JP5741877B1 - Mold for resin molding - Google Patents
Mold for resin molding Download PDFInfo
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- JP5741877B1 JP5741877B1 JP2014153378A JP2014153378A JP5741877B1 JP 5741877 B1 JP5741877 B1 JP 5741877B1 JP 2014153378 A JP2014153378 A JP 2014153378A JP 2014153378 A JP2014153378 A JP 2014153378A JP 5741877 B1 JP5741877 B1 JP 5741877B1
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Abstract
【課題】一般樹脂成型品において樹脂材料の流動性に優れ、離型性がよく、金型寿命の向上に有効であり、製品形状にアンダーカット部を有する成型品の無理抜き金型にも適用が可能な樹脂成型金型の提供を目的とする。【解決手段】樹脂成型用の金型であって、金型のキャビティ又は機能面の表面は表面粗さＲａにて２０ｎｍ〜８００ｎｍの微小凹凸面に形成してあることを特徴とする。【選択図】 図１[PROBLEMS] To provide excellent resin material fluidity, good releasability, and effective in improving mold life in general resin molded products, and also applicable to molds for forging molded products having undercut parts in the product shape. It aims at providing the resin mold which can be used. A mold for resin molding is characterized in that the surface of a cavity or a functional surface of the mold is formed as a minute uneven surface with a surface roughness Ra of 20 nm to 800 nm. [Selection] Figure 1
Description
本発明は、樹脂材料を用いて射出成型，圧縮成型，トランスアー成型等の成型に用いられる金型に関し、特に樹脂成型品の成型性，離型性及び金型寿命の向上に有効な金型に係る。 The present invention relates to a mold used for molding such as injection molding, compression molding, transformer molding, etc. using a resin material. Concerning.
樹脂成型用の金型において樹脂の流動性，離型性は、樹脂成型品の外観品質に大きな影響を与えるとともに、成型サイクルにも与える影響が大きい。
また、ネジ付キャップ等の成型においては、ネジ部やタンパーエビデントバンド等の凸部を有する部分がアンダーカット形状部となり、離型のための工夫が必要となる。
現在、ネジ付キャップ用の樹脂材料としては、比較的高硬度のホモポリプロピレン樹脂，中程度の硬度からなるランダムポリプロピレン樹脂，軟質系のポリエチレン樹脂が採用されている。
これに対して、金型構造としてネジ部等を成型するコア型から樹脂成型品を離型する際に、型開きに合せてコア型をギヤモーター等にて回転させる回転抜き金型が用いられている。
このような回転抜き金型は、コア型を回転させながら、ゆっくり型開き動作を行う必要があるために成型サイクルタイムが長くなる問題がある。
また、射出成型等においては、コア型を冷却しなければならないが、コア型が回転するために冷却水路の確保が難しく、設計自由度が小さい課題もあった。
そこで、ポリエチレン樹脂等の軟質系の樹脂材料の場合に成型品をコア型から無理やり離す無理抜き動作を行っている場合もあるが、ネジ形状が変形しやすい。
特許文献１には、ネジ山数やその形状に工夫をこらした無理抜き金型構造を開示する。
しかし、同技術にあっては、樹脂成型品の形状が限定されるという重大な課題がある。
特許文献２には、無理抜きのためのストリッパーにキャップのスカート部分の拘束を減らすための切欠部を形成した無理抜き金型構造を開示する。
しかし、この場合にも樹脂成型品の形状により制限が生じるものである。
In the mold for resin molding, the fluidity and releasability of the resin have a great influence on the appearance quality of the resin molded product and also have a great influence on the molding cycle.
Further, in the molding of a threaded cap or the like, a portion having a convex portion such as a screw portion or a tamper evidence band becomes an undercut shape portion, and a device for releasing is necessary.
At present, as a resin material for a cap with a screw, a relatively high homopolypropylene resin, a random polypropylene resin having a medium hardness, and a soft polyethylene resin are employed.
On the other hand, when a resin molded product is released from a core mold that molds a screw part or the like as a mold structure, a rotary die that rotates the core mold with a gear motor or the like according to the mold opening is used. ing.
Such a rotational punching mold has a problem that the molding cycle time becomes long because it is necessary to perform the mold opening operation slowly while rotating the core mold.
In injection molding or the like, the core mold must be cooled. However, since the core mold rotates, it is difficult to secure a cooling water channel, and there is a problem that design flexibility is small.
Therefore, in the case of a soft resin material such as polyethylene resin, there is a case where a forced removal operation is performed forcibly separating the molded product from the core mold, but the screw shape is easily deformed.
Patent Document 1 discloses a forced die structure that has been devised in terms of the number of threads and its shape.
However, this technique has a serious problem that the shape of the resin molded product is limited.
Patent Document 2 discloses a forcible punching die structure in which a notch for reducing restraint of a cap skirt portion is formed on a stripper for forcibly punching.
However, in this case as well, there are limitations due to the shape of the resin molded product.
本発明は、一般樹脂成型品において樹脂材料の流動性に優れ、離型性がよく、金型寿命の向上に有効であり、製品形状にアンダーカット部を有する成型品の無理抜き金型にも適用が可能な樹脂成型金型の提供を目的とする。
また、金型のスライド部のスライド性向上、ガス逃がし部のガス抜き性向上も目的とする。
The present invention is excellent in fluidity of resin material in general resin molded products, has good releasability, is effective in improving the life of the mold, and is also used in a forced die of molded products having an undercut part in the product shape. The purpose is to provide an applicable resin mold.
Another object is to improve the slidability of the slide part of the mold and to improve the degassing property of the gas escape part.
本発明は、内側にネジ部を有するキャップを成型するための金型であって、前記金型はアンダーカット形状となるネジ部を有するキャップの内側形状を成型するためのコア型と、キャップの外側形状を成型するための外型とを有し、前記コア型はベース型から突設してあるとともに当該コア型の外周部に沿って上下動する抜き型を有し、コア型は少なくとも前記ネジ部に対応する表面部を表面粗さＲａにて２００ｎｍ〜４００ｎｍの無方向性の微小な凹凸面に形成してあり、前記抜き型はキャップの成型後に前記キャップのスカート端部に係止させつつ上方に向けて前進させることで当該キャップを前記コア型から無理抜き可能であることを特徴とする。
表面粗さは、表面粗さＲａにて２０ｎｍ〜８００ｎｍの微小凹凸、より好ましくは２００ｎｍ〜４００ｎｍの微小凹凸がよく、無方向性の微小な凹凸は、例えばショットブラスト処理にて形成する。
このように金型のキャビティ表面に微小の凹凸が形成されていると、微小の凹部の中までは樹脂が転写されないので、離型性がよくなる。
また、微小の凹凸により成型時のガス抜けが向上し樹脂の流動抵抗が小さくなり、成形性が向上する。
金型において、摺動部、スライド部等の表面を本発明に係る微小の凹凸にすると、そのままで摺動性に優れ、潤滑油の浸透性が向上するため潤滑油を用いた効果も大きい。
また、金型間の突き合せ部等のガス逃がし部の表面に本発明に係る微小凹凸を採用すると微小の凹凸間の間からのガスの逃がし効果が向上する。
微小な凹凸を形成する手段として、ショットブラスト技術を用いると、金型表面の圧縮残留応力により金型寿命が向上する。
The present invention is a mold for molding a cap having a threaded portion on the inside, wherein the mold is a core mold for molding an inner shape of a cap having a threaded portion that is an undercut shape, An outer mold for molding the outer shape, the core mold projecting from the base mold and has a punching mold that moves up and down along the outer periphery of the core mold , the core mold being at least The surface portion corresponding to the screw portion is formed in a non-directional micro uneven surface with a surface roughness Ra of 200 nm to 400 nm, and the die is locked to the skirt end portion of the cap after the cap is molded. However, the cap can be forcibly removed from the core mold by being advanced upward .
The surface roughness Ra is preferably 20 nm to 800 nm fine irregularities, more preferably 200 nm to 400 nm fine irregularities, and the non-directional minute irregularities are formed, for example, by shot blasting.
If minute irregularities are formed on the cavity surface of the mold in this way, the resin is not transferred into the minute depressions, so that the releasability is improved.
Moreover, the outgassing at the time of molding is improved by the minute unevenness, the flow resistance of the resin is reduced, and the moldability is improved.
In the mold, when the surface of the sliding portion, the sliding portion, etc. is made into the minute irregularities according to the present invention, the slidability is excellent as it is and the permeability of the lubricating oil is improved, so that the effect of using the lubricating oil is great.
Moreover, when the micro unevenness | corrugation which concerns on this invention is employ | adopted on the surface of gas escape parts, such as the butt | matching part between metal mold | dies, the escape effect of the gas from between between micro unevenness | corrugations will improve.
When shot blasting technology is used as means for forming minute irregularities, the mold life is improved by the compressive residual stress on the mold surface.
本発明は、無理抜き金型にも適用でき、成型される成型品はアンダーカット形状部を有し、前記アンダーカット形状部を成型するコア型と、当該コア型と対向してキャビティ部を形成する外型とを有し、前記コア型の少なくともアンダーカット形状部の表面は表面粗さＲａにて２０ｎｍ〜８００ｎｍの微小凹凸面に形成してあり、好ましくは２０ｎｍ〜４００ｎｍであり、さらに好ましくは２００ｎｍ〜４００ｎｍである。
ここで、コア型の外周部に沿って樹脂成型品を当該コア型から無理抜きするための抜き型を有している。
The present invention can also be applied to a forced die, and the molded product has an undercut shape portion, a core die for molding the undercut shape portion, and a cavity portion facing the core die. The surface of at least the undercut shape portion of the core mold is formed on a micro uneven surface with a surface roughness Ra of 20 nm to 800 nm, preferably 20 nm to 400 nm, more preferably 200 nm to 400 nm.
Here, a die for forcibly removing the resin molded product from the core die is provided along the outer periphery of the core die.
本発明は、一般金型に適用できる。
特に無理抜き金型に適用すると離型性がよいので、アンダーカット部の樹脂の変形及び離型が容易になる。
これにより、コア型を回転させる必要がなくなるために金型の開閉に制限がなくなり、成型サイクルタイムの短縮が可能になり、生産性が向上する。
また、金型の冷却系統の設計自由度が高くなる。
The present invention can be applied to a general mold.
In particular, when applied to a forced die, the releasability is good, and the deformation and release of the resin at the undercut portion becomes easy.
As a result, there is no need to rotate the core mold, so there is no restriction on the opening and closing of the mold, the molding cycle time can be shortened, and productivity is improved.
In addition, the degree of freedom in designing the mold cooling system is increased.
図１にネジ付きキャップを成型するための金型構造例を示し、図２に無理抜きの例を示す。
キャップの内側形状を成型するためのコア型１２に対して、キャップの外側形状を成型するための外型１１を配置してある。
本実施例では、キャップ１の上部の部分にスプルー１１ｂを設けた例になっているが、方案に制限はない。
成型品１であるキャップは、アンダーカット形状となるネジ部１ａと、キャップのスカート端部に係止部１ｂを有する。
コア型１２は、ベース型１３から突設してあり、コア型の外周部に沿って図１，２では、上下動する抜き型１４を有する。
抜き型のスライド構造に制限はないが、本実施例ではロッド１６にて前進させる。
この摺動部１６ａの金型表面、ロッド表面を２００ｍｍ〜４００ｍｍの微小凹凸に処理した。
これにより摺動性が向上した。
コア型１２の内部には、金型温調用の冷却路１５が形成されている。
コア型１２の少なくともネジ部等のアンダーカット部には、表面粗さ（Ｒａ）２０ｎｍ〜８００ｎｍの微小の無方向性の凹凸を形成してある。
本実施例では、ショットブラストにより、２００ｎｍ〜４００ｎｍの微小凹凸を形成した。
本実施例では、外型１１の内面を鏡面仕上げしてあり、上下方向の突条１１ｃを形成した例になっている。
抜き型１４を後退させ、図１に示すように射出成型した後に図２に示すように金型を開き、抜き型１４を前進させることでコア型１２から製品を無理抜きする。
図３（ａ）は本発明に係る金型を用いる場合、（ｂ）は従来の鏡面仕上げ金型を用いて成型した場合のネジ部の断面形状測定結果を示す。
評価には、ホモポリプロピレン樹脂を用いた。
この結果から、本発明に係る金型を用いると従来の金型と比較して、ネジ形状につぶれや変形がなく、硬質の樹脂材料を用いても無理抜き可能であることが分かる。
また、外型１１と抜き型１４の突当面１１ａを本発明に係る微小凹凸にすると、成型時のガス抜き性が向上した。
FIG. 1 shows an example of a mold structure for molding a threaded cap, and FIG.
An outer mold 11 for molding the outer shape of the cap is arranged with respect to the core mold 12 for molding the inner shape of the cap.
In the present embodiment, the sprue 11b is provided in the upper part of the cap 1, but the method is not limited.
The cap which is the molded product 1 has a screw part 1a having an undercut shape and a locking part 1b at the skirt end of the cap.
The core mold 12 protrudes from the base mold 13 and has a punching mold 14 that moves up and down in FIGS. 1 and 2 along the outer periphery of the core mold.
Although there is no restriction | limiting in the slide structure of a cutting die, it advances with the rod 16 in a present Example.
The surface of the mold and the rod of the sliding portion 16a were processed into minute irregularities of 200 mm to 400 mm.
This improved the slidability.
Inside the core mold 12, a cooling path 15 for mold temperature control is formed.
At least an undercut portion such as a screw portion of the core mold 12 is formed with minute non-directional irregularities having a surface roughness (Ra) of 20 nm to 800 nm.
In this example, minute irregularities of 200 nm to 400 nm were formed by shot blasting.
In the present embodiment, the inner surface of the outer mold 11 is mirror-finished to form an up-and-down ridge 11c.
The die 14 is retracted, injection molded as shown in FIG. 1, and then the mold is opened as shown in FIG.
FIG. 3 (a) shows the result of measuring the cross-sectional shape of the threaded portion when the mold according to the present invention is used, and FIG.
A homopolypropylene resin was used for the evaluation.
From this result, it can be seen that when the mold according to the present invention is used, the screw shape is not crushed or deformed as compared with the conventional mold, and can be forcibly removed even by using a hard resin material.
Further, when the abutting surfaces 11a of the outer mold 11 and the punching mold 14 are made to be minute irregularities according to the present invention, the gas venting property at the time of molding is improved.
１ 成型品
１ａ ネジ部
１ｂ 係止部
１１ 外型
１２ コア型
１３ ベース型
１４ 抜き型
１５ 冷却路
DESCRIPTION OF SYMBOLS 1 Molded product 1a Screw part 1b Locking part 11 Outer mold 12 Core mold 13 Base mold 14 Die mold 15 Cooling path
Claims (1)
前記金型はアンダーカット形状となるネジ部を有するキャップの内側形状を成型するためのコア型と、キャップの外側形状を成型するための外型とを有し、
前記コア型はベース型から突設してあるとともに当該コア型の外周部に沿って上下動する抜き型を有し、
コア型は少なくとも前記ネジ部に対応する表面部を表面粗さＲａにて２００ｎｍ〜４００ｎｍの無方向性の微小な凹凸面に形成してあり、
前記抜き型はキャップの成型後に前記キャップのスカート端部に係止させつつ上方に向けて前進させることで当該キャップを前記コア型から無理抜き可能であることを特徴とする樹脂成型用金型。
A mold for molding a cap having a threaded portion inside,
The mold has a core mold for molding the inner shape of the cap having a thread portion that is an undercut shape, and an outer mold for molding the outer shape of the cap,
The core mold protrudes from the base mold and has a punch that moves up and down along the outer periphery of the core mold,
The core mold has at least a surface portion corresponding to the screw portion formed on a non-directional micro uneven surface having a surface roughness Ra of 200 nm to 400 nm,
A die for resin molding, wherein the die can be forcibly removed from the core die by being advanced upward while being locked to the skirt end of the cap after the cap is molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014153378A JP5741877B1 (en) | 2014-07-29 | 2014-07-29 | Mold for resin molding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014153378A JP5741877B1 (en) | 2014-07-29 | 2014-07-29 | Mold for resin molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP5741877B1 true JP5741877B1 (en) | 2015-07-01 |
| JP2016030379A JP2016030379A (en) | 2016-03-07 |
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| JP2014153378A Expired - Fee Related JP5741877B1 (en) | 2014-07-29 | 2014-07-29 | Mold for resin molding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107932794A (en) * | 2017-11-22 | 2018-04-20 | 中山市华志模具精密设备科技有限公司 | A kind of mould for being used to be molded the plastic tube with position limiting convex ring |
| CN114683376A (en) * | 2022-03-29 | 2022-07-01 | 安徽紫朔环境工程技术有限公司 | A pottery microporous filter body preparation facilities for purifying harmful substance of industrial flue gas |
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| EP3448195B1 (en) | 2016-04-29 | 2022-11-09 | Aplix | Improved hook fastening device having improved edges |
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| JP2000052384A (en) * | 1998-08-05 | 2000-02-22 | Sekisui Koki Seisakusho:Kk | Injection molding die for molded product with undercut and undercut processing method for injection molded product |
| JP2001179747A (en) * | 1999-12-27 | 2001-07-03 | Suzuka Fuji Xerox Co Ltd | Mandrel for baking seamless belt of heat-shrinkable resin |
| JP2009096120A (en) * | 2007-10-18 | 2009-05-07 | Toshiba Corp | Mold releasing force measuring device, mold releasing force measuring method, resin molding device and manufacturing method of resin molded article |
| JP5461825B2 (en) * | 2008-11-05 | 2014-04-02 | 株式会社ブリヂストン | Blade for OA |
| JP2011002762A (en) * | 2009-06-22 | 2011-01-06 | Dnp Fine Chemicals Co Ltd | Molding having light antireflection effect |
| JP5561978B2 (en) * | 2009-09-18 | 2014-07-30 | 日本航空電子工業株式会社 | Mold for molding and processing method of mold surface |
| JP5606824B2 (en) * | 2010-08-18 | 2014-10-15 | 株式会社不二製作所 | Mold surface treatment method and mold surface-treated by the above method |
| JP5713346B2 (en) * | 2011-03-30 | 2015-05-07 | 日本クロージャー株式会社 | Mold structure for cap molding made of synthetic resin |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107932794A (en) * | 2017-11-22 | 2018-04-20 | 中山市华志模具精密设备科技有限公司 | A kind of mould for being used to be molded the plastic tube with position limiting convex ring |
| CN114683376A (en) * | 2022-03-29 | 2022-07-01 | 安徽紫朔环境工程技术有限公司 | A pottery microporous filter body preparation facilities for purifying harmful substance of industrial flue gas |
| CN114683376B (en) * | 2022-03-29 | 2023-10-31 | 安徽紫朔环境工程技术有限公司 | Ceramic microporous filter preparation device for purifying industrial flue gas harmful substances |
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| JP2016030379A (en) | 2016-03-07 |
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