JP4836484B2 - Split mold, surface treatment method and molded product - Google Patents

Split mold, surface treatment method and molded product Download PDF

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JP4836484B2
JP4836484B2 JP2005124879A JP2005124879A JP4836484B2 JP 4836484 B2 JP4836484 B2 JP 4836484B2 JP 2005124879 A JP2005124879 A JP 2005124879A JP 2005124879 A JP2005124879 A JP 2005124879A JP 4836484 B2 JP4836484 B2 JP 4836484B2
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split mold
mold
product
split
blasting
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JP2006297811A (en
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泰典 福田
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Bridgestone Corp
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Description

本発明は分割金型およびその表面処理方法に関し、詳しくは、熱可塑性エラストマー製品の成形に用いられる分割金型において、成形品の取り出しを容易にした分割金型およびその表面処理方法に関する。   The present invention relates to a split mold and a surface treatment method thereof, and more particularly to a split mold that facilitates removal of a molded product in a split mold used for molding a thermoplastic elastomer product and a surface treatment method thereof.

一般に、金型を用いた樹脂製品の成形においては、成形品を取り出す際の効率上、成形品は金型を開いたときに常にどちらか特定の側に残っていることが望ましい。通常は、分割金型のうち、製品取出し用の突き出しピンを配している可動側の分割型に成形品を残すように、金型設計時に配慮を行っている。   In general, in the molding of a resin product using a mold, it is desirable that the molded article always remain on one of the specific sides when the mold is opened, for efficiency in taking out the molded article. Normally, consideration is given to the mold design so that the molded product remains in the split mold on the movable side in which the protruding pins for taking out the product are arranged among the split molds.

このように成形品を残留させる側(または離型させる側)を決定するに当たっては、例えば、硬質樹脂製の成形品の場合には、従来、以下のような手法が用いられている。
(1)金型に製品形状を彫り込む際に、残したくない側の分割型を開き気味になるように、残したい側の分割型を閉じ気味(逆テーパー)になるように、夫々配する。
(2)成形品の図面交差内にて、同様なテーパー加工を故意に金型に施す。
(3)残したい側の分割型への成形品の接触表面積が大きくなるように配する。
(4)残したくない側の分割型表面に離型剤を塗布する。
(5)残したくない側の分割型表面に離型表面処理(テフロン(登録商標)樹脂コート等)を施す。
In determining the side on which the molded product remains (or on the side from which the mold is to be released), for example, in the case of a molded product made of a hard resin, the following methods are conventionally used.
(1) When engraving the product shape into the mold, arrange the split mold on the side you do not want to leave open, and close the split mold on the side you want to leave (reverse taper). .
(2) The same taper is intentionally applied to the mold within the intersection of the molded product drawings.
(3) Arrange so that the contact surface area of the molded product to the split mold on the side to be left increases.
(4) A release agent is applied to the split mold surface on the side that is not desired to remain.
(5) A release surface treatment (Teflon (registered trademark) resin coat or the like) is performed on the surface of the split mold that is not desired to be left.

また、軟質樹脂の場合には、次の方法がよく用いられる。
(1)成形品を残したい側の分割型の表面を鏡面磨き仕上げとする。
(2)残したい側の分割型への成形品の接触表面積が大きくなるように配する。
In the case of a soft resin, the following method is often used.
(1) The surface of the split mold on the side where the molded product is to be left is mirror-finished.
(2) Arrange so that the contact surface area of the molded product to the split mold on the side to be left increases.

このうち離型性の改良に係る技術としては、例えば、特許文献1に、成形開始直後および成形継続中における離型性を向上させ、安定した成形工程を得ることを目的として、成形型の成形素材と接触する表面に微細な凹凸処理を施した後、粒子状の樹脂材料によるブラスト処理を施す成形型の表面処理方法が記載されている。また、特許文献2には、成形品の離型性を向上させることで成形品の品質を向上することを目的として、コア型を用いるインジェクション成形用金型においてコア型の表面をブラスト処理する技術が記載されている。
特開2000−37732号公報(特許請求の範囲等) 特開2003−89173号公報(特許請求の範囲等)
Among these, as a technique related to the improvement of the mold release property, for example, Patent Document 1 describes the molding of a mold for the purpose of improving the mold release property immediately after the start of molding and during the molding and obtaining a stable molding process. A surface treatment method for a molding die is described in which a fine uneven treatment is performed on a surface in contact with a material, and then a blast treatment is performed with a particulate resin material. Patent Document 2 discloses a technique for blasting the surface of a core mold in an injection mold using a core mold for the purpose of improving the quality of the molded article by improving the releasability of the molded article. Is described.
JP 2000-37732 A (Claims etc.) JP 2003-89173 A (Claims etc.)

上述のように、硬質樹脂による成形品の金型残りを制御する技術は種々知られているが、硬質樹脂と軟質樹脂とでは力学的特性が異なるため、これらの技術を軟質樹脂による成形品に適用しても、一般にはうまくいかない。即ち、軟質樹脂は変形し易いために、残したい側の製品形状として無理抜き形状や逆テーパーをつけても、形を保ってその場に踏ん張ろうとする力が小さく、その効果は期待できない。また、テフロン(登録商標)コート等の離型表面処理を行っても、むしろ金型への密着性が上がって、逆効果となる場合が多いのである。   As described above, various techniques for controlling the mold residue of a molded product made of hard resin are known. However, since the mechanical properties of hard resin and soft resin are different, these technologies are changed to molded products made of soft resin. In general, it doesn't work. In other words, since the soft resin is easily deformed, even if a forcible shape or reverse taper is applied as the product shape on the side to be left, the force for maintaining the shape and stroking on the spot is small, and the effect cannot be expected. Further, even if a mold release surface treatment such as Teflon (registered trademark) coating is performed, the adhesion to the mold is rather improved, and the reverse effect is often obtained.

一方、軟質樹脂による成形品の金型残りを目的として、成形品を残したい側の分割型の表面に鏡面仕上げを行った場合には、鏡面仕上げを行った側と行っていない側とで成形品の表面の肌に差が生じたり、鏡面仕上げを行った側の表面にエアだまりが発生して、表面が凸凹になり易くなるなどの問題があった。また、このようなエアだまりが広い範囲で生ずると、密着性も低下するため、成形品の金型残りについても不安定になってしまう。このような成形品の金型残りの制御については、軟質樹脂、中でも、熱可塑性エラストマーを用いた成形品においてはまだ十分なものであるとはいえず、より確実に制御を行うことのできる技術が求められていた。   On the other hand, if the surface of the split mold on the side where you want to leave the molded product is mirror-finished for the purpose of remaining the mold of the molded product with soft resin, molding is performed on the side that has been mirrored and the side that has not been There are problems such as differences in the skin of the surface of the product, air accumulation on the surface on the mirror-finished surface, and the surface becoming easily uneven. In addition, when such air accumulation occurs in a wide range, the adhesiveness also decreases, and the mold rest of the molded product becomes unstable. As for the control of the mold rest of such a molded product, it cannot be said that it is still sufficient for a molded product using a soft resin, especially a thermoplastic elastomer, and can be controlled more reliably. Was demanded.

そこで本発明の目的は、上記問題を解消して、熱可塑性エラストマー製品の成形に用いられる分割金型において、成形品の金型残りの適切な制御を可能とすることで、成形品の取り出しを容易に行うことができる分割金型その表面処理方法及び成形品を提供することにある。 Accordingly, an object of the present invention is to solve the above-mentioned problems, and in a split mold used for molding a thermoplastic elastomer product, by allowing appropriate control of the mold remaining of the molded product, it is possible to take out the molded product. An object of the present invention is to provide a split mold , a surface treatment method thereof, and a molded product that can be easily performed.

本発明者は、上記課題を解決するために鋭意検討した結果、下記構成とすることにより、熱可塑性エラストマーを用いた成形品の金型残りを適切に制御することが可能となることを見出して、本発明を完成するに至った。   As a result of intensive investigations to solve the above problems, the present inventor has found that the remainder of the mold of a molded article using a thermoplastic elastomer can be appropriately controlled by adopting the following configuration. The present invention has been completed.

即ち、本発明の分割金型は、2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられる分割金型であって、成形された該熱可塑性エラストマー製品を残すべき分割型の内表面が、粒子径#120〜#220の投射材を用いたブラスト処理により、表面粗さRaで0.7〜1.42μmに形成されていることを特徴とするものである。 That is, the split mold of the present invention is composed of two or more split molds, and is a split mold used for molding a thermoplastic elastomer product, and the inner surface of the split mold in which the molded thermoplastic elastomer product should remain. However, the surface roughness Ra is formed to be 0.7 to 1.42 μm by blasting using a projection material having a particle size of # 120 to # 220 .

また、本発明の分割金型の表面処理方法は、2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられる分割金型の表面処理方法であって、該分割金型のうち、成形された該熱可塑性エラストマー製品を残すべき分割型の内表面を、当該内表面の表面粗さRaが0.7〜1.42μmとなるよう粒子径#120〜#220の投射材を用いてブラスト処理することを特徴とするものである。更に、本発明の成形品は、上記の分割金型を用いて成形された、熱可塑性エラストマーの成形品である。 Moreover, the surface treatment method for a split mold according to the present invention is a surface treatment method for a split mold, which is composed of two or more split molds and is used for molding a thermoplastic elastomer product. The inner surface of the split mold where the thermoplastic elastomer product should be left is blasted using a projection material having a particle diameter of # 120 to # 220 so that the surface roughness Ra of the inner surface is 0.7 to 1.42 μm. It is characterized by processing. Furthermore, the molded product of the present invention is a thermoplastic elastomer molded product molded using the above-described split mold.

本発明によれば、上記構成としたことで、従来は困難であった分割金型における熱可塑性エラストマー製品の金型残りの制御を確実に行うことができ、これにより、熱可塑性エラストマー製品の取り出しを容易に行うことができる分割金型およびその表面処理方法を実現することが可能となった。なお、前述したように、金型表面にブラスト処理を施す技術は公知であるが、いずれも成形品の離型性を高める目的で処理を行うものであり、本発明におけるように成形品を残すためにブラスト処理を行って所定の表面粗さとする技術はこれまで知られていない。本発明は、前述したように、軟質の熱可塑性エラストマー製品に特有の課題を解決するものである。   According to the present invention, with the above-described configuration, it is possible to reliably control the remaining mold of the thermoplastic elastomer product in the divided mold, which has been difficult in the past, and thereby, taking out the thermoplastic elastomer product. It is possible to realize a split mold and a surface treatment method thereof that can be easily performed. As described above, techniques for performing a blasting process on the mold surface are known, but both are performed for the purpose of improving the mold releasability of the molded product and leave the molded product as in the present invention. Therefore, a technique for performing a blasting process to obtain a predetermined surface roughness has not been known so far. As described above, the present invention solves the problems specific to soft thermoplastic elastomer products.

以下、本発明の好適実施形態につき詳細に説明する。
本発明の分割金型は、2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられるものであり、成形品を残すべき分割型の内表面が、ブラスト処理により、表面粗さRaで0.5〜3.0に形成されている点に特徴を有する。分割型の表面を、ブラスト処理により上記範囲の表面粗さに調整しておくことで、熱可塑性エラストマーを用いた成形品を、この分割型に確実に残留させることができ、かつ、従来の鏡面磨き仕上げを行った場合のような問題も生ずることがない。なお、上記表面粗さRaは、JIS B 0601−1994に規定されている算術平均粗さであり、同十点平均粗さRzでは3.0〜12程度に相当する。
Hereinafter, a preferred embodiment of the present invention will be described in detail.
The split mold of the present invention comprises two or more split molds, and is used for molding a thermoplastic elastomer product. The inner surface of the split mold where the molded product should be left has a surface roughness Ra by blasting. It is characterized in that it is formed at 0.5 to 3.0. By adjusting the surface of the split mold to a surface roughness in the above range by blasting, the molded product using the thermoplastic elastomer can be reliably left in this split mold, and the conventional mirror surface There is no problem as with the polished finish. The surface roughness Ra is an arithmetic average roughness defined in JIS B 0601-1994, and the ten-point average roughness Rz corresponds to about 3.0 to 12.

本発明に係るブラスト処理とは、投射材と呼ばれる粉体を空気の流れに混ぜて、被投射物に対し吹き付けることにより表面処理を行うものである。本発明においては、成形品を残すべき分割型の内表面を上記表面粗さに形成できるものであれば、ブラスト処理の条件に特に制限はないが、例えば、次の仕様にて処理を行うことができる。   In the blasting according to the present invention, a surface treatment is performed by mixing a powder called a projection material in a flow of air and spraying the powder onto a projection object. In the present invention, as long as the inner surface of the split mold where the molded product should be left can be formed with the above surface roughness, the blasting conditions are not particularly limited. For example, the processing is performed according to the following specifications. Can do.

投射材は、上記目的に合わせて適宜選択することができ、材質(硬度)としては、具体的には例えば、アルミナ、炭化ケイ素、シリカ、カーボンブラック、炭酸カルシウム、炭酸マグネシウム、タルク、クレー、ガラス繊維、ガラスバルーン、金属、酸化鉄、酸化鉄を含む化合物(フェライト等)等の繊維状物や粒状物、破砕状物などからなる無機投射材を好適に用いることができる。また、酸化鉄や酸化鉄を含む化合物(フェライト等)を含む顔料、具体的には、α−FeOOH、β−FeOOH、γ−FeOOH、α−Fe23、γ−Fe23、Fe34、MoFe23、Mo6Fe23等を用いてもよい。 The projection material can be appropriately selected in accordance with the above-mentioned purpose. Specifically, as the material (hardness), for example, alumina, silicon carbide, silica, carbon black, calcium carbonate, magnesium carbonate, talc, clay, glass Inorganic projection materials made of fibrous materials such as fibers, glass balloons, metals, iron oxide, iron oxide-containing compounds (ferrite, etc.), granular materials, crushed materials, and the like can be suitably used. In addition, pigments containing iron oxide and iron oxide-containing compounds (ferrite, etc.), specifically, α-FeOOH, β-FeOOH, γ-FeOOH, α-Fe 2 O 3 , γ-Fe 2 O 3 , Fe 3 O 4 , MoFe 2 O 3 , Mo 6 Fe 2 O 3 or the like may be used.

中でも、アルミナやシリカ、ガラス繊維は、硬度が高いので比較的強くブラスト処理する場合に好適である。一方、炭酸カルシウムや炭酸マグネシウム、タルク、クレーは、硬度が低いので比較的ソフトにブラスト処理する場合に好適である。ガラスバルーンは投射材の比重を小さくする場合に配合するのに好適であり、カーボンブラックを配合した場合には、投射材に導電性を付与することができる。これら無機投射材は、1種を単独で、または2種以上を適宜混合して用いることが可能である。   Among them, alumina, silica, and glass fiber are suitable for relatively strong blasting because of their high hardness. On the other hand, calcium carbonate, magnesium carbonate, talc, and clay are suitable for blasting relatively softly because of their low hardness. Glass balloons are suitable for blending when the specific gravity of the projection material is reduced, and when carbon black is blended, conductivity can be imparted to the projection material. These inorganic projection materials can be used singly or in appropriate combination of two or more.

また、投射材の形状としては、鋭利多角形状のものを用いることが、効率的なブラスト処理を行う上で有効である。投射材の粒径としては、特に制限されないが、通常、平均粒径で210〜85μm程度のものを用いる。この程度の平均粒径の投射材を用いることで、上記の表面粗さを、より効率良く実現することが可能となる。   In addition, it is effective to use a sharp polygonal shape as the shape of the projecting material for efficient blasting. Although it does not restrict | limit especially as a particle size of a projection material, Usually, a thing with an average particle diameter of about 210-85 micrometers is used. By using a projection material having such an average particle diameter, the above surface roughness can be realized more efficiently.

ブラスト処理に用いる投射装置(ブラスト装置)としては、投射材を、一定のスピードにて、一定の空気との混合比にて噴射できる機構をもつものであれば、その仕様については特に制限されるものではなく、用途や使用環境に応じて適宜選定して用いることができる。一般に、直噴式と呼ばれる装置では、投射材の切削効果が大きく金型へのダメージが大きいので、精密金型には間接式を用いることが望ましい。   As a projection device (blast device) used for the blasting process, the specification is particularly limited as long as it has a mechanism capable of injecting a projection material at a constant speed and a mixture ratio with a constant air. It is not a thing, but it can select suitably according to a use and use environment, and can use it. In general, in an apparatus called a direct injection type, since the cutting effect of the projection material is large and the damage to the mold is large, it is desirable to use an indirect type for the precision mold.

本発明は、スチレン系、オレフィン系、ウレタン系、エステル系等の各種の熱可塑性エラストマーに対して有効であるが、特には、特開平11−157092号公報に記載されている熱可塑性エラストマーを用いた成形に使用される分割金型に対し、より効果的である。本発明の分割金型は、その材質や具体的形状等についても、特に制限されないことはいうまでもない。   The present invention is effective for various types of thermoplastic elastomers such as styrene, olefin, urethane, and ester, and in particular, the thermoplastic elastomer described in JP-A-11-157092 is used. It is more effective for split molds used for molding. Needless to say, the split mold of the present invention is not particularly limited with respect to its material and specific shape.

また、本発明の分割金型の表面処理方法は、2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられる分割金型を表面処理するにあたり、分割金型のうち、成形された熱可塑性エラストマー製品を残すべき分割型の内表面を、表面粗さRaが0.5〜3.0(Rzでは3.0〜12)となるようブラスト処理するものであれば、対象となる分割金型やブラスト処理の条件等については特に制限されるものではなく、前述した投射材やブラスト装置等を適宜用いて行うことが可能である。   In addition, the surface treatment method for a split mold according to the present invention includes two or more split molds. When the split mold used for molding a thermoplastic elastomer product is subjected to surface treatment, If the inner surface of the split mold where the plastic elastomer product should be left is blasted so that the surface roughness Ra is 0.5 to 3.0 (3.0 to 12 for Rz), the target split gold There are no particular restrictions on the mold, blasting conditions, and the like, and the above-described projection material, blasting apparatus, or the like can be used as appropriate.

以下、本発明を、実施例を用いてより詳細に説明する。
(実施例1)
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行って、表面粗さをRa=1.42μm(Rz=6.4μm)とした。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #150
投射装置:直圧式
投射圧力:0.7MPa
被投射物(分割型)との距離:約1.5cm
投射時間:約5秒
Hereinafter, the present invention will be described in more detail with reference to examples.
Example 1
The surface roughness of Ra = 1 is obtained by subjecting the inner surface of the split mold for injection molding (material: NAK) of 16 pieces / surface to the side where the product is to be left, under the following conditions. .42 μm (Rz = 6.4 μm). Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 150
Projection device: Direct pressure projection pressure: 0.7 MPa
Distance to projectile (split type): about 1.5cm
Projection time: about 5 seconds

ブラスト処理前と処理後の分割金型を夫々用いて、下記配合の熱可塑性エラストマー原料を用いた成形品を製造した。成形時における金型温度は60℃、原料温度は190〜230℃とした。
(熱可塑性エラストマー原料配合)
スチレン−エチレン/ブチレン−スチレンブロック共重合体(数平均分子量20万,SP値(溶解度係数)8.5)100重量部と、パラフィン系オイル(出光興産(株)製,商品名:PW380,分子量750,SP値7.8)140重量部と、ポリプロピレン樹脂13重量部と、ポリフェニレンエーテル樹脂10重量部とを混練して、熱可塑性エラストマー原料を調製した。この熱可塑性エラストマー原料のJIS A硬度は20度であった。
A molded product using a thermoplastic elastomer raw material having the following composition was manufactured using each of the divided dies before and after the blast treatment. The mold temperature during molding was 60 ° C., and the raw material temperature was 190 to 230 ° C.
(Contains thermoplastic elastomer raw material)
100 parts by weight of styrene-ethylene / butylene-styrene block copolymer (number average molecular weight 200,000, SP value (solubility coefficient) 8.5) and paraffinic oil (manufactured by Idemitsu Kosan Co., Ltd., trade name: PW380, molecular weight) 750, SP value 7.8) 140 parts by weight, 13 parts by weight of polypropylene resin, and 10 parts by weight of polyphenylene ether resin were kneaded to prepare a thermoplastic elastomer raw material. This thermoplastic elastomer raw material had a JIS A hardness of 20 degrees.

結果として、ブラスト処理を施す前における製品を残したくない側の分割型への製品残りが15〜16個/ショットであったのに対し、ブラスト処理後における同分割型への製品残りは、0個/ショットであった。   As a result, the product remaining on the split mold on the side where it is not desired to leave the product before blasting was 15-16 pieces / shot, whereas the product remaining on the split mold after blasting was 0 It was a piece / shot.

(実施例2)
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行って、表面粗さをRa=1.2μm(Rz=5.9μm)とした。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #120
投射装置:サクション式(重力式、サイフォン式)
投射圧力:0.4MPa
被投射物(分割型)との距離:約10cm
投射時間:約45秒
(Example 2)
The surface roughness of Ra = 1 is obtained by subjecting the inner surface of the split mold for injection molding (material: NAK) of 16 pieces / surface to the side where the product is to be left, under the following conditions. .2 μm (Rz = 5.9 μm). Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 120
Projection device: Suction type (gravity type, siphon type)
Projection pressure: 0.4 MPa
Distance to projectile (divided type): about 10cm
Projection time: Approximately 45 seconds

ブラスト処理前と処理後の分割金型を夫々用いて、実施例1と同様にして熱可塑性エラストマー原料を用いた成形品を製造した。   A molded product using the thermoplastic elastomer raw material was produced in the same manner as in Example 1 using the divided dies before and after the blast treatment.

結果として、ブラスト処理を施す前における製品を残したくない側の分割型への製品残りが15〜16個/ショットであったのに対し、ブラスト処理後における同分割型への製品残りは、0個/ショットであった。   As a result, the product remaining on the split mold on the side where it is not desired to leave the product before blasting was 15-16 pieces / shot, whereas the product remaining on the split mold after blasting was 0 It was a piece / shot.

参考例1
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行って、表面粗さをRa=2.2μm(Rz=11μm)とした。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #80
投射装置:サクション式(重力式、サイフォン式)
投射圧力:0.4MPa
被投射物(分割型)との距離:約10cm
投射時間:約45秒
( Reference Example 1 )
The inner surface of the split mold on the side where the product is to be left of the split mold for injection molding (material: NAK) of 16 pieces / surface is blasted under the following conditions, and the surface roughness Ra = 2 .2 μm (Rz = 11 μm). Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 80
Projection device: Suction type (gravity type, siphon type)
Projection pressure: 0.4 MPa
Distance to projectile (divided type): about 10cm
Projection time: Approximately 45 seconds

ブラスト処理前と処理後の分割金型を夫々用いて、実施例1と同様にして熱可塑性エラストマー原料を用いた成形品を製造した。   A molded product using the thermoplastic elastomer raw material was produced in the same manner as in Example 1 using the divided dies before and after the blast treatment.

結果として、ブラスト処理を施す前における製品を残したくない側の分割型への製品残りが15〜16個/ショットであったのに対し、ブラスト処理後における同分割型への製品残りは、0個/ショットであった。   As a result, the product remaining on the split mold on the side where it is not desired to leave the product before blasting was 15-16 pieces / shot, whereas the product remaining on the split mold after blasting was 0 It was a piece / shot.

(実施例
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行って、表面粗さをRa=0.7μm(Rz=3.8μmとした。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #220
投射装置:サクション式(重力式、サイフォン式)
投射圧力:0.4MPa
被投射物(分割型)との距離:約10cm
投射時間:約45秒
(Example 3 )
The inner surface of the split mold on the side where the product is to be left of the split mold for injection molding (material: NAK) with 16 pieces / surface is subjected to blasting under the following conditions, and the surface roughness Ra = 0 0.7 μm (Rz = 3.8 μm. Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 220
Projection device: Suction type (gravity type, siphon type)
Projection pressure: 0.4 MPa
Distance to projectile (divided type): about 10cm
Projection time: Approximately 45 seconds

ブラスト処理前と処理後の分割金型を夫々用いて、実施例1と同様にして熱可塑性エラストマー原料を用いた成形品を製造した。   A molded product using the thermoplastic elastomer raw material was produced in the same manner as in Example 1 using the divided dies before and after the blast treatment.

結果として、ブラスト処理を施す前における製品を残したくない側の分割型への製品残りが15〜16個/ショットであったのに対し、ブラスト処理後における同分割型への製品残りは、0個/ショットであった。   As a result, the product remaining on the split mold on the side where it is not desired to leave the product before blasting was 15-16 pieces / shot, whereas the product remaining on the split mold after blasting was 0 It was a piece / shot.

(比較例1)
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行った。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #46
投射装置:直圧式
投射圧力:0.5MPa
被投射物(分割型)との距離:約2cm
投射時間:約5秒
(Comparative Example 1)
A blasting process was performed on the inner surface of the split mold on the side where the product was to be left of the split mold for injection molding (material: NAK) with 16 pieces / surface. Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 46
Projection device: Direct pressure projection pressure: 0.5 MPa
Distance to projectile (split type): approx. 2cm
Projection time: about 5 seconds

この場合、ブラスト処理面の表面粗さRaは3.0を超えてしまい、従ってブラスト処理による金型(表面)へのダメージが大きく、精密成形用の金型には適さなかった。   In this case, the surface roughness Ra of the blasted surface exceeded 3.0, and therefore, the damage to the mold (surface) due to the blasting was great, and it was not suitable for a mold for precision molding.

(比較例2)
16個取り/面の射出成形用分割金型(材質:NAK)の、製品を残したい側の分割型の内表面に対し、以下の条件でブラスト処理を行って、表面粗さをRa=0.2μm(Rz=1μm)とした。なお、ブラスト処理が不要の部分にはあらかじめマスキングを行った。
投射材:炭化ケイ素 #320
投射装置:サクション式(重力式、サイフォン式)
投射圧力:0.4MPa
被投射物(分割型)との距離:約10cm
投射時間:約45秒
(Comparative Example 2)
The inner surface of the split mold on the side where the product is to be left of the split mold for injection molding (material: NAK) with 16 pieces / surface is subjected to blasting under the following conditions, and the surface roughness Ra = 0 .2 μm (Rz = 1 μm). Note that masking was performed in advance on the portions that did not require blasting.
Projection Material: Silicon Carbide # 320
Projection device: Suction type (gravity type, siphon type)
Projection pressure: 0.4 MPa
Distance to projectile (divided type): about 10cm
Projection time: Approximately 45 seconds

ブラスト処理前と処理後の分割金型を夫々用いて、実施例1と同様にして熱可塑性エラストマー原料を用いた成形品を製造した。   A molded product using the thermoplastic elastomer raw material was produced in the same manner as in Example 1 using the divided dies before and after the blast treatment.

結果として、ブラスト処理を施す前における製品を残したくない側の分割型への製品残りが15〜16個/ショットであったのに対し、ブラスト処理後における同分割型への製品残りは10個/ショットであり、金型残りの制御が不十分であることがわかった。
これらの結果を、下記の表1中にまとめて示す。
As a result, the product remaining on the split mold on the side where it is not desired to leave the product before blasting was 15-16 pieces / shot, whereas the remaining product on the split mold after blasting was 10 / Shot and it was found that the remaining mold control was insufficient.
These results are summarized in Table 1 below.

Figure 0004836484
1)#46:250〜600μm
#80:125〜300μm
#120:63〜180μm
#150:45〜150μm
#220:40〜127μm
#320:23〜86μm
Figure 0004836484
1) # 46: 250-600 μm
# 80: 125-300 μm
# 120: 63-180 μm
# 150: 45-150 μm
# 220: 40-127 μm
# 320: 23-86 μm

Claims (3)

2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられる分割金型であって、成形された該熱可塑性エラストマー製品を残すべき分割型の内表面が、粒子径#120〜#220の投射材を用いたブラスト処理により、表面粗さRaで0.7〜1.42μmに形成されていることを特徴とする分割金型。 A split mold comprising two or more split molds and used for molding a thermoplastic elastomer product, and the inner surface of the split mold in which the molded thermoplastic elastomer product should be left has a particle size of # 120 to # 220 A split mold having a surface roughness Ra of 0.7 to 1.42 [mu] m by blasting using a projection material . 2以上の分割型からなり、熱可塑性エラストマー製品の成形に用いられる分割金型の表面処理方法であって、該分割金型のうち、成形された該熱可塑性エラストマー製品を残すべき分割型の内表面を、当該内表面の表面粗さRaが0.7〜1.42μmとなるよう粒子径#120〜#220の投射材を用いてブラスト処理することを特徴とする分割金型の表面処理方法。 A surface treatment method for a split mold comprising two or more split molds and used for molding a thermoplastic elastomer product, and among the split molds, the split mold in which the molded thermoplastic elastomer product should remain A surface treatment method for a split mold, wherein the surface is blasted using a projection material having a particle size of # 120 to # 220 so that the surface roughness Ra of the inner surface is 0.7 to 1.42 μm . 請求項1記載の分割金型を用いて成形された、熱可塑性エラストマーの成形品。A molded product of a thermoplastic elastomer molded using the split mold according to claim 1.
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