移動部材8bが最後退位置まで移動するようになっている。   In the second embodiment, the lower surface of the second moving member 8b serving as the flow restricting portion 90 becomes the pressure receiving surface 91, and is surrounded by the second mounting hole 23, the pressure receiving surface 91, and the movable side mold 3b of the fixed mold 2b. Thus, the volume fluctuation chamber 66 is formed. From the state in which the molten resin is not injected into the second runner 6 shown in FIG. 7, the molten resin is injected into the second runner 6 and melted into the volume variation chamber 66 from the inlet side passage 65 as shown in FIG. When the resin flows in, the pressure receiving surface 91 receives the pressure of the resin, and the second moving member 8b moves in a direction away from the movable mold 3b against the urging force of the coil spring 10. As shown in FIG. 9, the second moving member 8b is moved to the last retracted position by the resin pressure.

本実施形態2においてもコイルバネ10の強さは、第2ランナ6に溶融樹脂が注入されていない状態で第2移動部材8bを最進出位置に向けて円滑に摺動させることができ、かつ、容積変動室66内に溶融樹脂が流入して第2移動部材8bの受圧面91が樹脂の圧力を受けたときには、第2移動部材8bがコイルバネ10の押圧付勢力に抗して最後退位置まで摺動できる強さに設定している。尚、本実施形態2も、コイルバネ10は、一つに限らず、コイルバネ10の強さに応じて複数設けることができる。   Also in the second embodiment, the strength of the coil spring 10 can smoothly slide the second moving member 8b toward the most advanced position in the state where the molten resin is not injected into the second runner 6, and When the molten resin flows into the volume variation chamber 66 and the pressure receiving surface 91 of the second moving member 8b receives the pressure of the resin, the second moving member 8b resists the pressing biasing force of the coil spring 10 and reaches the last retracted position. The strength is set to allow sliding. In the second embodiment, the number of coil springs 10 is not limited to one, and a plurality of coil springs 10 can be provided according to the strength of the coil spring 10.

次に、本実施形態2に係る射出成形型1bを用いて2種類の樹脂から成る成形品を成形する工程について説明する。まず、図7に示すように、第2ランナ6に溶融樹脂が注入されていない状態では、第1移動部材8aがコイルバネ10に押圧されて最進出位置になっている。   Next, a process of molding a molded product made of two types of resin using the injection mold 1b according to the second embodiment will be described. First, as shown in FIG. 7, in a state where molten resin is not injected into the second runner 6, the first moving member 8 a is pressed by the coil spring 10 and is in the most advanced position.

この時、第1移動部材8aの下面が可動側金型3bに当接して第1成形空間41bが形成される。この状態で、第1ランナ5から1種類目の溶融樹脂を注入すると、図7に示すように第1成形空間41b内に1種類目の樹脂の射出成形が行なわれ第1成形部分11が成形される。なお、図7に示すように、第1移動部材8aが最進出位置にあるときは、第2移動部材8bも最進出位置にあり、流通規制部90となる第2移動部材8bが出口側通路67を塞いだ状態になっており、第2ランナ6は第2移動部材8bにより連通が遮断された状態になっている。   At this time, the lower surface of the first moving member 8a comes into contact with the movable mold 3b to form the first molding space 41b. When the first type of molten resin is injected from the first runner 5 in this state, the first type of resin is injection-molded into the first molding space 41b as shown in FIG. Is done. As shown in FIG. 7, when the first moving member 8 a is in the most advanced position, the second moving member 8 b is also in the most advanced position, and the second moving member 8 b serving as the flow restricting portion 90 is connected to the outlet side passage. 67 is closed, and the second runner 6 is in a state where communication is blocked by the second moving member 8b.

そして、図8に示すように、第2ランナ6に溶融樹脂が注入されると、入口側通路65から容積変動室66内に溶融樹脂が流入して第2移動部材8bの受圧面91が樹脂の圧力を受け、第2移動部材8bがコイルバネ10の押圧付勢力に抗して後退し始める。このとき、出口側通路67は、第2移動部材8bがほぼ最後退位置となるまで、この第2移動部材8bで封鎖された状態になっており、出口側通路67が第2移動部材8bによって封鎖されている間は、第2成形空間42bは、第1移動部材8aの後退により徐々に容積が増大していくが溶融樹脂は第2成形空間42bには流入しない。   As shown in FIG. 8, when the molten resin is injected into the second runner 6, the molten resin flows into the volume variation chamber 66 from the inlet side passage 65, and the pressure receiving surface 91 of the second moving member 8b becomes the resin. The second moving member 8b starts to retract against the pressing biasing force of the coil spring 10. At this time, the outlet side passage 67 is in a state of being blocked by the second moving member 8b until the second moving member 8b is substantially at the most retracted position, and the outlet side passage 67 is blocked by the second moving member 8b. While sealed, the volume of the second molding space 42b gradually increases as the first moving member 8a moves backward, but the molten resin does not flow into the second molding space 42b.

さらに、第2移動部材8bの受圧面91が樹脂の圧力を受け、図9に示すように、第2移動部材8bが最後退位置まで後退すると、第1移動部材8aも第3移動部材8cの動きに伴って最後退位置まで移動し、第2成形空間42bが最大容積となる。そして、出口側通路67が容積変動室66と連通して、溶融樹脂が出口側通路67そして第2ゲート60を介して第2成形空間42bに流入し、第2成形空間42bによる射出成形が行なわれ、第2成形部分12が成形される。なお、出口側通路67は、第2移動部材8bの最後退位置の手前で容積変動室66と連通するが、出口側通路67の容積変動室66への連通部が先細り状に形成され、出口側通路67の長さは第2移動部材8bが最後退位置に至った時点で溶融樹脂が第2成形空間42b内に流入しない長さとしている。従って、第2移動部材8bが最後退位置に至った後に、第2成形空間42bに溶融樹脂を流入させることができる。   Further, when the pressure receiving surface 91 of the second moving member 8b receives the pressure of the resin and the second moving member 8b is retracted to the last retracted position as shown in FIG. 9, the first moving member 8a is also moved to the third moving member 8c. It moves to the last retracted position with the movement, and the second molding space 42b becomes the maximum volume. The outlet side passage 67 communicates with the volume variation chamber 66, and the molten resin flows into the second molding space 42b through the outlet side passage 67 and the second gate 60, and injection molding is performed in the second molding space 42b. Thus, the second molded portion 12 is molded. The outlet side passage 67 communicates with the volume fluctuation chamber 66 before the last retracted position of the second moving member 8b, but the communication portion of the outlet side passage 67 to the volume fluctuation chamber 66 is formed in a tapered shape. The length of the side passage 67 is set such that the molten resin does not flow into the second molding space 42b when the second moving member 8b reaches the last retracted position. Therefore, the molten resin can be caused to flow into the second molding space 42b after the second moving member 8b reaches the last retracted position.

本実施形態2では、図9に示すように、第2移動部材8bが最後退位置まで移動したときに、既に成形されている第1成形部分11の端面と可動側金型3bと第1移動部材8aの下面と固定側金型2bとで囲まれた空間により最大容積の第2成形空間42bが形成され、第2成形空間42bに流入した溶融樹脂は第1成形部分11と一体化し、第2成形部分12が成形される。   In the second embodiment, as shown in FIG. 9, when the second moving member 8b moves to the last retracted position, the end surface of the first molded portion 11 that has already been molded, the movable mold 3b, and the first movement. A space surrounded by the lower surface of the member 8a and the fixed mold 2b forms a second molding space 42b having a maximum volume, and the molten resin flowing into the second molding space 42b is integrated with the first molding portion 11, Two molded parts 12 are molded.

以上のように、本実施形態2に係る射出成形型1bは、第2ランナ6に溶融樹脂が注入されると流通規制部90となる第2移動部材8bが溶融樹脂の圧力を受けることによりコイルバネ10の付勢力に抗して第1移動部材8a及び第2移動部材8bが最進出位置から後退していくようになっている。   As described above, in the injection mold 1b according to the second embodiment, when the molten resin is injected into the second runner 6, the second moving member 8b serving as the flow restricting portion 90 receives the pressure of the molten resin. The first moving member 8a and the second moving member 8b move backward from the most advanced position against the urging force of 10.

すなわち、第1ランナ5から1種類目の溶融樹脂を第1成形空間41bに流入させるときには第1移動部材8a及び第2移動部材8bを最進出位置に位置させて第1成形空間41bを形成し、この第1成形空間41bで射出成形が行なわれる。   That is, when the first type of molten resin flows from the first runner 5 into the first molding space 41b, the first molding member 41a is formed by positioning the first moving member 8a and the second moving member 8b at the most advanced position. The injection molding is performed in the first molding space 41b.

そして、図8に示すように、第2ランナ6の入口側通路65から2種類目の溶融樹脂が容積変動室66内に流入していくと、第2移動部材8bは、受圧面91が溶融樹脂の圧力を受けて最進出位置から後退していき、図9に示すように、第2移動部材8bが最後退位置に到達する直前に、第2移動部材8bにより塞がれていた出口側通路67が容積変動室66内と連通して、出口側通路67から最大容積となった第2成形空間42bに溶融樹脂が流入して射出成形が行なわれる。   Then, as shown in FIG. 8, when the second type of molten resin flows into the volume fluctuation chamber 66 from the inlet side passage 65 of the second runner 6, the pressure receiving surface 91 of the second moving member 8b is melted. As shown in FIG. 9, the outlet side is closed by the second moving member 8b immediately before the second moving member 8b reaches the last retracted position. The passage 67 communicates with the inside of the volume change chamber 66, and the molten resin flows into the second molding space 42b having the maximum volume from the outlet side passage 67, and injection molding is performed.

本実施形態2の射出成形型によれば、コイルバネ10により進出させておいた第1移動部材8aを第2成形空間42bに流入させる溶融樹脂を容積変動室66に流し込むようにして第2移動部材8b及び第3移動部材8cを移動させることで簡単に後退させることができる。   According to the injection molding die of the second embodiment, the second moving member is configured such that the molten resin that causes the first moving member 8a that has been advanced by the coil spring 10 to flow into the second molding space 42b flows into the volume fluctuation chamber 66. By moving the 8b and the third moving member 8c, it can be easily retracted.

しかも、樹脂圧を利用して各移動部材を移動させる際に、第2成形空間42bが最大容積になるまでは、第2成形空間42bに溶融樹脂が流入しないので、最初に成形した第1成形部分11と後から成形した第2成形部分12との境界で生じるせん断によって割れが生じたり、層状の樹脂ムラが発生したりすることを阻止することができ、異質材料間の接着強度を向上でき品質の安定した2種同時成形が可能となる。   In addition, when the moving members are moved using the resin pressure, the molten resin does not flow into the second molding space 42b until the second molding space 42b reaches the maximum volume. It is possible to prevent the occurrence of cracks or the occurrence of layered resin unevenness due to the shear generated at the boundary between the portion 11 and the second molded portion 12 formed later, and improve the adhesive strength between different materials. Two types of molding with stable quality can be performed simultaneously.

なお、本発明は、上記実施形態に係る射出成形型に限定されるもではなく、本発明の技術的範囲において種々の変形が可能である。また、本発明は、単数の製品を成形するものに限らず、複数の製品を一度に形成するものにも適用できる。   The present invention is not limited to the injection mold according to the above embodiment, and various modifications can be made within the technical scope of the present invention. Further, the present invention is not limited to molding a single product, but can also be applied to a product that forms a plurality of products at a time.

1a 射出成形型
1b 射出成形型
2a 固定側金型
2b 固定側金型
3a 可動側金型
3b 可動側金型
5 第1ランナ
6 第2ランナ
7 スライドコア
8 移動部材
8a 第1移動部材
8b 第2移動部材
8c 第3移動部材
10 コイルバネ
11 第1成形部分
12 第2成形部分
41a 第1成形空間
41b 第1成形空間
42a 第2成形空間
42b 第2成形空間
61 入口側通路
62 上流側通路
63 容積変動室
64 下流側通路
65 入口側通路
66 容積変動室
67 出口側通路
81 曲面
83 流通規制部
84 受圧面
90 流通規制部
91 受圧面
DESCRIPTION OF SYMBOLS 1a Injection mold 1b Injection mold 2a Fixed side mold 2b Fixed side mold 3a Movable side mold 3b Movable side mold 5 First runner 6 Second runner 7 Slide core 8 Moving member 8a First moving member 8b Second Moving member 8c Third moving member 10 Coil spring 11 First forming portion 12 Second forming portion 41a First forming space 41b First forming space 42a Second forming space 42b Second forming space 61 Inlet side passage 62 Upstream side passage 63 Volume variation Chamber 64 Downstream side passage 65 Inlet side passage 66 Volume variation chamber 67 Outlet side passage 81 Curved surface 83 Flow restricting portion 84 Pressure receiving surface 90 Flow restricting portion 91 Pressure receiving surface

Claims (3)

接合状態で成形空間を形成する複数の金型と、前記金型に対して往復移動可能に設けられ、前記成形空間の容積を変化させる移動部材と、当該移動部材を前記成形空間の容積が減少する方向に押圧付勢する付勢部材とを備え、
前記成形空間は、前記移動部材が前記付勢部材に押圧されて最進出位置にある時に形成される第1成形空間と、前記移動部材が最進出位置から最後退位置まで移動して形成される第2成形空間とからなり、
第1成形空間に溶融樹脂を流入する第1ランナと、第2成形空間に溶融樹脂を流入する第2ランナとを有し、
前記移動部材は、その一部に第2ランナを第2成形空間に対して連通又は遮断可能とする流通規制部を有しており、当該流通規制部は第2ランナに注入された溶融樹脂の圧力を受ける受圧面を有し、前記流通規制部により第2ランナと第2成形空間との間を遮断しながら、前記受圧面が溶融樹脂の圧力を受けることにより前記付勢部材の付勢力に抗して前記移動部材を後退させて第2成形空間を形成し、第2成形空間が形成されると第2ランナと第2成形空間とが連通されて溶融樹脂が第2成形空間に流入する構成となっていることを特徴とする射出成形型。
A plurality of molds that form a molding space in a joined state, a movable member that is reciprocally movable with respect to the mold, and that changes the volume of the molding space. A biasing member that presses and biases in a direction to
The molding space is formed by a first molding space formed when the moving member is pressed by the biasing member and located at the most advanced position, and the moving member is moved from the most advanced position to the last retracted position. A second molding space,
A first runner that flows molten resin into the first molding space; and a second runner that flows molten resin into the second molding space;
The moving member has a flow restricting portion that allows the second runner to communicate with or shut off the second runner at a part of the moving member, and the flow restricting portion includes the molten resin injected into the second runner. A pressure receiving surface that receives pressure, and the flow restricting portion blocks the space between the second runner and the second molding space, and the pressure receiving surface receives the pressure of the molten resin to thereby apply the biasing force of the biasing member. The moving member is moved backward to form a second molding space, and when the second molding space is formed, the second runner and the second molding space are communicated with each other, and the molten resin flows into the second molding space. An injection mold characterized by comprising.
請求項1に記載の射出成形型において、
前記金型が固定側金型と可動側金型を有し、前記移動部材が前記可動側金型の型開閉方向と直交する方向に移動可能に設けられており、
第2ランナの一部が前記可動側金型と前記移動部材との間に形成され、
前記流通規制部は、前記移動部材における可動側金型との対向面に形成される凸部により構成され、
前記可動側金型に前記凸部が進退移動可能に収納される凹部を形成して、この凹部に前記凸部を収納することにより第2ランナの一部となる容積変動室を構成し、前記凸部が前記容積変動室に流入する溶融樹脂の圧力を受けることにより前記移動部材が最進出位置から最後退位置に移動するまでは前記凸部により第2ランナを第2成形空間に対して遮断する構成としている射出成形型。
The injection mold according to claim 1,
The mold has a fixed mold and a movable mold, and the moving member is provided so as to be movable in a direction orthogonal to a mold opening / closing direction of the movable mold,
A part of the second runner is formed between the movable mold and the moving member,
The distribution restriction part is constituted by a convex part formed on a surface of the moving member facing the movable side mold,
Forming a concave portion in which the convex portion is accommodated in the movable mold so as to be movable forward and backward, and constituting the volume fluctuation chamber that becomes a part of the second runner by accommodating the convex portion in the concave portion; The second runner is blocked from the second molding space by the convex portion until the moving member moves from the most advanced position to the last retracted position by receiving the pressure of the molten resin flowing into the volume fluctuation chamber. An injection mold that is configured to perform.
請求項1に記載の射出成形型において、
前記金型が固定側金型と可動側金型とを有し、前記移動部材が前記可動側金型の型開閉方向と同方向に移動可能に設けられる第1移動部材及び第2移動部材と、型開閉方向と直交する方向に移動可能に設けられる第3移動部材とを備え、
第1移動部材は、前記付勢部材により前記成形空間の容積が減少する方向に押圧付勢され、この付勢部材による付勢力に抗して移動することにより第2成形空間を形成し、
第2移動部材は、往復移動により第2ランナを第2成形空間に対して連通又は遮断可能とする流通規制部となり、前記受圧面が型開閉方向と同方向に作用するように設けられており、
第3移動部材は、第1移動部材とテーパー面同士で当接されると共に、第2移動部材ともテーパー面同士で当接しており、第2移動部材が樹脂圧を受けて移動することにより、各テーパー面同士の押圧により第1移動部材を付勢部材による付勢力に抗して移動させる構成としている射出成形型。
The injection mold according to claim 1,
The mold includes a fixed mold and a movable mold, and the moving member is provided so as to be movable in the same direction as the mold opening / closing direction of the movable mold. A third moving member provided to be movable in a direction orthogonal to the mold opening and closing direction,
The first moving member is pressed and urged in a direction in which the volume of the molding space decreases by the urging member, and forms a second molding space by moving against the urging force by the urging member,
The second moving member serves as a flow restricting portion that allows the second runner to communicate with or shut off from the second molding space by reciprocating movement, and is provided such that the pressure receiving surface acts in the same direction as the mold opening / closing direction. ,
The third moving member is abutted between the first moving member and the tapered surfaces, and the second moving member is also abutted between the tapered surfaces, and the second moving member is moved by receiving the resin pressure, An injection mold in which the first moving member is moved against the urging force of the urging member by pressing the tapered surfaces.
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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

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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

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