JP2005081611A

JP2005081611A - Injection mold and resin molded product

Info

Publication number: JP2005081611A
Application number: JP2003314175A
Authority: JP
Inventors: Hirokatsu Hiraoka; 寛勝平岡
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2003-09-05
Filing date: 2003-09-05
Publication date: 2005-03-31

Abstract

PROBLEM TO BE SOLVED: To reduce necessary mold clamping force by ensuring the flow rate to an auxiliary runner in an injection-molded product using a resin material. SOLUTION: In the injection-molded product using the resin material, a flow supporting gate for supporting the flow of the resin material is installed. COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、射出成形金型、及び樹脂成形品に関する。 The present invention relates to an injection mold and a resin molded product.

従来、金型を用いた射出成形により製造される樹脂成形品は、金型内のキャビティ内にゲートから樹脂を供給、充填し、冷却後に開型することにより取り出される。ゲートからキャビティ内に供給するだけでは、キャビティ内の隅々にまで樹脂が行き渡らない場合には、補助ランナーによる流動支援を行うことがあるが、樹脂成形品の他の部分に樹脂が流れてしまい、補助ランナーへ充分な流量を確保できないという不具合がある。このような樹脂成形に関する問題に対応するものとして、例えば、特許文献１及び２等に記載の技術がある。
特開平８−３００４１６号公報特開平５−０００４３０号公報 Conventionally, a resin molded product manufactured by injection molding using a mold is taken out by supplying and filling a resin from a gate into a cavity in the mold and opening the mold after cooling. If the resin does not reach all corners of the cavity simply by supplying it from the gate, the auxiliary runner may assist the flow, but the resin will flow to other parts of the resin molded product. There is a problem that a sufficient flow rate cannot be secured to the auxiliary runner. For example, Patent Documents 1 and 2 disclose techniques for dealing with such problems relating to resin molding.
JP-A-8-300416 Japanese Patent Laid-Open No. 5-000430

前述の従来技術には、樹脂の最終末端部まで樹脂は流れるが、必要型締め力の低減に関しては効果が少ないという欠点があった。
本発明は従来の問題点に着目し、補助ランナーへの流量を確保して、必要型締め力の低減を図ることを目的とする。 The aforementioned prior art has the drawback that the resin flows to the final end of the resin, but is less effective in reducing the required clamping force.
The present invention focuses on the conventional problems and aims to secure a flow rate to the auxiliary runner and reduce the required clamping force.

上記目的を達成するために、請求項１記載の発明は、樹脂材料を用いた射出成形品を成形するための金型において、通常のゲートの他に、樹脂の流動支援を行う流動支援用ゲートが設置されていることを特徴とする。
請求項２の発明は、請求項１の射出成形金型において、流動支援用ゲートの近傍に流動支援のための補助ランナーが設置されていることを特徴とする。
請求項３の発明は、請求項１または２の射出成形金型において、流動支援用ゲートと補助ランナーとの間のキャビティが樹脂流量を増大させる幅広部になっていることを特徴とする。
請求項４の発明は、請求項１または２の射出成形金型において、流動支援用ゲートと補助ランナーの間が他と比べて薄肉部になっていることを特徴とする。
請求項５の発明は、請求項１または２の射出成形金型において、流動支援用ゲートと補助ランナーの間に他と比べて厚肉部と薄肉部が形成されていることを特徴とする。
請求項６の発明は、請求項１乃至５の何れか一項の射出成形金型により成形されたことを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a mold for molding an injection-molded article using a resin material, in addition to a normal gate, a flow support gate for supporting resin flow. Is installed.
According to a second aspect of the present invention, in the injection mold of the first aspect, an auxiliary runner for flow support is installed in the vicinity of the flow support gate.
According to a third aspect of the present invention, in the injection mold according to the first or second aspect, the cavity between the flow assisting gate and the auxiliary runner is a wide portion that increases the resin flow rate.
According to a fourth aspect of the present invention, in the injection mold according to the first or second aspect, the portion between the flow support gate and the auxiliary runner is a thinner portion than the others.
According to a fifth aspect of the present invention, in the injection mold according to the first or second aspect, a thicker portion and a thinner portion are formed between the flow assisting gate and the auxiliary runner as compared with the others.
The invention of claim 6 is characterized by being molded by the injection mold according to any one of claims 1 to 5.

本発明によれば、補助ランナーへの流量を確保して、必要型締め力の低減を図ることができる。 According to the present invention, it is possible to secure a flow rate to the auxiliary runner and reduce the required clamping force.

以下、本発明の実施の形態を図面に従って説明する。
図１は本発明の実施の形態に係る金型により成形された樹脂成形品の外観図、図２は図１のＡ部の拡大図である。また、図３は本発明の金型の要部構成を示す断面図である。
図１に示した樹脂成形品は、金型を開いた際の状態を示しており、前面が開口した箱形の樹脂成形品１は、その上面に２本のゲート転写部２と、一本の流動支援のためのゲート転写部３を備え、更に前面開口の上部から下部にかけて略コ字状の流動支援のための補助ランナー転写部４が配置されている。ゲート転写部２は、金型のゲート内に残留した樹脂が開型後に成形品１に連続した状態で取り出されたものである。流動支援のためのゲート転写部３は、２本の本来のゲートの他に設けられる補助ゲートから転写された形状部であり、この例では図３に示した補助ランナー４Ａに対する樹脂の供給を円滑化するための樹脂供給路の形状が転写されたものである。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a resin molded product molded by a mold according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 is a cross-sectional view showing the main configuration of the mold of the present invention.
The resin molded product shown in FIG. 1 shows a state when the mold is opened. A box-shaped resin molded product 1 having an open front surface has two gate transfer portions 2 and one on the upper surface. Is provided with a gate transfer portion 3 for supporting the flow, and an auxiliary runner transfer portion 4 for supporting a substantially U-shaped flow from the upper part to the lower part of the front opening. The gate transfer portion 2 is one in which the resin remaining in the gate of the mold is taken out in a state of being continuous with the molded product 1 after being opened. The gate transfer portion 3 for flow support is a shape portion transferred from an auxiliary gate provided in addition to the two original gates. In this example, the resin is smoothly supplied to the auxiliary runner 4A shown in FIG. The shape of the resin supply path for converting into a shape is transferred.

図２は流動支援のためのゲート転写部３と補助ランナー転写部４とを結ぶ成形品上面の形状を示す斜視図であり、ゲート転写部３の先端と成形品上面との接合部の周囲には所要面積で上面が平坦な高所（厚肉部）５があり、高所５の外周にはコ字状の溝６があり、溝６の外側には平坦面７（平坦面７は厚肉部５よりも薄肉部としてもよい）７がある。高所５はその前方端縁にて補助ランナー転写部４の上部と連続している。
図３は図２の如き形状を製作するための金型の要部構成図であり、この金型は、固定金型１０と、可動金型１１と、スライド型１２と、を有し、各金型１０、１１、１２によって成形品１を成型するためのキャビティ１５が形成される。固定型１０の下面には成形品の高所５と溝６を夫々形成するための凹所１０ａと凸所１０ｂが形成されている。固定型１０内には凹所１０ａに達する流路支援ゲート３Ａが貫通形成されている。また、可動金型１１とスライド型１２との間には補助ランナー転写部４を形成する補助ランナー４Ａが形成されている。
流路支援ゲート３Ａから供給されたキャビティ１５内に供給される樹脂は、矢印の経路を経て補助ランナー４Ａ内に入り、図１に示した補助ランナー転写部４を形成する。即ち、流路支援ゲート３Ａから流下した樹脂は凹所１０ａと可動金型１１の上面との間の幅の広いキャビティ内に入って流動性を高め、更に補助ランナー４Ａの方向へ狙いを定めて流動して補助ランナー４Ａ内に流入し、更に補助ランナー４Ａ内を流下してキャビティ１５の下方へ隅々にまで展開することができる。特に、流動支援ゲート３Ａと補助ランナー４Ａとの間の距離ａを短くすることにより、補助ランナーへ向かう樹脂の流量をより多く確保することができる。
このように本発明の樹脂成形品１を成形するための金型にあっては、樹脂成形品を成形するための本来のゲートとは別に、流動支援のための流動支援用ゲート３Ａを設け、更に流動支援用ゲート３Ａとは別に、流動支援のための補助ランナー４Ａを有する。樹脂成形品１を成形するためのゲートとは別に流動支援用ゲート３Ａを設けることにより、流動支援のための補助ランナー４Ａへの樹脂の流量を充分に確保することができる。
また本実施形態では、図２に示すように、流動支援用ゲート３Ａと補助ランナー４Ａとの距離ａを短くすることにより、樹脂の流量をより多く確保することができる。また本実施形態では、流動支援用ゲート３Ａと補助ランナー４Ａとの間に他と比べて厚肉部５と溝６が形成されるように金型の形状を構成しているので、補助ランナー４Ａへ向かう流量を確保することができる。なお、厚肉部５と溝６のいずれか一方のみを形成してもよい。また、厚肉部５の代わりに、薄肉部を設けても良い。
このような構造にすることで、樹脂成形品の他の部分に樹脂が流れることを抑えて流動支援のための補助ランナー４Ａへの流量を確保する効果をさらに高めることができる。 FIG. 2 is a perspective view showing the shape of the upper surface of the molded product connecting the gate transfer portion 3 and the auxiliary runner transfer portion 4 for flow support, and around the joint between the tip of the gate transfer portion 3 and the upper surface of the molded product. Has a high area (thick part) 5 with a required area and a flat upper surface, a U-shaped groove 6 on the outer periphery of the high area 5, and a flat surface 7 (the flat surface 7 is thick on the outside of the groove 6). 7 may be thinner than the meat part 5). The height 5 is continuous with the upper part of the auxiliary runner transfer portion 4 at the front edge.
FIG. 3 is a configuration diagram of a main part of a mold for producing the shape as shown in FIG. 2, and this mold has a fixed mold 10, a movable mold 11, and a slide mold 12. A cavity 15 for molding the molded product 1 is formed by the molds 10, 11, and 12. On the lower surface of the fixed mold 10, there are formed a recess 10a and a protrusion 10b for forming a height 5 and a groove 6 of the molded product, respectively. A flow path support gate 3 A reaching the recess 10 a is formed through the fixed mold 10. In addition, an auxiliary runner 4 A that forms the auxiliary runner transfer portion 4 is formed between the movable mold 11 and the slide mold 12.
The resin supplied into the cavity 15 supplied from the flow path support gate 3A enters the auxiliary runner 4A through the path indicated by the arrow, and forms the auxiliary runner transfer portion 4 shown in FIG. That is, the resin flowing down from the flow path support gate 3A enters a wide cavity between the recess 10a and the upper surface of the movable mold 11 to improve the fluidity, and further aim toward the auxiliary runner 4A. It flows and flows into the auxiliary runner 4 A, and further flows down through the auxiliary runner 4 A and can be developed to the bottom of the cavity 15. In particular, by shortening the distance a between the flow support gate 3A and the auxiliary runner 4A, it is possible to secure a larger amount of resin flow toward the auxiliary runner.
Thus, in the mold for molding the resin molded product 1 of the present invention, a flow support gate 3A for flow support is provided separately from the original gate for molding the resin molded product, In addition to the flow support gate 3A, there is an auxiliary runner 4A for flow support. By providing the flow support gate 3A separately from the gate for molding the resin molded product 1, the flow rate of the resin to the auxiliary runner 4A for flow support can be sufficiently secured.
Moreover, in this embodiment, as shown in FIG. 2, the flow rate of resin can be ensured more by shortening the distance a between the flow support gate 3A and the auxiliary runner 4A. Moreover, in this embodiment, since the shape of a metal mold | die is comprised so that the thick part 5 and the groove | channel 6 may be formed between 3 A of flow assistance gates, and auxiliary runner 4A compared with others, auxiliary runner 4A. It is possible to secure a flow rate toward Only one of the thick part 5 and the groove 6 may be formed. Further, instead of the thick part 5, a thin part may be provided.
By adopting such a structure, it is possible to further enhance the effect of securing the flow rate to the auxiliary runner 4A for flow support by suppressing the flow of the resin to the other part of the resin molded product.

本発明の実施の形態に係る樹脂成形品の外観図。The external view of the resin molded product which concerns on embodiment of this invention. 図１のＡ部の拡大図。The enlarged view of the A section of FIG. 本発明の成形品を成形するための金型の要部断面図。The principal part sectional drawing of the metal mold | die for shape | molding the molded article of this invention.

Explanation of symbols

１樹脂成形品、２ゲート、３流動支援用ゲート転写部、３Ａ流動支援用ゲート、４補助ランナー転写部、４Ａ補助ランナー、５厚肉部、６溝部、７平坦部（薄肉部） 1 resin molded product, 2 gate, 3 flow support gate transfer part, 3A flow support gate, 4 auxiliary runner transfer part, 4A auxiliary runner, 5 thick part, 6 groove part, 7 flat part (thin part)

Claims

An injection mold for molding an injection-molded article using a resin material, wherein a flow support gate for supporting the flow of resin is installed in addition to a normal gate.

The injection mold according to claim 1, wherein an auxiliary runner for flow support is installed in the vicinity of the flow support gate.

3. The injection mold according to claim 1, wherein a cavity between the flow assisting gate and the auxiliary runner is a wide part for increasing a resin flow rate.

3. The injection mold according to claim 1, wherein a space between the flow support gate and the auxiliary runner is thinner than the others.

3. The injection mold according to claim 1, wherein a thick part and a thin part are formed between the flow assisting gate and the auxiliary runner as compared with the others.

A resin molded product, which is molded by the injection mold according to any one of claims 1 to 5.