JPH06114904A - Injection mold and molded form using the same - Google Patents
Injection mold and molded form using the sameInfo
- Publication number
- JPH06114904A JPH06114904A JP29075692A JP29075692A JPH06114904A JP H06114904 A JPH06114904 A JP H06114904A JP 29075692 A JP29075692 A JP 29075692A JP 29075692 A JP29075692 A JP 29075692A JP H06114904 A JPH06114904 A JP H06114904A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- pin
- boss
- hole
- molded body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、成形品の厚肉部を形成
するボス部等を効率的に冷却することのできる射出成形
型、及び、この型から成形される芯材を用いた成形体に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die capable of efficiently cooling a boss portion or the like forming a thick portion of a molded article, and a molding using a core material molded from this die. Regarding the body
【０００２】[0002]
【従来の技術】上記の、ボス部等の冷却手段を備えた射
出成形型は、例えば実開昭６１ー１２７１４号公報に開
示されている。この技術は図４に示すように、可動型１
０１のキャビティ１０２に面する側に熱伝導性の高い素
材で作製したボス穴形成鋳抜きピン１０３を設け（ボス
穴形成鋳抜きピン１０３はパイプ１０４をかしめること
によって固定する）たものであり、成形体の冷却不良を
原因とするボス部１０５の底面１０５ａ近傍の引け（凹
み）発生を防止しようとしたものである。2. Description of the Related Art An injection molding die having a cooling means such as a boss is disclosed in, for example, Japanese Utility Model Laid-Open No. 61-12714. This technique, as shown in FIG.
01 is provided with a boss hole forming cast pin 103 made of a material having high heat conductivity on the side facing the cavity 102 (the boss hole forming cast pin 103 is fixed by caulking the pipe 104). The purpose is to prevent the occurrence of shrinkage (dent) near the bottom surface 105a of the boss portion 105 due to poor cooling of the molded body.
【０００３】[0003]
【発明が解決しようとする課題】上記公報の技術は、ボ
ス部が比較的短い場合には有効であるが、長いボス部を
擁する成形品の場合にはやはり長い冷却時間が必要であ
り、冷却が不十分のまま型を開いてしまうと、ボス部の
肉厚部が成形体から千切れて不良品となるトラブルが発
生していた。The technique of the above publication is effective when the boss portion is relatively short, but it also requires a long cooling time in the case of a molded product having a long boss portion. If the mold is opened with insufficient pressure, the thick part of the boss part is cut off from the molded product, resulting in a defect.
【０００４】本発明は、従来の技術が有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、肉厚のボス部の冷却を効率良く行うことのでき
る射出成形型を提供し、更に、この型から成形した芯材
を使用した成形体をも提供しようとするものである。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an injection molding die capable of efficiently cooling a thick boss portion. The present invention also provides a molded body using a core material molded from this mold.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決すべく本
発明の射出成形型は、キャビティを構成する例えば可動
型及び固定型の組み合わせ等の一対の型の一方に、ボス
穴部を形成するためのボス穴形成鋳抜きピンを通常複数
個設けた射出成形型を用いるものであり、他方の型にボ
ス部冷却用の冷却鋳抜きピンを設けた。上記ボス穴形成
鋳抜きピン及び冷却鋳抜きピンは熱伝導性の高い材質で
作製する。In order to solve the above-mentioned problems, the injection mold of the present invention has a boss hole formed in one of a pair of molds, such as a combination of a movable mold and a fixed mold, which constitutes a cavity. For this purpose, an injection molding die having a plurality of boss hole forming casting pins is usually provided, and a cooling casting pin for cooling the boss portion is provided on the other die. The boss hole forming casting pin and the cooling casting pin are made of a material having high thermal conductivity.
【０００６】また、本発明の成形体は、上記の射出成形
型を用いて成形した芯材へ、表皮層を貼着したものであ
り、前記冷却鋳抜きピンによって穿設された穴部には該
穴部と外部とをつなぐ通気孔を設ける。ここで前記表皮
層はソリッドの表皮のみでなく、ソリッドに発泡層が積
層されたものを包含する。Further, the molded product of the present invention is obtained by sticking a skin layer onto a core material molded by using the above-mentioned injection molding die, and the hole formed by the cooling casting pin has a hole. A vent is provided to connect the hole and the outside. Here, the skin layer includes not only a solid skin, but also a solid in which a foam layer is laminated.
【０００７】更に、本発明の他の成形体は、上記芯材
に、発泡層及び表皮層を積層した構造を有するものであ
り、前記冷却鋳抜きピンの先端を間隙を持って前記ボス
穴形成鋳抜きピンの先端に対抗させることにより、前記
冷却鋳抜きピンによって穿設された穴部を該発泡層との
み連通させる。Further, another molded body of the present invention has a structure in which a foam layer and a skin layer are laminated on the core material, and the boss hole is formed with the tip of the cooling casting pin having a gap. By facing the tip of the casting pin, the hole formed by the cooling casting pin communicates only with the foam layer.
【０００８】[0008]
【作用】本発明の射出成形型は、熱伝導性の良好なボス
穴形成鋳抜きピン及び冷却鋳抜きピンを設けたため、ボ
ス部を両側から冷却することができる。また本発明の成
形体は、上記冷却鋳抜きピンによって形成された穴部と
外部とをつなぐ通気孔を設けた芯材を用いて、これに表
皮層を貼着する。従って、上記穴部に空気が閉じ込めら
れることがないため、温度の変化によって表皮層を持上
げたり凹ませたりすることがない。Since the injection mold of the present invention is provided with the boss hole forming casting pin and the cooling casting pin having good thermal conductivity, the boss portion can be cooled from both sides. In addition, the molded body of the present invention uses a core material provided with a vent hole that connects the hole formed by the cooling casting pin and the outside, and a skin layer is attached thereto. Therefore, air is not trapped in the holes, so that the skin layer is not lifted or dented due to changes in temperature.
【０００９】また、表皮と成形体を型内にセットして、
この間に発泡剤を注入して一体化する場合には、前記冷
却鋳抜きピンの先端が間隙を持って上記ボス穴形成鋳抜
きピンの先端に対抗するように調整し、冷却鋳抜きピン
によって形成される穴部を発泡層とのみ連通させること
によって発泡剤の洩れを防止することができる。Also, the skin and the molded body are set in a mold,
When a foaming agent is injected and integrated during this period, the tip of the cooling die pin is adjusted so as to oppose the tip of the boss hole forming die pin with a gap, and is formed by the cooling die pin. It is possible to prevent the foaming agent from leaking by allowing the formed hole to communicate only with the foam layer.
【００１０】[0010]
【実施例】以下に本発明の実施例を図に基づいて説明す
る。ここにおいて図１は本発明の射出成形型の一例を示
す部分断面図である。Embodiments of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a partial sectional view showing an example of the injection molding die of the present invention.
【００１１】同図において、可動型１のキャビティ２に
面する側に、熱伝導性の高い素材で作製したボス穴形成
鋳抜きピン３を設けてパイプ４でかしめて固定する。射
出成形型自身に冷却手段（図示せず）が設けられている
ため、通常ボス穴形成鋳抜きピン３のための冷却手段を
新たに設ける必要はないが、場合によってはボス穴形成
鋳抜きピン底部３ａに直接の冷却手段を設けてもよい。
また固定型６の側には同じく熱伝導性の高い素材で作製
した冷却鋳抜きピン７を設ける。冷却鋳抜きピン７を設
けるには、このピンの径に合わせた穴を固定型６に穿設
してピンを打込んで固定するか、又は、ボス穴形成鋳抜
きピン３と同じく大きめの穴を穿設してピンを入れ、パ
イプでかしめて固定する。この冷却鋳抜きピン７の底部
７ａにも、前記のように射出成形型自身に冷却手段が設
けられているため、本来新たな冷却手段を設ける必要は
ないが、場合によっては直接の冷却手段を設けてもよ
い。In the figure, a boss hole forming cast pin 3 made of a material having high heat conductivity is provided on the side of the movable die 1 facing the cavity 2 and fixed by caulking with a pipe 4. Since the injection molding die itself is provided with cooling means (not shown), it is not usually necessary to newly provide cooling means for the boss hole forming casting pin 3, but in some cases, the boss hole forming casting pin is not provided. You may provide a cooling means directly in the bottom part 3a.
Further, on the side of the fixed mold 6, a cooling casting pin 7 which is also made of a material having high thermal conductivity is provided. In order to provide the cooling casting pin 7, a hole corresponding to the diameter of this pin is formed in the fixed mold 6 and the pin is driven in to be fixed, or a hole as large as the boss hole forming casting pin 3 is provided. Make a hole, insert a pin, and caulk with a pipe to fix. Since the cooling means is also provided in the injection mold itself at the bottom portion 7a of the cooling casting pin 7 as described above, it is not necessary to provide new cooling means, but in some cases, a direct cooling means may be provided. It may be provided.
【００１２】本発明に係る射出成形型を用いて成形体を
作製するには、図示しないシリンダー内で加熱溶融した
可塑化原料（例えばポリプロピレン）を、プランジャー
でキャビティ２内に射出し、一定時間後に冷却・硬化し
た製品を離型する。ボス部５はボス穴形成鋳抜きピン３
及び冷却鋳抜きピン７によって両側から効率よく冷却さ
れるため、上記離型時に冷却不十分による千切れを生じ
ることがない。In order to produce a molded article using the injection mold according to the present invention, a plasticizing raw material (for example, polypropylene) heated and melted in a cylinder (not shown) is injected into the cavity 2 with a plunger and kept for a certain time. After cooling, the cured product is released. The boss portion 5 is a boss hole forming cast pin 3
Also, since the cooling casting pin 7 efficiently cools from both sides, tearing due to insufficient cooling does not occur at the time of mold release.
【００１３】次に本発明に係る成形体の例について述べ
る。図２は本発明の成形体の一例を示す部分断面図
（ａ）及び芯材９に設けたボス部５の部分斜視図（ｂ）
である。同図（ａ）において成形体８は、前記射出成形
型によって作製した例えばポリプロピレン製の芯材９上
に、塩化ビニル製の表皮１０を貼着して形成されるもの
である。このような成形体８は、例えば自動車のインス
ツルメントパネルとして用いるのに好適である。同図
（ａ）及び（ｂ）に示すように、芯材９には冷却鋳抜き
ピン７によって穿設された穴部１１と、外部とをつなぐ
通気孔１２が設けてある。この通気孔１２は、例えば冷
却鋳抜きピン７にキャビティ２の厚さと等しい幅の羽根
部を取り付け、芯材９の成形と同時に成形する等の方法
によって設けることができる。通気孔１２を芯材９に設
けておけば、表皮１０を貼着する際に穴部１１に空気を
閉じ込めることがないため、表皮１０の膨れを防止する
ことができる。Next, an example of the molded article according to the present invention will be described. FIG. 2 is a partial cross-sectional view (a) showing an example of the molded body of the present invention and a partial perspective view (b) of the boss portion 5 provided on the core material 9.
Is. In the figure (a), the molded body 8 is formed by adhering a vinyl chloride skin 10 to a core material 9 made of, for example, polypropylene made by the injection molding die. Such a molded body 8 is suitable for use as an instrument panel of an automobile, for example. As shown in FIGS. 2A and 2B, the core material 9 is provided with a hole 11 formed by the cooling die pin 7 and a vent hole 12 connecting the outside. The vent holes 12 can be provided by, for example, a method of attaching a vane portion having a width equal to the thickness of the cavity 2 to the cooling die pin 7 and molding the core material 9 at the same time. If the vent hole 12 is provided in the core material 9, air is not trapped in the hole portion 11 when the skin 10 is attached, so that the skin 10 can be prevented from swelling.
【００１４】図３は本発明に係る成形体の他の例を示す
部分断面図である。この成形体１３は前記射出成形型に
よって作製した例えばポリプロピレン製の芯材９上に、
ウレタンフォーム等の発泡層１４を形成し、更にこの上
に塩化ビニル製の表皮１０を積層した構造を有するもの
である。この成形体１３も上記成形体８と同じく、例え
ば自動車のインスツルメントパネルに用いるに好適であ
る。FIG. 3 is a partial sectional view showing another example of the molded body according to the present invention. This molded body 13 is formed on the core material 9 made of polypropylene, for example, by the injection molding die,
It has a structure in which a foam layer 14 such as urethane foam is formed, and a vinyl chloride skin 10 is further laminated thereon. Like the above-mentioned molded body 8, this molded body 13 is also suitable for use in, for example, an instrument panel of an automobile.
【００１５】上記成形体１３を形成する一例を説明する
と、先ず前記射出成形型によって芯材９を形成し、次に
図３に示すように、この芯材９を可動型１上に残したま
ま表皮１０をセットした固定型１５を合わせる。そして
芯材９と表皮１０との間にできた空隙内（冷却鋳抜きピ
ン７によって穿設された穴部１１も含む）にウレタン発
泡液を注入して発泡層１４を形成する。An example of forming the molded body 13 will be described. First, the core material 9 is formed by the injection molding die, and then, as shown in FIG. 3, the core material 9 is left on the movable die 1. The fixed mold 15 on which the epidermis 10 is set is fitted. Then, the urethane foaming liquid is injected into the space formed between the core material 9 and the skin 10 (including the hole portion 11 formed by the cooling die pin 7) to form the foaming layer 14.
【００１６】[0016]
【発明の効果】以上説明したように本発明の射出成形型
によれば、熱伝導性の良好なボス穴形成鋳抜きピン及び
冷却鋳抜きピンによって肉厚のボス部を両側から効率よ
く冷却するため、離型時に冷却不十分による千切れを生
じることがない。また成形体においては、上記冷却鋳抜
きピンによって形成された穴部と外部とをつなぐ通気孔
を設けた芯材を用いて、これに表皮層を貼着して成形体
とするため、上記穴部に空気が閉じ込められることがな
い。従って、温度の変化によって表皮層が持上がったり
凹んだりすることがない。As described above, according to the injection molding die of the present invention, the thick boss portion is efficiently cooled from both sides by the boss hole forming casting pin and the cooling casting pin having good thermal conductivity. Therefore, tearing does not occur due to insufficient cooling during mold release. Further, in the molded body, using a core material provided with a vent hole that connects the hole formed by the cooling casting pin and the outside, a skin layer is adhered to the core material to form a molded body. No air is trapped in the part. Therefore, the skin layer does not rise or dent due to changes in temperature.
【００１７】また、表皮と成形体を型内にセットして、
この間に発泡剤を注入して一体化する場合には、前記冷
却鋳抜きピンの先端が間隙を持って上記ボス穴形成鋳抜
きピンの先端に対抗するように調整し、冷却鋳抜きピン
によって形成される穴部を発泡層とのみ連通させること
によって発泡剤の洩れを防止することができる。Further, the skin and the molded body are set in a mold,
When the foaming agent is injected and integrated during this period, the tip of the cooling die pin is adjusted so as to face the tip of the boss hole forming die pin with a gap, and is formed by the cooling die pin. It is possible to prevent the foaming agent from leaking by allowing the formed hole to communicate only with the foam layer.
【図１】本発明の射出成形型の一例を示す部分断面図FIG. 1 is a partial sectional view showing an example of an injection mold of the present invention.
【図２】同、成形体の一例を示す部分断面図（ａ）及び
芯材に設けたボス部の部分斜視図（ｂ）FIG. 2 is a partial cross-sectional view (a) showing an example of the molded body and a partial perspective view (b) of a boss portion provided on the core material.
【図３】同、成形体の他の例を示す部分断面図FIG. 3 is a partial cross-sectional view showing another example of the molded body.
【図４】従来の射出成形型の例を示す部分断面図FIG. 4 is a partial sectional view showing an example of a conventional injection mold.
１…可動型、２…キャビティ、３…ボス穴形成鋳抜きピ
ン、５…ボス部、６、１５…固定型、７…冷却鋳抜きピ
ン、８、１３…成形体、９…芯材、１０…表皮、１１…
穴部、１２…通気孔、１４…発泡層。DESCRIPTION OF SYMBOLS 1 ... Movable type, 2 ... Cavity, 3 ... Boss hole formation casting pin, 5 ... Boss part, 6, 15 ... Fixed type, 7 ... Cooling casting pin, 8, 13 ... Molded body, 9 ... Core material, 10 ... skin, 11 ...
Holes, 12 ... Vents, 14 ... Foam layer.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 33/76 8823−4Ｆ 45/26 7179−4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location B29C 33/76 8823-4F 45/26 7179-4F
Claims (3)
ボス穴形成鋳抜きピンを設けた射出成形型において、前
記一対の型の他方にはボス部冷却用の冷却鋳抜きピンが
設けられ、これらボス穴形成鋳抜きピン及び冷却鋳抜き
ピンは熱伝導性の高い材質で作製されていることを特徴
とする射出成形型。1. An injection molding die in which one of a pair of dies for forming a cavity is provided with a boss hole forming casting pin, and the other of the pair of dies is provided with a cooling casting pin for cooling a boss portion, The boss hole forming casting pin and the cooling casting pin are made of a material having high thermal conductivity, which is an injection molding die.
形した芯材の一面に、表皮層を貼着してなる成形体にお
いて、前記冷却鋳抜きピンによって穿設された穴部には
該穴部と外部とをつなぐ通気孔が設けられていることを
特徴とする成形体。2. A molded body obtained by adhering a skin layer on one surface of a core material molded by using the injection molding die according to claim 1, in a hole formed by the cooling die pin. Is a molded body characterized by having a vent hole connecting the hole and the outside.
形した芯材の一面に、発泡層及び表皮層を積層した成形
体において、前記冷却鋳抜きピンの先端は間隙を持って
前記ボス穴形成鋳抜きピンの先端に対抗することによ
り、前記冷却鋳抜きピンによって穿設された穴部が該発
泡層とのみ連通することを特徴とする成形体。3. In a molded body in which a foam layer and a skin layer are laminated on one surface of a core material molded by using the injection molding die according to claim 1, the tip of the cooling die pin has a gap. A molded product, characterized in that the hole portion formed by the cooling casting pin communicates only with the foam layer by facing the tip of the boss hole forming casting pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29075692A JP2669488B2 (en) | 1992-10-05 | 1992-10-05 | Injection mold and molded body using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29075692A JP2669488B2 (en) | 1992-10-05 | 1992-10-05 | Injection mold and molded body using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06114904A true JPH06114904A (en) | 1994-04-26 |
| JP2669488B2 JP2669488B2 (en) | 1997-10-27 |
Family
ID=17760130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29075692A Expired - Fee Related JP2669488B2 (en) | 1992-10-05 | 1992-10-05 | Injection mold and molded body using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2669488B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008049711A (en) * | 2007-11-06 | 2008-03-06 | Mitsubishi Electric Corp | Molding die and manufacturing process of through-holed molded article |
| JP2010082843A (en) * | 2008-09-29 | 2010-04-15 | Tokai Chem Ind Ltd | Method for manufacturing resin foam molded article and resin foam molded article |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5060458B2 (en) | 2008-12-05 | 2012-10-31 | トヨタ自動車株式会社 | Die-cast mold and die-cast method |
-
1992
- 1992-10-05 JP JP29075692A patent/JP2669488B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008049711A (en) * | 2007-11-06 | 2008-03-06 | Mitsubishi Electric Corp | Molding die and manufacturing process of through-holed molded article |
| JP4600461B2 (en) * | 2007-11-06 | 2010-12-15 | 三菱電機株式会社 | Manufacturing method of molded products |
| JP2010082843A (en) * | 2008-09-29 | 2010-04-15 | Tokai Chem Ind Ltd | Method for manufacturing resin foam molded article and resin foam molded article |
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