JPH06155532A - Mold releasing method in injection molding - Google Patents
Mold releasing method in injection moldingInfo
- Publication number
- JPH06155532A JPH06155532A JP33388292A JP33388292A JPH06155532A JP H06155532 A JPH06155532 A JP H06155532A JP 33388292 A JP33388292 A JP 33388292A JP 33388292 A JP33388292 A JP 33388292A JP H06155532 A JPH06155532 A JP H06155532A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molded product
- movable
- insert member
- hole
- 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など問題があった。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 of the position, and there are problems such as lack of freedom in design. INDUSTRIAL APPLICABILITY The present invention eliminates these conventional drawbacks, does not limit the shape of the insert member, does not leave a mold release trace, and can significantly simplify the mold release treatment to produce 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 defects in appearance.
【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る入子部材が固
定入子部材と可動入子部材とに複数に分割して設けら
れ、該可動入子部材の少なくとも一つを分割面に沿って
成形品とともに可動金型から突き出し移動させて外した
のち、再び所定位置に引き戻して成形品を可動金型に当
接し可動入子部材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, the insert member used to form the recess is divided into a fixed insert member and a movable insert member, and at least one of the movable insert members is formed along the divided surface together with the molded product. This is a mold releasing method in injection molding characterized in that it is ejected from the movable mold, removed, and then pulled back to a predetermined position to bring the molded product into contact with the movable mold and release it from the movable insert member.
【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て型開きする。そして型開き完
了後または型開き途中で可動入子部材をキャビティから
突き出し成形品を可動金型から外したのち、該可動入子
部材を作動してキャビティ内の元の位置に再び戻し、突
き出された成形品を可動金型のパーティング面に残して
可動入子部材を引き抜い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. Then, the mold is moved to the product discharge position and the mold is opened. After completion of mold opening or during mold opening, the movable insert member is ejected from the cavity, the molded product is removed from the movable mold, and then the movable insert member is actuated to return it to the original position in the cavity and ejected. The molded product is left on the parting surface of the movable mold, and the movable insert member is pulled out to perform mold release more reliably, and the trace is also in the through hole or dent, and the product is released with a good appearance. be able to.
【０００６】[0006]
【実施例】本発明を図１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１1 または
窪みを形成するために用いられる入子部材が、固定入子
部材５と可動入子部材４とに複数に分割して設けられ、
該可動入子部材４の少なくとも一つを分割面に沿って成
形品１とともに可動金型３から突き出し移動させて外し
たのち、再び所定位置に引き戻して成形品１を可動金型
３に当接し可動入子部材４より離型させ成形品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 FIG. 1. A molded product 1 is injection-molded by using a fixed mold 2 and a movable mold 3 which define a cavity 10. molded article 1 having a through-hole 1 1 or indentation molded
The upon release after mold opening of the mold, the through-hole 1 1 or depressions nesting member used to form the divides into a plurality of the fixed insert member 5 and the movable insert member 4 Is provided by
At least one of the movable insert members 4 is ejected from the movable mold 3 along with the molded product 1 along the dividing surface to be removed, and then pulled back to a predetermined position to bring the molded product 1 into contact with the movable mold 3. The movable insert member 4 is released from the mold, and the molded product 1 is released from the movable mold 3 of the molding die.
【０００７】貫通孔１1 または窪みを形成する金型部材
の入子部材としては、分離面のある可動入子部材４と固
定入子部材５とからなるものであって、型開き完了後に
該可動入子部材４を成形品１とともに突き出し引き戻す
作動で、成形品１を可動金型３より離型するようにして
あるが、固定入子部材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
を形成する可動入子部材４が、抜け勾配或いは逆勾配を
つけずに先端部から離れた部位に段または面取りを設
け、ストレートな摺動面の外周面を持ち、該外周面に平
行な分割面で固定入子部材５と複数に分離されて、キャ
ビティから突き出し方向に前進させた後に、再びもとの
位置に戻して成形品１を可動金型３より離型させるのが
よく、さらに貫通孔１1 または窪みの固定入子部材５は
抜け勾配と逆の勾配を有していてもよい。なお、前記可
動入子部材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] The insert member of the die member that forms the through hole 1 1 or depressions, be comprised of a movable insert member 4 with a separating surface fixed insert member 5 which, the after mold opening completion The movable insert member 4 is ejected and pulled back together with the molded product 1 to release the molded product 1 from the movable mold 3, but the fixed insert member 5 is not a part of the movable mold 3 but a separate member. It can also be configured with. Also, the through hole 11
The movable nesting member 4 forming the step is provided with a step or chamfer at a position away from the tip end without forming a draft or an inverse gradient, has an outer peripheral surface of a straight sliding surface, and is divided in parallel to the outer peripheral surface. It is preferable that the surface is separated into a plurality of parts from the fixed insert member 5 and is advanced from the cavity in the protruding direction, and then returned to the original position to release the molded product 1 from the movable mold 3 and further penetrates. fixed insert member bore 1 1 or depressions 5 may have a gradient of slope opposite dropout. Incidentally, as the movable insert member 4, a part or all of the through-hole 1 1, which is formed as a movable mold side, used after made independent from the cavity 10 a portion forming the through hole as a nesting Is good.
【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から突き出し、再び元の位置に戻すように作動させ
てもよい。[0008] In the case of the through hole 1 1, although a part of the insert member forming a through-hole 1 1 as the movable side is considered to be in a manner such that there is no valid draft, after molding The insert member 4 may be projected from the cavity 10 during mold opening (after resin cooling) and may be operated so as to return 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、可動入子部材
４の根本が型板６に取付けられ、可動入子部材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
には連結杆７を介して可動入子部材４を作動部材８で突
き出し、該可動入子部材４を元の位置に戻す作動をさせ
て成形品１を金型から取り出すようにする。即ち、図３
に示すように、可動金型３が固定金型２から後退して型
開き（図３ａ）すると、型開き直後の成形品１は上面側
が離型された状態（図３ｂ）となってから、可動入子部
材４を前進させると、成形品１もそれに従って移動し、
可動金型３及び固定入子部材５から外れ、突き出され
る。そして成形品１は瞬時に収縮が進み、貫通孔１1 も
小さくなる（図３ｃ）。次で可動入子部材４を元の位置
に戻す引き込み作動をすると、成形品１は可動金型３に
当接するが、成形品１の貫通孔１1 または窪みは元の凹
部に入らないで成形品１は固定入子部材５に引掛り、成
形品を可動金型３上に残した状態（図３ｄ）で可動入子
部材４が成形品１より引き抜かれることとなる（図３
ｅ）。この場合固定入子部材５の高さが、成形品１の離
型のストロークとして作用することと離型サイクルを最
小で効率的に行うことができる。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. Molded product 1 made of resin cooled so as to retract from 2
Is attached to the movable mold 3, the base of the movable insert member 4 is attached to the mold plate 6, and one end of the movable insert member 4 slides into the cavity 10 in whole or in part. You can do it. Then, in order to release the molded product 1, the movable insert member 4 is projected by the actuating member 8 through the connecting rod 7, and the movable insert member 4 is operated to return to its original position to form the molded product 1. Take it out of the mold. That is, FIG.
As shown in Fig. 3, when the movable mold 3 is retracted from the fixed mold 2 and the mold is opened (Fig. 3a), the upper surface side of the molded product 1 immediately after mold opening is released (Fig. 3b). When the movable insert member 4 is moved forward, the molded product 1 also moves accordingly,
It is detached from the movable mold 3 and the fixed insert member 5 and is ejected. Then, the molded product 1 instantly shrinks, and the through hole 11 also becomes smaller (FIG. 3c). Next, when the retracting operation of returning the movable insert member 4 to the original position is performed, the molded product 1 contacts the movable mold 3, but the through hole 11 or the recess of the molded product 1 does not enter the original recessed part. The product 1 is caught by the fixed insert member 5, and the movable insert member 4 is pulled out from the molded product 1 in the state where the molded product is left on the movable mold 3 (FIG. 3d) (FIG. 3).
e). In this case, the height of the fixed insert member 5 acts as a mold release stroke of the molded product 1 and the mold release cycle can be performed with minimum efficiency. The fixed mold 2 is on the mold mounting plate 12, and the movable mold 3 is the mold plate 6 and the support 9.
It is provided on the mold mounting board 13 via the, and a parting surface 11 is formed between the two molds 2 and 3 facing each other.
【００１０】図４の例では、前記成形品１にテーパー貫
通孔１1 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、成形品の貫通孔
または窪みに全部入らず成形品を突き出すようにしたも
ので離型を一層確実化できる。[0010] In the example of FIG. 4, the as-molded article 1 insert member 4 having a reverse gradient so as to form a tapered through-hole 1 1, during the reinsertion of該入Ko member 4, the molded article The mold release can be further ensured by the projection of the molded product without entering all the through holes or depressions.
【００１１】なお、前記入子部材４が、成形品１から引
き抜かれると、製品は瞬時に収縮が進み、貫通孔１1 ま
たは窪みの内径寸法が入子部材４の外周寸法より小さく
なることを利用して引き抜き作動の際の抵抗としてもよ
いが、図３ｅ例のように積極的に入子部材４を引き抜い
た後は、貫通孔１1 または窪みに入らないように考慮す
ることも入子部材４の形状によって選べる。これらの場
合、貫通孔１1 の可動金型３側部分或いは窪みの深さ
が、成形品１の離型時のストロークとして作用するよう
に配慮するのがよい。また、貫通孔１1 の固定入子部材
５を抜け勾配と逆の勾配を設けてあるが、成形品１の可
動部分の深さより貫通孔１1 の固定入子部材５の長さを
大きくすることにより成形品１をキャビティ１０から離
型しやすくすることが配慮される。貫通孔１1 の可動側
部分に逆勾配を設けずにストレートでも収縮により離型
させることもできる。It should be noted that when the insert member 4 is pulled out from the molded product 1, the product shrinks instantly, and the inner diameter of the through hole 11 or the recess becomes smaller than the outer peripheral size of the insert member 4. Although it may be used as a resistance at the time of pulling out, it is also possible to consider so as not to enter into the through hole 11 or the recess after positively pulling out the nesting member 4 as in the example of FIG. 3e. It can be selected depending on the shape of the member 4. In these cases, the movable die 3 side portion or recess of the depth of the through hole 1 1, it is preferable to consider to act as a stroke during the release of the molded product 1. Further, although the fixed insert member 5 of the through hole 1 1 is provided with a gradient opposite to the slope, the length of the fixed insert member 5 of the through hole 1 1 is made larger than the depth of the movable portion of the molded product 1. This makes it easier to release the molded product 1 from the cavity 10. May also be release by the contraction straight without providing a reverse slope to the movable portion of the through-hole 1 1.
【００１２】[0012]
【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る入子
部材が固定入子部材と可動入子部材とに複数に分割して
設けられ、該可動入子部材の少なくとも一つを分割面に
沿って成形品とともに、可動金型から突き出し移動させ
て外したのち、再び所定位置に引き戻して成形品を可動
金型に当接し可動入子部材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. An insert member used to form a hole or a recess is provided in a plurality of divided parts in a fixed insert member and a movable insert member, and at least one of the movable insert members is formed along a dividing surface. At the same time, by ejecting it from the movable mold and removing it, it is pulled back to a predetermined position and the molded product is brought into contact with the movable mold and released from the movable insert member.
Molded products can be manufactured without being restricted by the shape of the insert member and leaving a mold release trace, and mold release processing can be significantly simplified. In addition to being able to produce molded products, there are no restrictions on the appearance for mold release, the degree of freedom in product design can be greatly expanded, and there are practical effects such as being suitable for mass production.
【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】図１の例の離型工程の作動状態の一部の縦断面
図である。FIG. 3 is a vertical cross-sectional view of a part of the operating state of the mold releasing process of the example of FIG.
【図４】本発明法で製造した成形品の平面図である。FIG. 4 is a plan view of a molded product manufactured by the method of the present invention.
【図５】ａは図４のＡ−Ａ線における縦断面図、ｂは図
４のＢ−Ｂ線における縦断面図、ｃは図４のＣ−Ｃ線に
おける縦断面図である。5A is a vertical sectional view taken along line AA of FIG. 4, b is a vertical sectional view taken along line BB of FIG. 4, and c is a vertical sectional view taken along line CC of FIG.
１ 成形品 １1 貫通孔 ２ 固定金型 ３ 可動金型 ４ 可動入子部材 ５ 固定入子部材 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1 Molded product 1 1 Through hole 2 Fixed mold 3 Movable mold 4 Movable insert member 5 Fixed insert member 6 Mold plate 7 Connecting rod 8 Actuating member 9 Support 10 Cavity 11 Parting surface 12 Mold mounting board 13 Mold External board
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
めに用いられる入子部材が固定入子部材と可動入子部材
とに複数に分割して設けられ、該可動入子部材の少なく
とも一つを分割面に沿って成形品とともに可動金型から
突き出し移動させて外したのち、再び所定位置に引き戻
して成形品を可動金型に当接し可動入子部材より離型さ
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. The insert member is divided into a fixed insert member and a movable insert member, and at least one of the movable insert members is moved along the dividing surface by protruding from the movable mold together with the molded product. A mold releasing method in injection molding, characterized in that after removing, the molded product is pulled back to a predetermined position and a molded product is brought into contact with a movable mold and released from a movable insert member.
ストレートな摺動面の外周面を持ち、該外周面に平行な
分割面で固定入子部材と複数に分離されてキャビティか
ら突き出し方向に前進させた後に、再びもとの位置に戻
して成形品を金型より離型させる請求項１記載の射出成
形における離型法。2. A movable nesting member forming the through hole,
A molded product that has an outer peripheral surface of a straight sliding surface, is separated into a plurality of fixed insert members by a dividing surface parallel to the outer peripheral surface, and advances in the protruding direction from the cavity, and then returns to the original position again. The mold releasing method in injection molding according to claim 1, wherein the mold is released from the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33388292A JPH0694149B2 (en) | 1992-11-20 | 1992-11-20 | Mold release method in injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33388292A JPH0694149B2 (en) | 1992-11-20 | 1992-11-20 | Mold release method in injection molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06155532A true JPH06155532A (en) | 1994-06-03 |
| JPH0694149B2 JPH0694149B2 (en) | 1994-11-24 |
Family
ID=18271011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33388292A Expired - Fee Related JPH0694149B2 (en) | 1992-11-20 | 1992-11-20 | Mold release method in injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0694149B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179316A (en) * | 2021-12-11 | 2022-03-15 | 湖南创益鑫科技有限公司 | Navel orange plastic basket processing equipment |
-
1992
- 1992-11-20 JP JP33388292A patent/JPH0694149B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179316A (en) * | 2021-12-11 | 2022-03-15 | 湖南创益鑫科技有限公司 | Navel orange plastic basket processing equipment |
| CN114179316B (en) * | 2021-12-11 | 2023-12-19 | 湖南创益鑫科技有限公司 | Navel orange plastic basket processing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0694149B2 (en) | 1994-11-24 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |