JP2014166699A

JP2014166699A - Injection molding die

Info

Publication number: JP2014166699A
Application number: JP2013038921A
Authority: JP
Inventors: Jun Ejiri; 純江尻; Yuji Ariki; 雄二有木; Yohei Chingyo; 陽平珍行; Tomoyuki Imamura; 友幸今村
Original assignee: Stanley Electric Co Ltd
Current assignee: Stanley Electric Co Ltd
Priority date: 2013-02-28
Filing date: 2013-02-28
Publication date: 2014-09-11

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding die capable of preventing the rolling and deformation of a product upon release, thus preventing deteriorating in merchantability.SOLUTION: In the injection molding die where a molten raw material is filled into a cavity S formed by a cavity die 1 on a fixed side and a core die 2 on a movable side, and, when the filled molten raw material is cooled and solidified, the core die 2 is pulled out to discharge a product, recessed parts 3 (or projecting parts) along the pulling out direction of the core die 2 are formed at the cavity face 2a facing the cavity S in the core die 2. Further, the recessed parts 3 (or projecting parts) are formed at a plurality of the parts in the cavity face 2a of the core die 2.

Description

本発明は、固定側のキャビティ型と可動側のコア型を備える射出成形金型に関するものである。 The present invention relates to an injection mold including a fixed cavity mold and a movable core mold.

例えば、樹脂の射出成形においては、図５の断面図に示すように、固定側のキャビティ型１０１と可動側のコア型１０２によって形成されたキャビティ（成形空間）Ｓに成形機によって溶融樹脂を充填し、充填された溶融樹脂が冷却されて固化すると、コア型１０２を図示矢印方向に抜いて（離型して）製品（樹脂成形品）を取り出すことが行われている。 For example, in resin injection molding, as shown in the cross-sectional view of FIG. 5, a molding machine fills a cavity (molding space) S formed by a cavity mold 101 on the fixed side and a core mold 102 on the movable side. Then, when the filled molten resin is cooled and solidified, the core mold 102 is pulled out (released) in the direction of the arrow in the figure, and a product (resin molded product) is taken out.

ところで、製品を取り出す離型時には製品はキャビティ型１０１から離れてコア型１０２と共に抜かれるが、製品のキャビティ型１０１側の面が意匠面を構成する場合には、キャビティ型１０１のキャビティＳに面するキャビティ面１０１ａが鏡面研磨加工によって平滑な面に仕上げられるため、又、製品の成形収縮のために、製品がキャビティ型１０１に張り付いて残ってしまうという不具合が発生する。 By the way, when releasing the product, the product is separated from the cavity mold 101 and removed together with the core mold 102. However, when the surface of the product on the cavity mold 101 side constitutes a design surface, the product faces the cavity S of the cavity mold 101. Since the cavity surface 101a to be finished is finished to a smooth surface by mirror polishing, there is a problem that the product remains stuck to the cavity mold 101 due to molding shrinkage of the product.

そこで、従来は、図５に示すようにコア型１０２のキャビティＳに面するキャビティ面１０２ａにアンダーカット形状の突起１０２ｂを複数形成し、前記不具合の発生を防ぐようにしていた。 Therefore, conventionally, a plurality of undercut protrusions 102b are formed on the cavity surface 102a facing the cavity S of the core mold 102 as shown in FIG.

ところで、特許文献１には、見栄えの良い成形品を得る目的で、パーティングラインを製品の外観上目立たない位置に形成するための金型構造が提案されている。 By the way, Patent Document 1 proposes a mold structure for forming a parting line at a position that is not conspicuous in terms of the appearance of the product for the purpose of obtaining a molded product having a good appearance.

又、特許文献２には、製品にウェルドラインを発生させないために、キャビティに面するキャビティ面のうち、成形品の少なくとも表側となる面に対応するキャビティ面に、成形後は成形品と離型して金型側に残る樹脂層を設けた射出成形金型が提案されている。 Further, in Patent Document 2, in order not to generate a weld line in the product, a cavity surface corresponding to at least a front surface of the molded product among the cavity surfaces facing the cavity is formed and released from the molded product after molding. An injection mold having a resin layer remaining on the mold side has been proposed.

特開２０１１−０８８３３３号公報JP 2011-088333 A 特開平１０−１８０８１８号公報Japanese Patent Laid-Open No. 10-180818

例えば、ヘッドランプ等の車両用灯具に設けられる樹脂成形品であるエクステンション等は、形状が複雑で、金型食い切り形状の部分が多く、強度が不足しているものが多い。そして、意匠のヒケや成形性の悪化等によってアンダーカットを設定することができる部分も限られ、アンダーカットを設定していない部分が変形したり、離型時に製品に横振れや変形が生じ、製品の意匠面がキャビティ型によって擦られるために該意匠面の外観や性能が悪化して商品性が低下するという問題が発生する。 For example, an extension or the like, which is a resin molded product provided in a vehicular lamp such as a headlamp, has a complicated shape, has many die-cut portions, and often lacks strength. And the part where the undercut can be set due to the sink mark of the design or the deterioration of the moldability is limited, the part where the undercut is not set is deformed, or the product is shaken or deformed at the time of release, Since the design surface of the product is rubbed by the cavity mold, the appearance and performance of the design surface are deteriorated, resulting in a problem that the merchantability is lowered.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、離型時の製品の横振れや変形を防いで商品性の低下を防ぐことができる射出成形金型を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection mold that can prevent the product from being shaken and deformed at the time of mold release, thereby preventing deterioration in merchantability. It is in.

上記目的を達成するため、請求項１記載の発明は、固定側のキャビティ型と可動側のコア型によって形成されるキャビティに溶融原料を充填し、充填した溶融原料が冷却されて固化すると、前記コア型を抜いて製品を取り出す射出成形金型において、前記コア型の前記キャビティに面するキャビティ面に、当該コア型の抜き方向に沿う凹部又は凸部を形成したことを特徴とする。 In order to achieve the above object, according to the first aspect of the present invention, when the molten raw material is filled in a cavity formed by the cavity mold on the fixed side and the core mold on the movable side, and the filled molten raw material is cooled and solidified, In the injection mold for removing the core mold and taking out the product, the cavity surface of the core mold facing the cavity is formed with a concave portion or a convex portion along the drawing direction of the core die.

請求項２記載の発明は、請求項１記載の発明において、前記凹部又は凸部を前記コア型のキャビティ面の複数箇所に形成したことを特徴とする。 According to a second aspect of the present invention, in the first aspect of the present invention, the concave portion or the convex portion is formed at a plurality of locations on the cavity surface of the core mold.

請求項１記載の発明によれば、製品を取り出す離型時において、製品にはコア型のキャビティ面に形成された凹部又は凸部に嵌合する凸部又は凹部が形成され、両者が凹凸嵌合するため、製品を取り出す離型時において該製品の横振れや変形が防がれ、製品の意匠面とキャビティ型との擦れが防がれ、製品の外観や性能の低下が防がれて該製品には高い商品性が確保される。 According to the first aspect of the present invention, at the time of releasing the product, the product is formed with a concave portion or a concave portion formed on the cavity surface of the core mold, and the concave portion and the concave portion are both fitted. Therefore, when the product is removed from the mold, it can be prevented from sideways and deforming, and the design surface of the product and the cavity mold can be prevented from rubbing, and the appearance and performance of the product can be prevented from deteriorating. The product ensures high merchantability.

請求項２記載の発明によれば、コア型のキャビティ面の複数箇所に凹部又は凸部を形成したため、これらの凹部又は凸部によって製品が保持されてその変形が防がれるとともに、離型時の横振れが一層確実に防がれる。 According to the second aspect of the present invention, since the recesses or projections are formed at a plurality of locations on the cavity surface of the core mold, the product is held by these recesses or projections to prevent the deformation, and at the time of mold release Lateral runout is more reliably prevented.

本発明に係る射出成形金型の断面図である。It is sectional drawing of the injection mold which concerns on this invention. 図１のＡ部拡大詳細図である。It is the A section enlarged detail drawing of FIG. （ａ）〜（ｃ）は本発明に係る射出成形金型を用いた射出成形手順をその工程順に示す断面図である。(A)-(c) is sectional drawing which shows the injection molding procedure using the injection mold which concerns on this invention in the order of the process. 本発明の別形態を示す図２と同様の図である。It is a figure similar to FIG. 2 which shows another form of this invention. 従来の射出成形金型の断面図である。It is sectional drawing of the conventional injection mold.

以下に本発明の実施の形態を添付図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は本発明に係る射出成形金型の断面図、図２は図１のＡ部拡大詳細図であり、本発明に係る射出成形金型は、例えば、ヘッドランプ等の車両用灯具に設けられるエクステンション等の樹脂成形品を射出成形するためのものであって、固定側のキャビティ型１と可動側のコア型２を備えている。 FIG. 1 is a cross-sectional view of an injection mold according to the present invention, FIG. 2 is an enlarged detail view of part A of FIG. 1, and the injection mold according to the present invention is provided in a vehicle lamp such as a headlamp. This is for injection molding of a resin molded product such as an extension, and includes a cavity mold 1 on the fixed side and a core mold 2 on the movable side.

上記キャビティ型１とコア型２が図１に示すように接合された状態では、これらの間には製品形状に合致するキャビティ（成形空間）Ｓが形成されている。ここで、キャビティ型１のキャビティＳに面するキャビティ面１ａは製品の意匠面を形成するためのものである。 In the state where the cavity mold 1 and the core mold 2 are joined as shown in FIG. 1, a cavity (molding space) S matching the product shape is formed between them. Here, the cavity surface 1a facing the cavity S of the cavity mold 1 is for forming a design surface of the product.

而して、本実施の形態では、コア型２のキャビティＳに面するキャビティ面２ａの図１に示す４箇所には、図２に詳細に示すような凹部３が当該コア型２の抜き方向（図１の矢印方向）に沿って形成されている。尚、凹部３の幅と深さは共に２．０ｍｍ、傾斜は２．０°に設定されている。 Thus, in the present embodiment, the recesses 3 as shown in detail in FIG. 2 are formed in the direction in which the core mold 2 is pulled out at the four positions shown in FIG. 1 of the cavity surface 2a facing the cavity S of the core mold 2. It is formed along (the arrow direction in FIG. 1). The width and depth of the recess 3 are both set to 2.0 mm and the inclination is set to 2.0 °.

次に、以上のように構成された射出成形金型を用いて樹脂成形品を射出成形する手順を図３（ａ）〜（ｃ）に基づいて以下に説明する。 Next, a procedure for injection molding a resin molded product using the injection mold configured as described above will be described below with reference to FIGS.

図３（ａ）〜（ｃ）は本発明に係る射出成形金型を用いた射出成形手順をその工程順に示す断面図であり、樹脂成形品の射出成形に際しては、図３（ａ）に示すように接合状態にあるキャビティ型１とコア型２によって形成されたキャビティ（成形空間）Ｓ内に溶融樹脂４が不図示の成形機によって充填される。尚、このとき、溶融樹脂４はコア型２のキャビティ面２ａの図１に示す４箇所に形成された凹部３にも充填される。 3 (a) to 3 (c) are cross-sectional views showing an injection molding procedure using the injection mold according to the present invention in the order of the steps. In the injection molding of a resin molded product, FIG. 3 (a) shows. Thus, the molten resin 4 is filled in the cavity (molding space) S formed by the cavity mold 1 and the core mold 2 in the joined state by a molding machine (not shown). At this time, the molten resin 4 is also filled in the recesses 3 formed at four locations shown in FIG.

上述のようにキャビティＳに溶融樹脂４が充填されると、キャビティ型１とコア型２を水等によって冷却する。すると、キャビティＳ内の溶融樹脂４が冷却されて固化し、キャビティＳ内には所望の形状の製品（樹脂成形品）Ｗが形成される。このとき、製品Ｗのコア型２のキャビティ面２ａ側の面（反意匠面）には、コア型２のキャビティ面２ａに形成された凹部３に嵌合する凸部Ｗａが形成されている（図３（ｂ），（ｃ）参照）。このようにして製品Ｗが成形されると、図３（ｂ）に示すように、コア型２を図示矢印ａ方向（図の右方向）に抜く（離型）。すると、キャビティＳが開放され、製品Ｗはキャビティ型１から離れてコア型２と共に移動する。 As described above, when the molten resin 4 is filled in the cavity S, the cavity mold 1 and the core mold 2 are cooled with water or the like. Then, the molten resin 4 in the cavity S is cooled and solidified, and a product (resin molded product) W having a desired shape is formed in the cavity S. At this time, a convex portion Wa that fits into the concave portion 3 formed on the cavity surface 2a of the core mold 2 is formed on the surface (counter-design surface) of the core mold 2 of the product W on the cavity surface 2a side (anti-design surface). (See FIGS. 3B and 3C). When the product W is molded in this manner, the core mold 2 is pulled out in the direction of the arrow a (the right direction in the figure) as shown in FIG. Then, the cavity S is opened, and the product W moves away from the cavity mold 1 and moves together with the core mold 2.

而して、本実施の形態では、前述のようにコア型２のキャビティＳに面するキャビティ面２ａの図１に示す４箇所には、図２に詳細に示すような凹部３が形成され、この凹部３には製品Ｗのコア型２側の面（反意匠面）に突設された凸部Ｗａが嵌合し、両者の凹凸嵌合によって製品Ｗの横振れ（図３（ｂ）の矢印ｂ−ｂ’方向の振れ）が防がれるとともに、製品Ｗの変形が防がれる。この結果、製品Ｗを取り出す離型時において、製品Ｗの意匠面とキャビティ型１との擦れが防がれ、製品Ｗの外観や性能の低下が防がれて該製品Ｗには高い商品性が確保される。 Thus, in the present embodiment, as described above, the concave portions 3 as shown in detail in FIG. 2 are formed at the four locations shown in FIG. 1 of the cavity surface 2a facing the cavity S of the core mold 2, The concave portion 3 is fitted with a convex portion Wa projecting from the surface (anti-design surface) of the product W on the side of the core mold 2, and the lateral deflection of the product W (see FIG. (Vibration in the direction of arrow bb ′) is prevented, and deformation of the product W is prevented. As a result, at the time of releasing the product W, the design surface of the product W and the cavity mold 1 are prevented from rubbing, and the appearance and performance of the product W are prevented from being deteriorated. Is secured.

又、本実施の形態では、コア型２のキャビティ面２ａの４箇に凹部３を形成したため、これらの凹部３と製品Ｗの凸部Ｗａとの凹凸嵌合によって製品Ｗが保持されてその変形が防がれるとともに、離型時の製品Ｗの横振れが一層確実に防がれる。尚、コア型２のキャビティ面２ａに形成する凹部３は微小であるため、意匠のヒケやレイアウト、成形に対して何ら問題となることがない。 Further, in the present embodiment, since the recesses 3 are formed on the four cavity surfaces 2a of the core mold 2, the product W is held and deformed by the concave and convex fitting between the recesses 3 and the protrusions Wa of the product W. Is prevented, and the lateral wobbling of the product W at the time of mold release is more reliably prevented. In addition, since the recessed part 3 formed in the cavity surface 2a of the core mold 2 is very small, there is no problem with respect to design sink, layout, and molding.

そして、離型後に図３（ｃ）に示すように、コア型２に挿通する不図示のプッシュロッドによって製品Ｗを矢印ｃ方向の押すことによって、製品Ｗをコア型２から離して取り出すことができ、これによって一連の射出成形が完了する。 Then, as shown in FIG. 3 (c), the product W can be separated from the core mold 2 and taken out by pushing the product W in the direction of arrow c with a push rod (not shown) inserted through the core mold 2 after the mold release. This completes a series of injection molding.

ところで、以上の実施の形態では、コア型２のキャビティ面２ａに凹部３を形成したが、図４に示すようにコア型２のキャビティ面２ａに凸部５を形成しても良い。この場合、製品Ｗには凹部Ｗｂが形成され、この凹部Ｗｂにコア型２の凸部５が嵌合するため、両者の嵌合によって離型時の製品Ｗの横振れと変形が防がれる。又、本実施の形態では、コア型２のキャビティ面２ａの４箇所に凹部３を形成したが、凹部３や図４に示す凸部５を形成する箇所や個数は任意に設定可能である。 By the way, in the above embodiment, although the recessed part 3 was formed in the cavity surface 2a of the core type | mold 2, you may form the convex part 5 in the cavity surface 2a of the core type | mold 2 as shown in FIG. In this case, a concave portion Wb is formed in the product W, and the convex portion 5 of the core mold 2 is fitted into the concave portion Wb. . In the present embodiment, the recesses 3 are formed at four locations on the cavity surface 2a of the core mold 2. However, the locations and number of the recesses 3 and the projections 5 shown in FIG. 4 can be arbitrarily set.

１キャビティ型
１ａキャビティ型のキャビティ面
２コア型
２ａコア型のキャビティ面
３コア型の凹部
４溶融樹脂
５コア型の凸部
Ｓキャビティ
Ｗ製品
Ｗａ製品の凸部
Ｗｂ製品の凹部 DESCRIPTION OF SYMBOLS 1 Cavity type | mold 1a Cavity type | mold cavity surface 2 Core type | mold 2a Core type | mold cavity surface 3 Core type | mold recessed part 4 Molten resin 5 Core type | mold convex part S Cavity W product Wa Product convex part Wb Product concave part

Claims

固定側のキャビティ型と可動側のコア型によって形成されるキャビティに溶融原料を充填し、充填した溶融原料が冷却されて固化すると、前記コア型を抜いて製品を取り出す射出成形金型において、
前記コア型の前記キャビティに面するキャビティ面に、当該コア型の抜き方向に沿う凹部又は凸部を形成したことを特徴とする射出成形金型。 In an injection mold that fills a cavity formed by a cavity mold on the fixed side and a core mold on the movable side, and when the filled molten material is cooled and solidified, the core mold is pulled out and the product is taken out.
An injection mold, wherein a cavity surface facing the cavity of the core mold is formed with a concave portion or a convex portion along the drawing direction of the core mold.

前記凹部又は凸部を前記コア型のキャビティ面の複数箇所に形成したことを特徴とする請求項１記載の射出成形金型。
2. The injection mold according to claim 1, wherein the concave portion or the convex portion is formed at a plurality of locations on the cavity surface of the core mold.