JP5476251B2 - Thin-walled deep-drawn molded product and its manufacturing method - Google Patents
Thin-walled deep-drawn molded product and its manufacturing method Download PDFInfo
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Description
本発明は、ポリフェニレンスルフィド(PPS)を含む樹脂組成物からなる薄肉深絞り成形品とその製造方法に関する。 The present invention relates to a thin-walled deep-drawn molded article made of a resin composition containing polyphenylene sulfide (PPS) and a method for producing the same.
PPSと無機充填剤等を含むPPS樹脂組成物は、成形物が優れた機械的性質、耐熱性、耐薬品性、電気特性を有するため、自動車、電気・電子部品、化学機器等の部品材料として汎用されている。 PPS resin compositions containing PPS and inorganic fillers have excellent mechanical properties, heat resistance, chemical resistance, and electrical properties, so that they can be used as parts materials for automobiles, electrical / electronic parts, chemical equipment, etc. It is widely used.
PPS樹脂組成物は、通常、射出成形にて成形されている。射出成形では、PPSの結晶化を促進させるために昇温結晶化温度(Tcc)近くに熱した金型で成形・冷却を行うため、薄肉製品では、金型からインジェクトするときに変形を起こしてしまい、寸法精度のよい薄肉成形品を得ることができない。 The PPS resin composition is usually formed by injection molding. In injection molding, molding and cooling are performed with a mold heated near the temperature-rising crystallization temperature (Tcc) to promote crystallization of PPS. Therefore, thin-walled products are deformed when injected from the mold. Therefore, it is impossible to obtain a thin-walled molded article with good dimensional accuracy.
特許文献1には、押出成形によるPPSからなるチューブ状の薄肉成形品の連続成形方法が記載されている。しかし、チューブ状の薄肉成形品から薄肉深絞り成形品を製造する方法については記載されていない。 Patent Document 1 describes a continuous molding method of a tubular thin-walled molded product made of PPS by extrusion molding. However, it does not describe a method for producing a thin-walled deep-drawn molded product from a tubular thin-walled molded product.
特許文献2の請求項1には、結晶性ポリアリーレンサルファイド樹脂又はその組成物を溶融押出後急冷して実質上非晶性のシートを成形し、このシートを該樹脂の少なくともガラス転移温度(Tg ) 以上昇温結晶化温度(Tcc)以下の温度に予熱し、次いで昇温結晶化温度以上、融点(Tm )下10℃までの温度に設定した金型を用いて、真空成形又は圧縮成形することを特徴とする結晶性ポリアリーレンサルファイド樹脂薄肉成形品の製造法が記載されている。実施例では、底径6cm、上部径8cm、高さ5cmのカップ状成形品を熱成形したことが記載されている。
しかし、深絞り品に成形すると、シートが真空成形時の伸びに追随できず千切れてしまったり、穴が開いたりして成形品にならない。
According to claim 1 of Patent Document 2, a crystalline polyarylene sulfide resin or a composition thereof is melt-extruded and rapidly cooled to form a substantially amorphous sheet, and this sheet is at least a glass transition temperature (T) of the resin. g ) Using a mold that has been preheated to a temperature not higher than the temperature-rising crystallization temperature (T cc ) and then not lower than the temperature-rising crystallization temperature and below the melting point (T m ) to 10 ° C., vacuum forming or A process for producing a crystalline polyarylene sulfide resin thin-walled molded product characterized by compression molding is described. In the examples, it is described that a cup-shaped molded product having a bottom diameter of 6 cm, a top diameter of 8 cm, and a height of 5 cm was thermoformed.
However, when formed into a deep-drawn product, the sheet cannot follow the elongation during vacuum forming and is cut off or a hole is formed, resulting in a molded product.
本発明は、耐熱性や機械的性質等の良い薄肉深絞り成形品を提供することを課題とする。
また本発明は、前記薄肉深絞り成形品を高い寸法精度で得ることができる薄肉深絞り成形品の製造方法を提供することを他の課題とする。
An object of the present invention is to provide a thin-walled deep-drawn molded article having good heat resistance and mechanical properties.
Another object of the present invention is to provide a method for manufacturing a thin-walled deep-drawn molded product that can obtain the thin-walled deep-drawn molded product with high dimensional accuracy.
本発明は、課題の解決手段として、
ポリフェニレンスルフィド(PPS)を含む樹脂組成物からなる、真空成形又は圧空成形された薄肉深絞り成形品であり、
前記PPSが、溶融粘度(測定条件:温度310℃,剪断速度1200s-1)が350〜1000Pa・sのものであり、
下記の(a)〜(d)を満たすものである薄肉深絞り成形品を提供する。
(a)前記成形品の開口部面積に対する底部面積の比が0.7以上の範囲
(b)前記成形品の開口部形状の長辺又は内径に対する成形品の深さの比(絞り比)が0.8以上の範囲
(c)前記成形品の平面部(角部を除く意味である)の異なる2つの高さにおける平均厚みt1及びt2の比(t1/t2)が0.8〜1.2の範囲
(d)PPSの結晶化度が23〜33%
As a means for solving the problems, the present invention
It is a thin-walled deep-drawn molded product formed of a resin composition containing polyphenylene sulfide (PPS), vacuum-formed or pressure-formed,
The PPS has a melt viscosity (measurement conditions: temperature 310 ° C., shear rate 1200 s −1 ) of 350 to 1000 Pa · s,
A thin-walled deep-drawn molded product that satisfies the following (a) to (d) is provided.
(A) The ratio of the bottom area to the opening area of the molded product is 0.7 or more. (B) The ratio (drawing ratio) of the depth of the molded product to the long side or the inner diameter of the opening shape of the molded product. The range of 0.8 or more (c) The ratio (t1 / t2) of the average thicknesses t1 and t2 at two different heights of the flat part (meaning excluding corners) of the molded product is 0.8 to 1. Range of 2 (d) PPS crystallinity is 23-33%
また本発明は、他の課題の解決手段として、
請求項1記載の薄肉深絞り成形品の製造方法であり、
溶融粘度が350〜1000Pa・sであるポリフェニレンスルフィド(PPS)を含む樹脂組成物からなるシートを得る工程、
前工程で得られたシートに対して、昇温結晶化温度(Tcc)+50℃から融点(Tm)−10℃までの温度範囲で維持して予熱処理する工程、
予熱処理したシートを昇温結晶化温度(Tcc)以上の温度から融点(Tm)−10℃までの温度範囲で維持した金型に入れた後、真空成形又は圧空成形する工程、
を有している、薄肉深絞り成形品の製造方法を提供する。
The present invention also provides a solution to other problems.
A method for producing a thin-walled deep-drawn product according to claim 1,
A step of obtaining a sheet comprising a resin composition containing polyphenylene sulfide (PPS) having a melt viscosity of 350 to 1000 Pa · s,
A step of pre-heat-treating the sheet obtained in the previous step while maintaining it in a temperature range from a temperature rising crystallization temperature (Tcc) + 50 ° C. to a melting point (Tm) −10 ° C.,
A step in which the preheated sheet is placed in a mold maintained in a temperature range from a temperature equal to or higher than a temperature-rising crystallization temperature (Tcc) to a melting point (Tm) −10 ° C., and then subjected to vacuum forming or pressure forming.
A method for producing a thin-walled deep-drawn molded product having
本発明の薄肉深絞り成形品は、寸法精度が高く、1つの成形品における厚みのばらつきがなく、多数の成形品間における厚みのばらつきもない。
本発明の薄肉深絞り成形品は、PPSを含むものであることから、耐熱性、機械的性質、耐薬品性、電気特性が良いので、本発明の製造方法を適用することにより、前記性質を有する寸法精度の高い各種部品を提供することができる。
The thin-walled deep-drawn molded product of the present invention has high dimensional accuracy, no variation in thickness in one molded product, and no variation in thickness among many molded products.
Since the thin-walled deep-drawn molded product of the present invention contains PPS, it has good heat resistance, mechanical properties, chemical resistance, and electrical properties. By applying the production method of the present invention, the dimensions having the above properties are obtained. Various parts with high accuracy can be provided.
<薄肉深絞り成形品>
本発明で用いる樹脂組成物に含まれるPPSは、ホモポリマーでもよいし、コポリマーでもよい。ホモポリマーの場合は線状ポリマーが好ましい。
<Thin wall deep-drawn product>
The PPS contained in the resin composition used in the present invention may be a homopolymer or a copolymer. In the case of a homopolymer, a linear polymer is preferable.
コポリマーは、p−フェニレン基を含む構成単位と、他のアリーレン基(好ましくはm−フェニレン基)を含む構成単位のコポリマーを挙げることができるが、成形性、耐熱性、機械的特性の点から、p−フェニレン基を含む構成単位の比率が60モル%以上のものが好ましく、70モル%以上のものがより好ましい。コポリマーは、ランダム結合でも、ブロック結合でもよいが、ブロック結合のものの方が、耐熱性、機械的特性の点から好ましい。 Examples of the copolymer include a copolymer of a structural unit containing a p-phenylene group and a structural unit containing another arylene group (preferably m-phenylene group). From the viewpoint of moldability, heat resistance, and mechanical properties. The proportion of structural units containing a p-phenylene group is preferably 60 mol% or more, more preferably 70 mol% or more. The copolymer may be a random bond or a block bond, but a block bond is preferred from the viewpoint of heat resistance and mechanical properties.
PPS(ホモポリマー又はコポリマー)は、溶融粘度(測定条件:温度310℃,剪断速度1200s-1)が350〜1000Pa・sであり、好ましくは450〜600Pa・sである。 PPS (homopolymer or copolymer) has a melt viscosity (measurement conditions: temperature 310 ° C., shear rate 1200 s −1 ) of 350 to 1000 Pa · s, preferably 450 to 600 Pa · s.
本発明で用いる樹脂組成物には、必要に応じて、本発明の課題を解決できる範囲の量及び種類の熱可塑性を配合することができる。
このような熱可塑性樹脂はPPSよりも融点が低いものが好ましく、ポリエチレン、ポリプロピレン又はこれらの変性重合体等のポリオレフィンを主体とするオレフィン系重合体又は共重合体;ナイロン6、ナイロン66、その他のポリアミド系重合体又は共重合体;ポリエチレンテレフタレート、ポリブチレンテレフタレート等を主体とするポリエステル重合体又は共重合体;液晶性ポリエステル重合体;ポリスチレン、ポリアクリロニトリル、ABS等のスチレン系重合体;ポリアルキルアクリレート等のアクリル系重合体;ポリカーボネート、ポリフェニレンオキサイド、ポリアセタール等を挙げることができる。これらの熱可塑性樹脂は、2種以上を使用することができる。
If necessary, the resin composition used in the present invention can be blended with an amount and a kind of thermoplasticity within a range that can solve the problems of the present invention.
Such a thermoplastic resin preferably has a melting point lower than that of PPS, and is an olefin polymer or copolymer mainly composed of polyolefin such as polyethylene, polypropylene or a modified polymer thereof; nylon 6, nylon 66, other Polyamide polymer or copolymer; Polyester polymer or copolymer mainly composed of polyethylene terephthalate, polybutylene terephthalate, etc .; Liquid crystalline polyester polymer; Styrene polymer such as polystyrene, polyacrylonitrile, ABS; Polyalkyl acrylate And acrylic polymers such as polycarbonate, polyphenylene oxide, polyacetal and the like. Two or more of these thermoplastic resins can be used.
本発明で用いる樹脂組成物には、薄肉成形品に要求される性質等に応じて、粒状、繊維状又はフレーク状(板状)充填材から選ばれる1種又は2種以上を配合することができる。 The resin composition used in the present invention may contain one or more selected from granular, fibrous or flaky (plate-like) fillers depending on the properties required for the thin molded article. it can.
繊維状充填材としては、ガラス繊維、カーボン繊維、シリカ繊維、シリカ・アルミナ繊維、ジルコニウム繊維、窒化硼素繊維、窒化珪素繊維、硼素繊維、チタン酸カリウム繊維のほか、ステンレス、アルミニウム、チタン、銅、黄銅等の繊維を挙げることができ、これらの中でも、ガラス繊維、カーボン繊維が好ましい。 Examples of the fibrous filler include glass fiber, carbon fiber, silica fiber, silica / alumina fiber, zirconium fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate fiber, stainless steel, aluminum, titanium, copper, Examples thereof include fibers such as brass, and among these, glass fibers and carbon fibers are preferable.
繊維状充填材は、平均繊維長が1〜800μmのものが好ましく、より好ましくは5〜600μmのものである。前記範囲のものを用いると、薄肉成形品の寸法安定性が良くなり、外観も良くなる。平均繊維長さは、計数法(走査型電子顕微鏡で観察し、充填材の大きさを測定する方法)によって求める。 The fibrous filler preferably has an average fiber length of 1 to 800 μm, more preferably 5 to 600 μm. When the product within the above range is used, the dimensional stability of the thin molded product is improved and the appearance is also improved. The average fiber length is determined by a counting method (a method of observing with a scanning electron microscope and measuring the size of the filler).
粒状充填材としては、カーボンブラック、黒鉛、シリカ、石英粉末、ガラスビーズ、ガラス粉、珪酸カルシウム、珪酸アルミニウム、カオリン、タルク、クレー、珪藻土、ウォラストナイトのような珪酸塩、酸化鉄、酸化チタン、アルミナのような金属の酸化物、炭酸カルシウム、炭酸マグネシウムのような金属の炭酸塩、硫酸カルシウム、硫酸バリウムのような金属の硫酸塩、その他、炭化珪素、窒化珪素、窒化硼素、各種金属粉末等を挙げることができる。 As granular fillers, carbon black, graphite, silica, quartz powder, glass beads, glass powder, calcium silicate, aluminum silicate, kaolin, talc, clay, diatomaceous earth, silicates such as wollastonite, iron oxide, titanium oxide Metal oxides such as alumina, metal carbonates such as calcium carbonate and magnesium carbonate, metal sulfates such as calcium sulfate and barium sulfate, silicon carbide, silicon nitride, boron nitride, various metal powders Etc.
粒状充填材は、平均粒径が1〜800μmのものが好ましく、より好ましくは5〜600μmのものである。前記範囲のものを用いると、薄肉成形品の寸法安定性が良くなり、外観も良くなる。平均粒径は、計数法(走査型電子顕微鏡で観察し、充填材の大きさを測定する方法)によって求める。 The granular filler preferably has an average particle diameter of 1 to 800 μm, more preferably 5 to 600 μm. When the product within the above range is used, the dimensional stability of the thin molded product is improved and the appearance is also improved. The average particle diameter is determined by a counting method (a method of observing with a scanning electron microscope and measuring the size of the filler).
フレーク状充填材としては、マイカ、ガラスフレーク、各種金属箔等を挙げることができる。 Examples of the flaky filler include mica, glass flakes and various metal foils.
フレーク状充填材は、平均最大長さが1〜800μmのものが好ましく、より好ましくは5〜600μmのものである。前記範囲のものを用いると、薄肉成形品の寸法安定性が良くなり、外観も良くなる。平均最大長さは、計数法(走査型電子顕微鏡で観察し、充填材の大きさを測定する方法)によって求める。 The flaky filler preferably has an average maximum length of 1 to 800 μm, more preferably 5 to 600 μm. When the product within the above range is used, the dimensional stability of the thin molded product is improved and the appearance is also improved. The average maximum length is obtained by a counting method (a method of observing with a scanning electron microscope and measuring the size of the filler).
これらの充填材は、必要に応じて、次亜燐酸又はその塩を表面に付着させたものを用いてもよく、収束剤を用いて収束したものを用いてもよく、表面処理剤(エポキシ系化合物、イソシアナート系化合物、シラン系化合物、チタネート系化合物)を用いて表面処理したものを用いてもよい。 As necessary, these fillers may be prepared by adhering hypophosphorous acid or a salt thereof to the surface, or may be converged by using a sizing agent. Compounds, isocyanate compounds, silane compounds, titanate compounds) that have been surface-treated may be used.
これらの充填材の配合量は、PPS100質量部に対して1〜200質量部が好ましく、5〜100質量部がより好ましく、10〜50質量部が更に好ましい。 1-200 mass parts is preferable with respect to 100 mass parts of PPS, as for the compounding quantity of these fillers, 5-100 mass parts is more preferable, and 10-50 mass parts is still more preferable.
また、上記充填材とは別に、必要に応じて有機質充填材を補助的に配合することができる。有機質充填材としては、フッ素樹脂、芳香族ポリアミド等の高融点の繊維状又は粉粒状の重合体を用いることができる。 In addition to the filler, an organic filler can be supplementarily blended as necessary. As the organic filler, a high melting point fibrous or powdery polymer such as fluororesin and aromatic polyamide can be used.
また樹脂組成物には、薄肉深絞り成形品の用途に応じて、各種添加剤、例えば、顔料、紫外線吸収剤、酸化防止剤、熱安定剤、滑剤、難燃剤、離型剤、その他の公知の添加剤を配合することができる。 In addition, various additives such as pigments, ultraviolet absorbers, antioxidants, thermal stabilizers, lubricants, flame retardants, release agents, and other known additives are used for the resin composition depending on the use of the thin-walled deep-drawn molded product. Additives can be blended.
本発明の薄肉深絞り成形品は、真空成形又は圧空成形されたものであり、下記の(a)〜(d)を満たすものである。
(a)前記成形品の開口部面積に対する底部面積(底部面積/開口部面積)が0.7以上であり、本発明では0.8〜1.0が好適である。
(b)前記成形品の開口部形状の長辺又は内径に対する成形品の深さの比(成形品の深さ/成形品の開口部形状の長辺又は内径)(絞り比)が0.8以上であり、本発明では0.8〜1.1が好適である。
(c)前記成形品の平面部(角部を除く意味である)の異なる2つの高さにおける平均厚みt1及びt2の比(t1/t2)が0.8〜1.2であり、好ましくは0.9〜1.1である。
なお、前記の異なる2つの高さは、全高さの33%の高さ位置と、67%の高さ位置とする。実施例では、底面から10mmと20mmの高さである。
(d)PPSの結晶化度が23〜33%である。
The thin-walled deep-drawn molded product of the present invention is formed by vacuum forming or pressure forming, and satisfies the following (a) to (d).
(A) The bottom area (bottom area / opening area) with respect to the opening area of the molded product is 0.7 or more, and 0.8 to 1.0 is preferable in the present invention.
(B) Ratio of the depth of the molded product to the long side or inner diameter of the opening shape of the molded product (depth of the molded product / long side or inner diameter of the opening shape of the molded product) (drawing ratio) is 0.8. In the present invention, 0.8 to 1.1 is preferable.
(C) The ratio (t1 / t2) of the average thicknesses t1 and t2 at two different heights of the flat part (meaning excluding the corners) of the molded product is 0.8 to 1.2, preferably 0.9-1.1.
The two different heights are a height position of 33% of the total height and a height position of 67%. In the embodiment, the height is 10 mm and 20 mm from the bottom surface.
(D) The crystallinity of PPS is 23 to 33%.
<薄肉深絞り成形品の製造方法>
最初の工程で、溶融粘度が350〜1000Pa・s(好ましくは450〜600Pa・s)であるPPSを含む樹脂組成物からなるシートを得る。
<Manufacturing method of thin-walled deep-drawn product>
In the first step, a sheet made of a resin composition containing PPS having a melt viscosity of 350 to 1000 Pa · s (preferably 450 to 600 Pa · s) is obtained.
この工程は、公知の方法(例えば特許文献2の実施例に記載の方法)を適用してシートを得ることができる。得られたシートは、結晶化されていてもよいし、結晶化されていなくてもよい。 In this step, a sheet can be obtained by applying a known method (for example, a method described in Examples of Patent Document 2). The obtained sheet may be crystallized or may not be crystallized.
次の工程において、成形機(真空成形機又は圧空成形機)により、前工程で得られたシートに対して、昇温結晶化温度(Tcc)+50℃から融点(Tm)−10℃までの温度範囲、好ましくは昇温結晶化温度(Tcc)+100℃から融点(Tm)−20℃までの温度範囲で維持して予熱処理する。予熱時間は、シートが上記温度範囲になるまでの時間である。 In the next step, the temperature obtained from the temperature rising crystallization temperature (Tcc) + 50 ° C. to the melting point (Tm) −10 ° C. with respect to the sheet obtained in the previous step by a forming machine (vacuum forming machine or pressure forming machine). Pre-heat treatment is performed while maintaining the temperature range, preferably the temperature rising crystallization temperature (Tcc) + 100 ° C. to the melting point (Tm) −20 ° C. The preheating time is the time until the sheet reaches the above temperature range.
予熱温度が前記下限値以上であると、寸法精度良く深絞り成形品を得ることができ、予熱温度が前記上限値以下であると、成形時のドローダウンが防止できる。 When the preheating temperature is equal to or higher than the lower limit value, a deep-drawn molded product can be obtained with high dimensional accuracy, and when the preheating temperature is equal to or lower than the upper limit value, drawdown during molding can be prevented.
次の工程において、前工程で予熱処理したシートを昇温結晶化温度(Tcc)以上の温度から融点(Tm)−10℃までの温度範囲で維持した金型に入れた後、真空成形又は圧空成形する。前記温度範囲は、昇温結晶化温度(Tcc)+5℃以上から融点(Tm)−20℃までの温度範囲が好ましい。 In the next step, the sheet pre-heated in the previous step is placed in a mold maintained in a temperature range from a temperature higher than the crystallization temperature (Tcc) to the melting point (Tm) -10 ° C., and then vacuum forming or compressed air Mold. The temperature range is preferably a temperature range from a temperature rising crystallization temperature (Tcc) + 5 ° C. to a melting point (Tm) −20 ° C.
金型温度が前記下限値以上であると、寸法精度良く深絞り成形品を得ることができ、金型温度が前記上限値以下であると、PPSが所定範囲の結晶化度に結晶化され、成形品の耐熱性や機械的性質等を高めることができる。 When the mold temperature is equal to or higher than the lower limit value, a deep-drawn molded product can be obtained with high dimensional accuracy, and when the mold temperature is equal to or lower than the upper limit value, PPS is crystallized to a crystallinity within a predetermined range, The heat resistance and mechanical properties of the molded product can be improved.
なお、本工程において、前工程で予熱処理したシートを昇温結晶化温度(Tcc)未満の温度に維持した金型で成形した後、再度、昇温結晶化温度(Tcc)以上に加熱して結晶化する方法を適用することもできる。 In this step, the sheet pre-heated in the previous step is molded with a mold maintained at a temperature lower than the temperature rising crystallization temperature (Tcc), and then heated again to the temperature higher than the temperature rising crystallization temperature (Tcc). A method of crystallization can also be applied.
(1)溶融粘度
温度310℃,剪断速度1200s-1において、東洋精機製のキャピログラフを用いて測定した。
(1) Melt viscosity Measured using a capillograph manufactured by Toyo Seiki at a temperature of 310 ° C. and a shear rate of 1200 s −1 .
(2)温度測定
JIS K−7121に準じた。PPSのガラス転移温度(Tg)、昇温結晶化温度(Tcc)、融点(Tm)は、示差走査熱量測定計(DSC)を用い、20℃/分の速度で昇温したときの熱量曲線の変曲点又は発熱ピークから求めた。
(2) Temperature measurement Conforms to JIS K-7121. The glass transition temperature (Tg), temperature rising crystallization temperature (Tcc), and melting point (Tm) of PPS are the calorimetric curve when the temperature is raised at a rate of 20 ° C./min using a differential scanning calorimeter (DSC). It calculated | required from the inflection point or the exothermic peak.
(3)シート成形性
押出機によるシート成形性を下記の基準で評価した。
○:成形時、樹脂圧力が適正 (5Mpa以下)
△:成形時、樹脂圧力がやや高い (7Mpa以下)
×:成形時、樹脂圧力が高い (15Mpa以上)
(3) Sheet formability Sheet formability by an extruder was evaluated according to the following criteria.
○: Resin pressure is appropriate during molding (5Mpa or less)
Δ: Resin pressure is slightly high during molding (7Mpa or less)
X: Resin pressure is high during molding (15Mpa or more)
(4)シート外観
成形後のシート外観を肉眼で観察し、下記の基準で評価した。
○:フローマークが目立たない。外観良好。
△:フローマークは見えるが、大きな凹凸がない。
×:フローマークが目立つ。外観悪い。
(4) Sheet appearance The molded sheet appearance was observed with the naked eye and evaluated according to the following criteria.
○: The flow mark is inconspicuous. Appearance is good.
Δ: The flow mark is visible, but there are no large irregularities.
X: A flow mark is conspicuous. Appearance is bad.
(5)成形性
金型形状どおりにシートが伸びる場合を良好とした。
(5) Formability The case where the sheet stretches according to the shape of the mold was considered good.
(6)寸法精度
底面から10mmの深さ位置で円周上に均等間隔をおいて4点の厚みを計測し、平均厚み(t1)を求めた。
同様に底面から20mmの深さ位置で円周上に均等間隔をおいて4点の厚みを計測し、平均厚み(t2)を求めた。t1/t2を算出して、その比が1.0に近いほど、寸法精度が良いことを意味する。
なお、成形品の寸法は、マイクロメータ、ノギス、Rゲージを用いて測定した。
(6) Dimensional accuracy At the depth position of 10 mm from the bottom surface, the thickness of four points was measured at equal intervals on the circumference, and the average thickness (t1) was obtained.
Similarly, the thickness of four points was measured at equal intervals on the circumference at a depth of 20 mm from the bottom, and the average thickness (t2) was obtained. When t1 / t2 is calculated, the closer the ratio is to 1.0, the better the dimensional accuracy.
In addition, the dimension of the molded article was measured using a micrometer, a caliper, and an R gauge.
(7)結晶化度
比重法により算出した。
(7) Crystallinity Calculated by specific gravity method.
実施例1〜5、比較例1〜4
(シートの成形工程)
池貝社製のVS40-25押出機(スクリュー径40mm)にコートハンガーダイ(Tダイ:リップ300mm幅)を取り付けたものを用い、表1に示すPPS(ポリプラスチックス(株)製)を溶融押出した。
押出後、外径200mmの冷却ロール(ロール温度150℃)にて冷却して、厚み0.6mmのシートを得た。
Examples 1-5, Comparative Examples 1-4
(Sheet forming process)
Melting extrusion of PPS (manufactured by Polyplastics Co., Ltd.) shown in Table 1 using a VS40-25 extruder (screw diameter 40 mm) made by Ikegai with a coat hanger die (T die: lip 300 mm width). did.
After the extrusion, the sheet was cooled with a cooling roll having an outer diameter of 200 mm (roll temperature 150 ° C.) to obtain a sheet having a thickness of 0.6 mm.
(予熱工程)
真空成形機(浅野研究所製 真空圧空成機 FK−0431−10)内にて、シート(250mm×250mm)が表1に示す温度になるまで予熱した。
(Preheating process)
In a vacuum forming machine (vacuum pressure air forming machine FK-0431-10 manufactured by Asano Laboratory), the sheet (250 mm × 250 mm) was preheated until the temperature shown in Table 1 was reached.
(成形工程)
真空成形用の金型として、有底円筒状の金型(雌型)(内径30mm×深さ30mm,底面はR3mmの丸みを有する;底の8箇所に真空吸引孔を有している)を用いた。
予熱されたシートを金型上に移動させ、凸部を有する円筒状プラグ(内径26mm,底面はR3mmの丸みを有する)で所定温度に維持された金型内に押し込み、金型内で吸引してコップ状の薄肉深絞り成形品(開口部内径30mm、底部内径30mm、深さ30mm)を得た。なお、成形圧力は200kPa、プラグ温度は150℃、成形後の冷却時間は15〜60秒であった。
(Molding process)
As a mold for vacuum forming, a bottomed cylindrical mold (female mold) (inner diameter 30 mm x depth 30 mm, bottom has R3 mm roundness; has 8 vacuum suction holes at the bottom) Using.
The preheated sheet is moved onto the mold, and is pushed into the mold maintained at a predetermined temperature with a cylindrical plug having a convex portion (inner diameter 26 mm, bottom surface has a rounded R3 mm), and sucked in the mold. A cup-shaped thin deep-drawn molded product (opening inner diameter 30 mm, bottom inner diameter 30 mm, depth 30 mm) was obtained. The molding pressure was 200 kPa, the plug temperature was 150 ° C., and the cooling time after molding was 15 to 60 seconds.
比較例5
(シートの成形工程及び予熱工程)
実施例1〜5と同様に溶融押出し、厚み0.6mmのシートを得た。その後、実施例1〜5と同様に予熱した。
Comparative Example 5
(Sheet forming process and preheating process)
Melt extrusion was carried out in the same manner as in Examples 1 to 5 to obtain a sheet having a thickness of 0.6 mm. Then, it preheated similarly to Examples 1-5.
(成形工程)
真空成形用の金型として、有底円筒状の金型(雌型)(内径30mm×深さ15mm,底面はR3mmの丸みを有する;底の8箇所に真空吸引孔を有している)を用いた。(比較例として深絞りではない金型を使用した。)
予熱されたシートを金型上に移動させ、凸部を有する円筒状プラグ(内径26mm,底面はR3mmの丸みを有する)で所定温度に維持された金型内に押し込み、金型内で吸引してコップ状の薄肉深絞り成形品(開口部内径30mm、底部内径30mm、深さ15mm)を得た。なお、成形圧力は200kPa、プラグ温度は150℃、成形後の冷却時間は60秒であった。
(Molding process)
As a mold for vacuum forming, a bottomed cylindrical mold (female mold) (inner diameter 30 mm x depth 15 mm, bottom surface has rounded R3 mm; has 8 vacuum suction holes at the bottom) Using. (As a comparative example, a non-deep die was used.)
The preheated sheet is moved onto the mold, and is pushed into the mold maintained at a predetermined temperature with a cylindrical plug having a convex portion (inner diameter 26 mm, bottom surface has a rounded R3 mm), and sucked in the mold. A cup-shaped thin-walled deep-drawn molded product (opening inner diameter 30 mm, bottom inner diameter 30 mm, depth 15 mm) was obtained. The molding pressure was 200 kPa, the plug temperature was 150 ° C., and the cooling time after molding was 60 seconds.
比較例6
(シートの成形工程及び予熱工程)
実施例1〜5と同様に溶融押出し、厚み0.6mmのシートを得た。その後、実施例1〜5と同様に予熱した。
Comparative Example 6
(Sheet forming process and preheating process)
Melt extrusion was carried out in the same manner as in Examples 1 to 5 to obtain a sheet having a thickness of 0.6 mm. Then, it preheated similarly to Examples 1-5.
真空成形用の金型として、有底円筒状の金型(雌型)(開口部内径30mm、底部内径21mm×深さ30mm,底面はR3mmの丸みを有する;底の8箇所に真空吸引孔を有している)を用いた。(比較例として深絞りではない金型を使用した。)
予熱されたシートを金型上に移動させ、凸部を有する円錐台状プラグ(内径26mmから17mm,底面はR3mmの丸みを有する)で所定温度に維持された金型内に押し込み、金型内で吸引してコップ状の薄肉深絞り成形品(開口部内径30mm、底部内径21mm、深さ30mm)を得た。なお、成形圧力は200kPa、プラグ温度は150℃、成形後の冷却時間は60秒であった。
比較例4〜6から明らかなとおり、シートの予熱温度が低いと、本発明の要件(a)、(b)を満たさない、深絞りではない薄肉成形品は成形できたが(比較例5、6)、本発明の要件(a)、(b)を満たす深絞り成形品は成形できなかった(比較例4)。
As a mold for vacuum forming, a bottomed cylindrical mold (female) (opening inner diameter 30mm, bottom inner diameter 21mm x depth 30mm, bottom has R3mm roundness; 8 vacuum suction holes at the bottom Have). (As a comparative example, a non-deep die was used.)
Move the preheated sheet onto the mold and push it into the mold maintained at the specified temperature with a truncated cone-shaped plug (with an inner diameter of 26mm to 17mm and a bottom of R3mm rounded). To obtain a cup-shaped thin-walled deep-drawn molded product (opening inner diameter 30 mm, bottom inner diameter 21 mm, depth 30 mm). The molding pressure was 200 kPa, the plug temperature was 150 ° C., and the cooling time after molding was 60 seconds.
As is clear from Comparative Examples 4 to 6, when the preheating temperature of the sheet was low, a thin molded article that did not satisfy the requirements (a) and (b) of the present invention and was not deep drawn could be molded (Comparative Example 5, 6) A deep-drawn molded product satisfying the requirements (a) and (b) of the present invention could not be molded (Comparative Example 4).
Claims (4)
前記PPSが、溶融粘度(測定条件:温度310℃,剪断速度1200s-1)が350〜1000Pa・sのものであり、
下記の(a)〜(d)を満たすものである薄肉深絞り成形品。
(a)前記成形品の開口部面積に対する底部面積の比が0.7以上の範囲
(b)前記成形品の開口部形状の長辺又は内径に対する成形品の深さの比(絞り比)が0.8以上の範囲
(c)前記成形品の平面部(角部を除く意味である)の異なる2つの高さにおける平均厚みt1及びt2の比(t1/t2)が0.8〜1.2の範囲
(d)PPSの結晶化度が23〜33% It is a thin-walled deep-drawn molded product formed of a resin composition containing polyphenylene sulfide (PPS), vacuum-formed or pressure-formed,
The PPS has a melt viscosity (measurement conditions: temperature 310 ° C., shear rate 1200 s −1 ) of 350 to 1000 Pa · s,
A thin-walled deep-drawn molded product that satisfies the following (a) to (d).
(A) The ratio of the bottom area to the opening area of the molded product is 0.7 or more. (B) The ratio (drawing ratio) of the depth of the molded product to the long side or the inner diameter of the opening shape of the molded product. The range of 0.8 or more (c) The ratio (t1 / t2) of the average thicknesses t1 and t2 at two different heights of the flat part (meaning excluding corners) of the molded product is 0.8 to 1. Range of 2 (d) PPS crystallinity is 23-33%
溶融粘度が350〜1000Pa・sであるポリフェニレンスルフィド(PPS)を含む樹脂組成物からなるシートを得る工程、
前工程で得られたシートに対して、昇温結晶化温度(Tcc)+50℃から融点(Tm)−10℃までの温度範囲で維持して予熱処理する工程、
予熱処理したシートを昇温結晶化温度(Tcc)以上の温度から融点(Tm)−10℃までの温度範囲で維持した金型に入れた後、真空成形又は圧空成形する工程、
を有している薄肉深絞り成形品の製造方法。 A method for producing a thin-walled deep-drawn product according to claim 1,
A step of obtaining a sheet comprising a resin composition containing polyphenylene sulfide (PPS) having a melt viscosity of 350 to 1000 Pa · s,
A step of pre-heat-treating the sheet obtained in the previous step while maintaining it in a temperature range from a temperature rising crystallization temperature (Tcc) + 50 ° C. to a melting point (Tm) −10 ° C.,
A step in which the preheated sheet is placed in a mold maintained in a temperature range from a temperature equal to or higher than a temperature-rising crystallization temperature (Tcc) to a melting point (Tm) −10 ° C., and then subjected to vacuum forming or pressure forming.
A method for producing a thin-walled deep-drawn molded product having
前記真空成形又は圧空成形する工程における金型温度が、昇温結晶化温度(Tcc)+5℃以上から融点(Tm)−20℃までの温度範囲である、請求項3記載の薄肉深絞り成形品の製造方法。 PPS used in the step of obtaining the sheet has a melt viscosity of 450 to 600 Pa · s,
The thin-walled deep-drawn molded product according to claim 3, wherein a mold temperature in the vacuum forming or pressure forming step is a temperature range from a temperature rising crystallization temperature (Tcc) + 5 ° C or higher to a melting point (Tm) -20 ° C. Manufacturing method.
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