JPH0741651B2 - Mold release method in injection molding - Google Patents
Mold release method in injection moldingInfo
- Publication number
- JPH0741651B2 JPH0741651B2 JP32136392A JP32136392A JPH0741651B2 JP H0741651 B2 JPH0741651 B2 JP H0741651B2 JP 32136392 A JP32136392 A JP 32136392A JP 32136392 A JP32136392 A JP 32136392A JP H0741651 B2 JPH0741651 B2 JP H0741651B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molded product
- hole
- movable
- insert member
- 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.)
- Expired - Fee Related
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、成形用金型を用いて熱
可塑性合成樹脂で射出成形した成形品を型開き後に、金
型から取り出す離型法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold releasing method in which a molded article injection-molded with a thermoplastic synthetic resin using a molding die is opened and then taken out from the die.
【０００２】[0002]
【従来の技術】一般に、合成樹脂製品の射出成形品で
は、成形後の製品は型開き完了後に金型から離型させる
ために、いろいろな離型手段が用いられているが、この
離型に基づく痕跡が成形製品の外観に残って体裁上不具
合が生じ、商品価値を低下させるので、痕跡をなるべく
目立たないように工夫され、改善の要求も多く出されて
いる。従来の射出成形品では、形成される貫通孔若しく
は穴または窪みは製品の離型時に離型抵抗が大きく、殊
に使われる合成樹脂材が成形時の収縮率が大きいもので
は、離型抵抗が大きいので、この付近に離型のために突
き出しピンを設置することや、製品の一部分を押すスト
リッパープレート或いはスリーブ突き出しによる離型方
式が試みられている。2. Description of the Related Art Generally, in an injection molded product of a synthetic resin product, various mold releasing means are used for releasing the molded product from the mold after completion of mold opening. Since traces based on the traces remain on the appearance of the molded product and cause a cosmetic defect and reduce the commercial value, the traces are devised so as to be inconspicuous as much as possible, and many requests for improvement have been made. In conventional injection-molded products, the through-holes, holes, or depressions that are formed have a large release resistance when the product is released from the mold, and especially when the synthetic resin material used has a large shrinkage ratio during the molding, the release resistance is large. Because of its large size, it has been attempted to install an ejector pin for releasing the mold in this vicinity, or a mold releasing method by ejecting a stripper plate or a sleeve for pushing a part of the product.
【０００３】[0003]
【発明が解決しようとする課題】ところが、いずれの方
式でも製品に備えられる貫通孔や窪みなどが円形の場合
に限られ、製品の形状に対する制約が大きいし、また離
型痕跡を製品の目立たない位置とするための外観上の制
約が多く、設計上の自由度がないし、また貫通孔成形用
の入子部材も収縮力による横方向の力が加わって抜き差
していたために、入子部材が円形または楕円形のピンの
場合、収縮力によりピンが片方に押し付けられ、ピン孔
に接触するが、ピンの外径が金型本体の孔内径より小さ
く、また加工誤差などあるので、一点での点接触となる
ことが多く、この接触点に力が集中して直ちに摩耗し、
バリが生じる悪結果となって問題があった。本発明は、
これら従来の欠点を排除し、入子部材の形状に制約され
ることなく離型痕跡を残すことなく、離型処理を著しく
簡便化して成形製品を製造することができ、成形品の外
観上の不具合もなく商品価値の高い射出成形品を生産す
ることができる有効な離型法を提供することを目的とす
るものである。However, in any of the methods, it is limited to the case where the through holes and the depressions provided in the product are circular, the shape of the product is greatly restricted, and the release traces are not conspicuous on the product. There are many restrictions on the external appearance for positioning, there is no design freedom, and the insert member for forming the through-hole was also inserted and removed by the lateral force due to the contracting force, so the insert member was circular. Or, in the case of an elliptical pin, the pin is pressed to one side due to the contracting force and contacts the pin hole, but the outer diameter of the pin is smaller than the inner diameter of the hole of the mold body, and there are processing errors, etc. It often comes into contact, the force is concentrated at this contact point and wears immediately,
There was a problem as a bad result that burr occurred. The present invention is
It is possible to eliminate these conventional defects, to leave the mold release trace without being restricted by the shape of the insert member, and to significantly simplify the mold release process to manufacture a molded product. It is an object of the present invention to provide an effective mold release method capable of producing an injection-molded article having a high commercial value without any trouble.
【０００４】[0004]
【課題を解決するための手段】本発明は、キャビティの
ある成形金型を用いて射出成形した貫通孔または窪みを
有する成形品を金型の型開き後の離型の際に、前記貫通
孔または窪みを形成するために用いられ、かつ複数に分
割された金型部材の少なくとも一つを分割面に沿って成
形品から引き抜き移動させたのち、再び所定位置に戻し
て成形品を成形金型より離型させることを特徴とする射
出成形における離型法である。SUMMARY OF THE INVENTION According to the present invention, when a molded product having a through hole or a recess formed by injection molding using a mold having a cavity is released from the mold after the mold is opened, the through hole is used. Alternatively, at least one of a plurality of mold members used for forming a recess is pulled out from the molded product along the dividing surface and moved, and then returned to a predetermined position again to mold the molded product. It is a mold releasing method in injection molding, which is characterized by further releasing the mold.
【０００５】[0005]
【作用】可動金型を摺動して固定金型に嵌合させて入子
部材を突設したキャビティ内に原料を充填冷却して成形
製品化するが、成形工程終了後に可動金型を後退させて
製品放出位置に移動させる。そして型開き完了後、また
は型開き途中で入子部材をキャビティから引き抜き製品
から一旦入子部材を外したのち、該入子部材を作動して
キャビティ内の元の位置に再び戻し、製品を突き出して
離型を一層確実に行ない、痕跡も貫通孔や窪みの中にあ
って体裁良好な外観で製品を離型することができる。[Function] The movable die is slid to fit into the fixed die, the raw material is filled and cooled in the cavity in which the insert member is projecting, and a molded product is produced, but the movable die is retracted after the molding process is completed. And move it to the product discharge position. After completion of mold opening, or during mold opening, pull out the insert member from the cavity, remove the insert member from the product, and then operate the insert member to return it to the original position in the cavity and eject the product. The mold can be released more reliably, and the traces are also present in the through holes or the dents, so that the product can be released with a good appearance.
【０００６】[0006]
【実施例】本発明を図１及び図２例で実施例を参照して
説明すると、キャビティ１０を区画形成する固定金型２
と可動金型３を用いて成形品１を射出成形したのち、キ
ャビティ１０で成形した貫通孔１１または窪みを有する
成形品１を金型の型開き後の離型の際に、前記貫通孔１
１または窪みを形成するために用いられ、かつ複数に分
割された金型部材の少なくとも一つを、即ち、入子部材
４を非入子部分５との分割面に沿って、成形品から引き
抜き移動させたのち、再び所定位置に戻して成形品１を
成形金型の可動金型３より離型させるようにしてある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment with reference to FIGS. 1 and 2 and a fixed mold 2 for defining a cavity 10 is formed.
And After injection molding of the molded article 1 with a movable mold 3, when the molded article 1 having a through-hole 1 1 or depressions molded in the cavity 10 of the release after mold opening of the mold, the through hole 1
1 or at least one of a plurality of divided mold members used for forming a recess, that is, the insert member 4 is pulled out from the molded product along a dividing surface with the non-insert portion 5. After moving, the molded product 1 is returned to the predetermined position again and the molded product 1 is released from the movable mold 3 of the molding mold.
【０００７】貫通孔１１または窪みを形成する金型部材
としては、分離面に沿う入子部材４と非入子部分５とか
らなるものであって、型開き完了後に該入子部材４を成
形品１に対して引き抜き、かつ挿入する作動で成形品１
を成形金型の可動金型３より離型するようにしてある
が、非入子部分５を可動金型３の一部ではなく別個部材
で構成することもできる。また、前記貫通孔１１の一部
を形成する入子部材４は、抜け勾配或いは、先端部から
離れた部位に段または面取りを設けたり、さらに貫通孔
１１または窪みを形成する非入子部分５は抜け勾配と逆
の勾配を有していてもよい。なお、前記入子部材４とし
ては、形成される貫通孔１１の一部または全部を可動金
型側として、該貫通孔１１を形成する部分を入子として
キャビティ１０より独立させたものを用いるのがよい。[0007] As the die member that forms the through hole 1 1 or depressions, be comprised of a nested member 4 along the separation surface non telescopic part 5 which, the該入Ko member 4 after mold opening completion Molded product 1 by pulling out and inserting into molded product 1
Although the mold is separated from the movable mold 3 of the molding mold, the non-nesting portion 5 may be formed not as a part of the movable mold 3 but as a separate member. Also, nested member 4 forming part of the through hole 1 1, draft or may be provided the site stage or beveled away from the tip, a non-nesting of further forming a through-hole 1 1 or indentation The part 5 may have a gradient opposite to the draft gradient. As the pre Kinyuko member 4, a part or all of the through-hole 1 1, which is formed as a movable mold side, those made independent from the cavity 10 a portion forming the through hole 1 1 as nesting Good to use.
【０００８】前記貫通孔１１の場合には、貫通孔１１を
形成する入子部材４の一部を可動側としてあるが、有効
な抜け勾配を持たないようにすることが考慮され、成形
後（樹脂冷却後）の型開き途中で、入子部材４をキャビ
ティ１０から引き抜き、製品から入子部材４を外し、再
び元の位置に戻すように作動させるのがよい。[0008] In the case of the through hole 1 1, although a part of the insert member 4 to form a through-hole 1 1 as the movable side is considered to be in a manner such that there is no valid draft, molding During the subsequent mold opening (after resin cooling), it is preferable to pull out the insert member 4 from the cavity 10, remove the insert member 4 from the product, and operate again to return it to the original position.
【０００９】前記成形用金型としては、図２に示すよう
に固定金型２と可動金型３との間に形成されるキャビテ
ィ１０に樹脂を充填冷却後、可動金型３が固定金型２か
ら後退するようにし、この際、冷却した樹脂の成形品１
は、可動金型３に付着したままであって、入子部材４が
型板６を貫通し、入子部材４の一端がキャビティ１０の
中に全部または一部突出して摺動できるようになってい
る。そして、成形品１の離型のためには、可動金型３を
型板６より引き離し、連結杆７を介して入子部材４の先
端をキャビティ１０内から完全に引っ込ませてから、作
動部材８で連結杆７を介して入子部材４を再び突き出
し、該入子部材４を元の位置に戻す作動をさせて成形品
１を金型３から取り出すようにする。前記固定金型２
は、金型取付盤１２に、また可動金型３は型板６及びサ
ポート９を介して金型取付盤１３に備えられ、対向する
両金型２，３間にパーティング面１１を形成してある。As the molding die, as shown in FIG. 2, the cavity 10 formed between the fixed die 2 and the movable die 3 is filled with resin and cooled, and then the movable die 3 is fixed. 2 so as to move backward, and at this time, the cooled resin molded product 1
Is attached to the movable mold 3 so that the insert member 4 can penetrate the mold plate 6 and one end of the insert member 4 can be entirely or partially projected into the cavity 10 to slide. ing. Then, in order to release the molded product 1, the movable mold 3 is separated from the mold plate 6, and the tip of the insert member 4 is completely retracted from the inside of the cavity 10 via the connecting rod 7, and then the operating member is released. In step 8, the insert member 4 is again projected through the connecting rod 7, and the insert member 4 is returned to its original position so that the molded product 1 can be taken out of the mold 3. The fixed mold 2
Is provided on the mold mounting plate 12, and the movable mold 3 is provided on the mold mounting plate 13 via the mold plate 6 and the support 9 to form a parting surface 11 between the two molds 2 and 3 facing each other. There is.
【００１０】また、前記入子部材４としては、前記成形
品１にテーパー孔を形成するようにした逆勾配を設けた
入子部材４とし、該入子部材４の再挿入の際に、製品の
貫通孔または窪みに全部入らず製品を突き出すようにし
たもので離型を一層確実化することもできる。Further, the nesting member 4 is a nesting member 4 provided with a reverse slope so that a tapered hole is formed in the molded product 1, and when the nesting member 4 is reinserted, the product The mold release can be further ensured by the product protruding without entering all the through holes or depressions.
【００１１】図３のごとく、細長く、一端に入子部材４
で形成される貫通孔または窪みを有し、他端にふくら
み、または窪み、または貫通孔を有する製品形状におい
ては、該入子部材４に逆勾配を設けなくても、十分な離
型効果を得ることができる。As shown in FIG. 3, the insert member 4 is elongated and has one end.
In a product shape having a through hole or a dent formed by the above and a bulge, a dent, or a through hole at the other end, it is possible to obtain a sufficient releasing effect without providing a reverse gradient to the nesting member 4. Obtainable.
【００１２】図３乃至図８の実施例では、貫通孔１１の
ある成形品１を成形する金型として用いられる固定金型
２と、パーティング面１１で分割される可動金型３との
間のキャビティ１０内に突設される入子部材を可動入子
部材４と固定入子部材５とで構成したもので、成形後の
収縮力は図５に示すＰ点及びＱ点で受けることとなり、
Ｐ点における収縮力は、作動する可動入子部材４から分
割面１４を介して、固定入子部材５に伝わり、可動入子
部材４が作動する時も収縮力で固定入子部材５に押し付
けられたままであるが、分割面１４が図７のように平坦
面であるため、収縮力を均一に受け、また分割面１４の
平面の加工精度も上げられるため金型の精度が上り、ガ
タが生じにくいし金型の寿命も大巾に伸ばすことができ
る。[0012] In the embodiment of FIGS. 3-8, the fixed mold 2 which is used as a mold for molding the molded article 1 with through-holes 1 1, the movable mold 3 divided by the parting plane 11 The insert member projecting in the cavity 10 between is composed of the movable insert member 4 and the fixed insert member 5, and the contracting force after molding is to be received at points P and Q shown in FIG. Next to
The contracting force at the point P is transmitted from the operating movable nesting member 4 to the fixed nesting member 5 via the dividing surface 14, and is pressed against the stationary nesting member 5 by the contracting force even when the movable nesting member 4 operates. However, since the dividing surface 14 is a flat surface as shown in FIG. 7, the contracting force is uniformly received, and the processing accuracy of the flat surface of the dividing surface 14 is improved, so that the accuracy of the mold is increased and the backlash is reduced. It is unlikely to occur and the life of the mold can be greatly extended.
【００１３】なお、図６に示すように可動入子部材４を
成形品１から引き抜いて移動させると、（図６ａ）のＰ
点とＱ点との間に作用していた収縮力により成形品は瞬
時に収縮し、入子部材４は貫通孔１１に入らなくなるの
で、エジェクトピン１５と共に可動入子部材４を押し出
せば、成形品１を可動金型３から抜き出し離型する（図
６ｂ）ことができる。即ち、成形品１の離型のために
は、可動金型３及び型板６を固定金型２から引き離し、
パーティング面１１の型開きしてから連結杆７を介し
て、可動入子部材４の先端を引っ込めた（図６ａ）の
ち、作動部材８で連結片を介して可動入子部材７を押し
戻して離型する。前記固定金型２は、金型取付盤１２
に、また可動金型３は型板６及びサポート９を介して金
型取付盤１３に備えられて互に対設され、エジェクトピ
ン１５と共に可動入子部材４が作動部材８で突没できる
ようにしてある。（図８）As shown in FIG. 6, when the movable insert member 4 is pulled out from the molded product 1 and moved, P of (FIG. 6a) is obtained.
Molded article shrinks instantaneously by contraction force operating between the point and the point Q, the insert member 4 will not enter the through-hole 1 1, it is extruded a movable insert member 4 with the eject pin 15 The molded product 1 can be extracted from the movable mold 3 and released (FIG. 6b). That is, in order to release the molded product 1, the movable mold 3 and the mold plate 6 are separated from the fixed mold 2,
After the mold of the parting surface 11 is opened, the tip of the movable insert member 4 is retracted through the connecting rod 7 (Fig. 6a), and then the movable insert member 7 is pushed back by the operating member 8 through the connecting piece. Release the mold. The fixed mold 2 is a mold mounting plate 12
In addition, the movable molds 3 are provided on the mold mounting plate 13 via the mold plate 6 and the support 9 and are installed opposite to each other, so that the movable insert member 4 together with the eject pin 15 can be projected and retracted by the actuating member 8. I am doing it. (Figure 8)
【００１４】[0014]
【発明の効果】本発明は、成形金型のキャビティ内に貫
通孔または窪みを形成するための入子部材を配置して射
出成形した成形品を型開きによって金型より離型する
際、貫通孔または窪みを形成するために用いられ、かつ
複数に分割された金型部材の少なくとも一つを分割面に
沿って成形品から引き抜き移動させたのち、再び所定位
置に戻して成形品を成形金型より離型させることによ
り、入子部材の形状に制約されることなく、また離型痕
跡を残すこともなく、離型処理を著しく簡便化して成形
製品を製造することができ、成形品の外観上の不具合も
なく商品価値の高い射出成形品を生産することができる
ほか、離型のための外観上の制約がなくなり、製品設計
上の自由度も大巾に拡大でき、大量生産にも適するなど
の実用上の効果がある。INDUSTRIAL APPLICABILITY According to the present invention, when the insert member for forming the through hole or the recess is arranged in the cavity of the molding die and the injection-molded article is released from the die by opening the die, the penetration is performed. At least one of a plurality of mold members used to form holes or depressions is pulled out from the molded product along the dividing surface, and then moved back to the predetermined position again to mold the molded product. By releasing the mold from the mold, the molded product can be manufactured by significantly simplifying the mold release process without being restricted by the shape of the insert member and without leaving a trace of the mold release. In addition to being able to produce injection-molded products with high commercial value without defects in appearance, there are no restrictions on appearance for releasing the mold, which greatly expands the degree of freedom in product design and enables mass production. Has practical effects such as suitability
【図１】本発明の実施例の一使用状態の一部の縦断面図
である。FIG. 1 is a vertical cross-sectional view showing a part of a use state of an embodiment of the present invention.
【図２】図１の例の一使用状態を示す装置組込の縦断面
図である。FIG. 2 is a vertical cross-sectional view of a device incorporated showing one usage state of the example of FIG.
【図３】本発明法で製造した成形品の平面図である。FIG. 3 is a plan view of a molded product manufactured by the method of the present invention.
【図４】図３のＡ−Ａ線における縦断面図である。4 is a vertical sectional view taken along the line AA of FIG.
【図５】図３の例の製造工程の一部縦断面図である。5 is a partial vertical cross-sectional view of the manufacturing process of the example of FIG.
【図６】図５の例の離型状態の作動説明断面図で、ａは
入子部材を成形品から移動させた状態、ｂは成形品を金
型から抜き出した伏態を示す。6A and 6B are sectional views for explaining the operation of the example of FIG. 5 in a released state, in which a shows a state in which the insert member is moved from the molded product, and b shows a state in which the molded product is extracted from the mold.
【図７】図６（ｂ）のＢ−Ｂ線における切断平面図であ
る。FIG. 7 is a sectional plan view taken along the line BB in FIG. 6 (b).
【図８】図５の例の使用状態の金型装置の縦断面図であ
る。FIG. 8 is a vertical cross-sectional view of the mold device in the use state of the example of FIG.
１ 成形品 １１貫通孔 ２ 固定金型 ３ 可動金型 ４ 入子部材 ５ 非入子部分 ６ 型板 ７ 連結杆 ８ 作動部材 ９ サポート １０ キャビティ １１ パーティング面 １２ 金型取付盤 １３ 金型外付盤 １４ 分割面 １５ エジェクトピン1 Molded Product 1 1 Through Hole 2 Fixed Die 3 Movable Die 4 Nesting Member 5 Non-Nesting Part 6 Die Plate 7 Connecting Rod 8 Actuating Member 9 Support 10 Cavity 11 Parting Surface 12 Die Mounting Plate 13 Outside Die Attached board 14 Dividing surface 15 Eject pin
Claims (2)
成形した貫通孔または窪みを有する成形品を金型の型開
き後の離型の際に、前記貫通孔または窪みを形成するた
めに用いられ、かつ複数に分割された金型部材の少なく
とも一つを分割面に沿って成形品から引き抜き移動させ
たのち、再び所定位置に戻して成形品を成形金型より離
型させることを特徴とする射出成形における離型法。1. A molded article having a through hole or a dent, which is injection-molded by using a molding die having a cavity, is used for forming the through hole or the dent when the mold is released from the mold after the mold is opened. And pulling and moving at least one of the plurality of divided mold members from the molded product along the dividing surface, and then returning it to a predetermined position to release the molded product from the mold. Molding method in injection molding.
が、分離面に沿う入子部材と非入子部分とからなるもの
であって、型開き完了後に該入子部材を成形品に対して
引き抜き、かつ挿入する作動で成形品を成形金型の可動
金型より離型する請求項１記載の射出成形における離型
法。2. A die member for forming a through hole or a depression comprises a nesting member and a non-nesting portion along a separation surface, and the nesting member is formed on a molded product after completion of mold opening. The mold releasing method in injection molding according to claim 1, wherein the molded product is released from the movable mold of the molding die by an operation of pulling out and inserting the molded article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32136392A JPH0741651B2 (en) | 1992-11-06 | 1992-11-06 | Mold release method in injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32136392A JPH0741651B2 (en) | 1992-11-06 | 1992-11-06 | Mold release method in injection molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06143368A JPH06143368A (en) | 1994-05-24 |
| JPH0741651B2 true JPH0741651B2 (en) | 1995-05-10 |
Family
ID=18131737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32136392A Expired - Fee Related JPH0741651B2 (en) | 1992-11-06 | 1992-11-06 | Mold release method in injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741651B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7661947B2 (en) * | 2005-11-21 | 2010-02-16 | Epoch Composite Products, Inc. | Method and apparatus for molding roofing products with back gating |
-
1992
- 1992-11-06 JP JP32136392A patent/JPH0741651B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06143368A (en) | 1994-05-24 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |