JPH08118486A - Molding apparatus for thick hollow-molded form, and molding method using the same - Google Patents
Molding apparatus for thick hollow-molded form, and molding method using the sameInfo
- Publication number
- JPH08118486A JPH08118486A JP6287239A JP28723994A JPH08118486A JP H08118486 A JPH08118486 A JP H08118486A JP 6287239 A JP6287239 A JP 6287239A JP 28723994 A JP28723994 A JP 28723994A JP H08118486 A JPH08118486 A JP H08118486A
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- Prior art keywords
- mold
- molding
- thick
- hollow
- male
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、繊維補強合成樹脂製の
厚肉中空成形体の成形方法に関し、特に、内圧加圧法に
よる厚肉中空成形体の成形に好適な成形装置及び成形方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a thick hollow molded article made of fiber reinforced synthetic resin, and more particularly to a molding apparatus and a molding method suitable for molding a thick hollow molded article by an internal pressure pressing method.
【０００２】[0002]
【従来技術の説明】従来から繊維補強合成樹脂製厚肉中
空成形体の成形方法には外圧法と内圧法がある。外圧法
とは、例えば、補強繊維織物に熱可塑性樹脂を含浸させ
たシートを、成形しようとする厚肉中空成形体の内径に
ほぼ等しい外径の鉄芯に所定回数巻き、その外周に熱収
縮テープを巻き付け、その後、樹脂の融点近傍まで加熱
し、テープの熱収縮力を利用してシートの層間を溶融接
着させる。その後、常温まで冷却し、脱芯して厚肉中空
成形体を得る方法である。内圧法には、２通りの方法が
あって、１つは、含浸シートを渦巻状に巻き回して筒状
にし、これを円筒状金型内に挿入し、次にシートの中空
部にシリコンチューブ（耐熱性あり）を挿入した後、融
点近傍まで加熱し、チューブ内に圧縮空気を封入し、シ
ートを内側から加圧し、シートの層間を溶融接着させ
る。その後、常温まで冷却し、シリコンチューブを引き
抜くと共に円筒状金型から脱型して厚肉中空成形体を得
る方法がある。もう１つの方法は、前述のシリコンチュ
ーブの代わりに熱膨張率の大きい棒状の中子を用い、樹
脂の融点近傍まで加熱して中子の熱膨張による押圧力で
シートを内側から加圧し、層間を溶融接着させ、その
後、常温まで冷却、中子をシートの中空部から引き抜く
と共に円筒状金型から脱型して厚肉中空成形体を得る方
法である。2. Description of the Related Art Conventionally, there are an external pressure method and an internal pressure method as a method of molding a thick hollow molded article made of fiber reinforced synthetic resin. The external pressure method is, for example, a sheet in which a reinforced fiber woven fabric is impregnated with a thermoplastic resin, is wound a predetermined number of times around an iron core having an outer diameter substantially equal to the inner diameter of the thick hollow molding to be molded, and heat shrinks around the outer circumference. The tape is wound and then heated to near the melting point of the resin, and the heat shrinkage force of the tape is used to melt and bond the layers of the sheet. Then, it is a method of cooling to room temperature and decoreing to obtain a thick hollow molded body. There are two methods for the internal pressure method. One is to wind the impregnated sheet in a spiral shape into a tubular shape, insert this into a cylindrical mold, and then insert a silicon tube into the hollow portion of the sheet. After (heat resistant) is inserted, it is heated to near the melting point, compressed air is enclosed in the tube, the sheet is pressed from the inside, and the layers of the sheet are melt-bonded. After that, there is a method of cooling to room temperature, pulling out the silicon tube and releasing from the cylindrical mold to obtain a thick hollow molded body. Another method is to use a rod-shaped core with a large coefficient of thermal expansion instead of the above-mentioned silicon tube, heat it to near the melting point of the resin, press the sheet from the inside with the pressing force due to the thermal expansion of the core, and Is melt-bonded, then cooled to room temperature, the core is pulled out from the hollow portion of the sheet and released from the cylindrical mold to obtain a thick hollow molded body.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、繊維補
強熱可塑性樹脂製厚肉中空成形体の外圧成形方法は、外
周に熱収縮テープを巻くために外観が悪く、かつ、テー
プの巻き締め強さや巻くピッチにより加圧力が不安定で
あるため、部分的に外径が異なる場合がある。また、成
形後テープを剥がす必要があり、手間がかかるなどの問
題がある。一方、内圧成形法は、加熱時のシリコンチュ
ーブのガス漏れがあり、加圧力が安定せず、そのために
圧力不足でシートの層間が融着不良になるという問題が
ある。また、熱膨張率の大きい棒状の中子を用いる方法
は、中子の耐久性が劣るため、１本で数回しか使用でき
ず、中子の高価なこともありコスト高の原因になる。
従って、本発明は、繊維補強合成樹脂製厚肉中空成形体
の内圧成形法として、厚肉中空成形体の外観が良く、厚
さの均一度に優れ、また、成形作業が簡単でコストの安
い成形方法の提供を目的とする。However, the external pressure molding method for a thick hollow molded article made of a fiber reinforced thermoplastic resin has a poor appearance because a heat shrinkable tape is wound around the outer periphery thereof, and the winding strength and the winding strength of the tape are increased. Since the pressing force is unstable depending on the pitch, the outer diameter may be partially different. In addition, it is necessary to peel off the tape after molding, which is troublesome. On the other hand, the internal pressure molding method has a problem that gas pressure leaks from the silicon tube at the time of heating and the applied pressure is not stable, which results in insufficient fusion between the sheets due to insufficient pressure. Further, the method of using a rod-shaped core having a large coefficient of thermal expansion is inferior in durability of the core, so that one core can be used only several times, and the core is expensive, which causes a high cost.
Therefore, the present invention is an internal pressure molding method for a fiber-reinforced synthetic resin thick hollow molded article, in which the thick hollow molded article has a good appearance and excellent thickness uniformity, and the molding operation is simple and inexpensive. The purpose is to provide a molding method.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意検討の結果、円筒状外形を有し、
かつ、垂直方向に１本の割溝を有する割り子構造である
内金型の円筒状外面に、成形用基材を巻き付け、厚肉中
空成形体の外径にほぼ等しい内径を有する中空外金型に
挿入し、次いで、組合わされた内及び外金型を加熱し、
加熱と同時に、または加熱後に内金型を内金型の半径方
向のほぼ等方向に機械的力により拡張せしめ、成形用基
材を一体化させる厚肉中空成形体の成形方法により、ま
た、厚肉中空成形体の外径にほぼ等しい内径を有する中
空外金型と、該中空外金型に挿入される内金型が肉厚円
筒状で、内壁が上に開いたテーパーを有し、かつ、垂直
方向に１本の割溝を有する割り子構造であり、前記内金
型のテーパー部に接して挿入可能な金属製の栽頭円錐状
雄型が組み合わされており、該栽頭円錐状雄型は前記内
金型と組み合わされた状態で下部に空間を有しており、
前記中空外金型は固定及び取り外し可能な金属製蓋体を
有し、該蓋体は、栽頭円錐状雄型の位置にボルトのねじ
込み可能なねじ穴を有する厚肉中空成形体用成形装置を
用いることにより前記課題の解決が可能であることを見
出だした。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have a cylindrical outer shape,
In addition, a hollow outer metal having an inner diameter substantially equal to the outer diameter of the thick hollow molded body is obtained by winding a molding base material around the cylindrical outer surface of an inner mold having a splitting structure having one split groove in the vertical direction. Insert into the mold, then heat the combined inner and outer molds,
Simultaneously with or after heating, the inner mold is expanded by mechanical force in the radial direction of the inner mold in a substantially equal direction, and the molding base material is integrated to form a thick hollow molded body. A hollow outer mold having an inner diameter substantially equal to the outer diameter of the hollow body, and an inner mold to be inserted into the hollow outer mold having a thick cylindrical shape, and an inner wall having a taper opened upward, and , A splitting structure having one split groove in the vertical direction, in which a male frustoconical male die insertable in contact with the tapered portion of the inner die is combined, The male mold has a space at the bottom in a state of being combined with the inner mold,
The hollow outer mold has a metal lid that can be fixed and removed, and the lid has a screw hole into which a bolt can be screwed at a position of a male cone-shaped mold. It has been found that the above problem can be solved by using.
【０００５】更に、本発明の成形方法及び成形装置につ
いて詳細に説明する。まず、成形方法の前に成形装置に
ついて説明する。本発明の成形装置の概略は、図１及び
図２に示される。図１は、本発明成形装置の金属製蓋体
を外した状態での平面図であり、図２は、図１のＡ−Ａ
´線での金属製蓋体を取り付けた状態での断面図であ
る。図１、図２において、１は本発明の成形装置を示
す。２は中空外金型、３は内金型、４は金属製の栽頭円
錐状雄型をそれぞれ示し、また、７は金属製蓋体を示
す。中空外金型２は、底部を有する円筒状の形状をして
おり、その内径は厚肉中空成形体の外径にほぼ等しく、
上面に少なくとも２個の金属製蓋体７を固定するための
ねじ穴１０を有している。内金型３は、肉厚円筒状で、
垂直方向に一本の割溝６を有する割り子構造で、かつ、
内壁が上に開いたテーパーを有している。成形用基材５
は、内金型３の外側に必要な層数だけ巻き付けられる。
従って内金型３の外径は、外金型２の内径と成形用基材
の巻き厚及び中空成形体の内径を考慮して決められる。
また、内金型３の内壁のテーパーの角度は３〜１０度程
度あれば良いが特にこの範囲に限定されるものではな
い。割溝の幅については、０．５〜５ｍｍ程度あれば良
い。この幅は０でも良いが加工上の問題があるため前記
した程度の幅があれば良い。Further, the molding method and molding apparatus of the present invention will be described in detail. First, the molding apparatus will be described before the molding method. The outline of the molding apparatus of the present invention is shown in FIGS. FIG. 1 is a plan view of the molding apparatus of the present invention with a metallic lid removed, and FIG.
It is sectional drawing in the state which attached the metallic lid body by the line. 1 and 2, reference numeral 1 indicates a molding apparatus of the present invention. 2 is a hollow outer mold, 3 is an inner mold, 4 is a metal frustoconical male mold, and 7 is a metal lid. The hollow outer mold 2 has a cylindrical shape having a bottom portion, and the inner diameter thereof is substantially equal to the outer diameter of the thick hollow molded body,
The upper surface has screw holes 10 for fixing at least two metal lids 7. The inner mold 3 has a thick-walled cylindrical shape,
A splitting structure having one split groove 6 in the vertical direction, and
The inner wall has a taper that opens upward. Molding substrate 5
Are wound on the outer side of the inner mold 3 by the required number of layers.
Therefore, the outer diameter of the inner mold 3 is determined in consideration of the inner diameter of the outer mold 2, the winding thickness of the molding substrate, and the inner diameter of the hollow molded body.
The taper angle of the inner wall of the inner mold 3 may be about 3 to 10 degrees, but is not particularly limited to this range. The width of the split groove may be about 0.5 to 5 mm. This width may be 0, but since there is a problem in processing, it is sufficient if the width is within the above range.
【０００６】金属製の栽頭円錐状雄型４は、内金型３の
内壁テーパー部に接して挿入される。従って、円錐の角
度は金型３のテーパー部の角度と補角の関係にある。図
１、図２においては、雄型４は中空部１３を有するよう
になっているが、この中空部１３はなくても良い。た
だ、成形用基材を加熱する場合にヒーターなどをこの部
分に入れることができるためあった方が望ましい。本発
明の成形装置は、この栽頭円錐状雄型４を機械的力によ
り内金型３のテーパー部に押し込み、内金型３を割溝６
の部分を拡張させることにより、内金型３の外側に巻き
付けられた成形用基材に内圧をかけ成形しようとするも
のである。従って、栽頭円錐状雄型４は最初に挿入され
た状態で、外金型２の底部との間に図２に示すように一
定の空間を有していることが必要である。この空間の間
隔は、図３に示すように、下端部の外径がｄ、テーパー
角度がθの栽頭円錐状雄型を最初に外径Ｄを有する内金
型にセットした位置をの位置とし、雄型を押し込み成
形に必要な内圧を賦課する位置まで内金型を拡張させた
位置をの位置とし、この時の内金型の外径をＤ＋αと
すると、図３の（ロ）に示す３角形において、 ｔａｎθ＝α／２／Ｈ （Ｈはの位置との位置間の
距離） これより Ｈ＝α／（２×ｔａｎθ） ……（１）式 従って、雄型を内金型に最初にセットした状態で雄型の
下部に少なくとも（１）式で示されるＨより大きい値の
空間を設ける必要がある。また、内金型の割溝の幅をＢ
とし、拡張後の幅をＢ´とすると、図４に示すように Ｂ´＝Ｂ＋（外周の変位量） ＝Ｂ＋｛π（Ｄ＋α）−πＤ｝ ＝Ｂ＋πα （１）式より Ｂ´＝Ｂ＋２×π×Ｈ×ｔａｎθ ……（２）式 拡張後の割溝の幅Ｂ´は（２）式で示される。The male frustoconical male die 4 is inserted in contact with the inner wall tapered portion of the inner die 3. Therefore, the angle of the cone is complementary to the angle of the taper portion of the mold 3. 1 and 2, the male mold 4 has the hollow portion 13, but the hollow portion 13 may be omitted. However, it is preferable to have a heater or the like in this portion when heating the molding substrate. In the molding apparatus of the present invention, the truncated cone-shaped male mold 4 is pushed into the taper portion of the inner mold 3 by a mechanical force, and the inner mold 3 is divided into the split grooves 6.
By expanding the portion (1), the molding base material wound around the outer side of the inner mold 3 is subjected to internal pressure for molding. Therefore, it is necessary that the frustoconical male mold 4 has a certain space between it and the bottom of the outer mold 2 as shown in FIG. As shown in FIG. 3, the space is located at a position where a frusto-conical male die having an outer diameter d at the lower end and a taper angle θ is first set in an inner die having an outer diameter D. Then, the position where the inner mold is expanded to the position where the male mold is pushed in and the internal pressure required for molding is set to is the position, and the outer diameter of the inner mold at this time is D + α. In the triangle shown, tan θ = α / 2 / H (H is the distance between the position and the position of) From this, H = α / (2 × tan θ) Equation (1) Therefore, the male die is the inner die In the first set state, it is necessary to provide at least a space having a value larger than H represented by the formula (1) in the lower part of the male mold. In addition, the width of the split groove of the inner die is B
Assuming that the width after expansion is B ′, as shown in FIG. 4, B ′ = B + (amount of displacement of outer circumference) = B + {π (D + α) −πD} = B + πα From the equation (1), B ′ = B + 2 × π × H × tan θ (Equation (2)) The width B ′ of the split groove after expansion is expressed by Equation (2).
【０００７】金属製蓋体７は、固定用のねじ穴１０、及
び栽頭円錐状雄型４に押圧力を与えるためのボルトねじ
込み用穴１１を有する。セットされた状態で蓋体７は固
定用ボルト８により外金型の上部に固定される。更に押
し込み用ボルト９がねじ穴１１に捩じ込まれる。押し込
み用ボルト９をねじ込むことにより雄型４は、下方に押
し込まれる。それにともない、内金型に半径方向の力が
作用し、割溝がその力に応じて広がり、内金型全体が拡
張するような形になる。その結果、巻き付けられていた
成形用基材５に内圧が付加されることになる。押し込み
用ボルト９のねじ込みは、成形装置の加熱と同時におこ
なっても良いし、加熱後におこなっても良い、また、一
定温度に加熱後加熱を続けながらねじ込みをおこなって
も良い。本発明の成形装置の加熱は、加熱炉にいれて加
熱することも可能であるが、図２に示すように、外金型
２の周囲に発熱体１４を巻き付け加熱することも可能で
ある。この場合は、雄型４の中空部１３に発熱体を取り
付けることもできる。また、内金型３に直接成形用基材
５を巻き付けると、割溝６に樹脂が流れるため、内金型
の表面に薄い金属製のシート１２を２，３層巻き付け、
その上に成形用基材５を巻き付けることもできる。本発
明の成形装置の材質は、炭素鋼（例えばＳＳ４１，Ｓ４
５Ｃ）やステンレス鋼、硬質アルミなどの金属材料が使
用できる。The metal lid 7 has a fixing screw hole 10 and a bolt screwing hole 11 for applying a pressing force to the frustoconical male mold 4. In the set state, the lid 7 is fixed to the upper part of the outer mold by the fixing bolt 8. Further, the pushing bolt 9 is screwed into the screw hole 11. The male mold 4 is pushed downward by screwing the push-in bolt 9. Along with this, a force in the radial direction acts on the inner die, the split groove expands in accordance with the force, and the entire inner die expands. As a result, the internal pressure is applied to the wound molding base material 5. The pushing bolt 9 may be screwed in at the same time as the heating of the molding apparatus, may be performed after the heating, or may be screwed while continuing heating after heating to a constant temperature. The molding apparatus of the present invention can be heated by putting it in a heating furnace, but as shown in FIG. 2, it is also possible to wind the heating element 14 around the outer mold 2 to heat it. In this case, a heating element can be attached to the hollow portion 13 of the male mold 4. Further, when the molding base material 5 is directly wound around the inner mold 3, the resin flows in the split grooves 6, so that a thin metal sheet 12 is wound on the surface of the inner mold in two or three layers.
The molding base material 5 can be wound around it. The material of the molding apparatus of the present invention is carbon steel (for example, SS41, S4
Metal materials such as 5C), stainless steel, and hard aluminum can be used.
【０００８】次に本発明の成形方法について述べる。ま
ず、円筒状外形を有し、かつ、垂直方向に１本の割溝を
有する割り子構造である内金型の円筒状外面に、成形用
基材を巻き付ける。この成形用基材を巻き付けた内金型
を厚肉中空成形体の外径にほぼ等しい内径を有する中空
外金型に挿入し、次いで、成形用基材を間に有する内外
金型の組み合わせを加熱する。この加熱と同時、または
後で、内金型を半径方向のほぼ等方向に機械的力により
拡張せしめ、成形用基材に圧力と熱を与え、補強繊維へ
の樹脂の含浸脱泡ををおこない、熱硬化性樹脂の場合
は、硬化反応を完了させ厚肉中空成形体の成形を行うも
のである。本発明の成形方法において、内金型を半径方
向のほぼ等方向に拡張せしめる機械的力については、前
述したような内金型の内側を雄雌構造の組み合わせに
し、雄型の挿入により内金型を拡張せしめることができ
る。Next, the molding method of the present invention will be described. First, the molding base material is wound around the cylindrical outer surface of the inner mold having a cylindrical outer shape and a split structure having one split groove in the vertical direction. The inner die wound with this molding base material is inserted into a hollow outer die having an inner diameter substantially equal to the outer diameter of the thick hollow molding, and then a combination of inner and outer dies having a molding base material in between is formed. To heat. Simultaneously with or after this heating, the inner mold is expanded by mechanical force in almost the same direction in the radial direction, and pressure and heat are applied to the molding base material to impregnate and defoam the reinforcing fibers with the resin. In the case of a thermosetting resin, the curing reaction is completed to form a thick hollow molded article. In the molding method of the present invention, regarding the mechanical force for expanding the inner mold in the substantially equal direction in the radial direction, the inside of the inner mold as described above is a combination of male and female structures, and the inner mold is inserted by inserting the male mold. The type can be extended.
【０００９】本発明の厚肉中空成形体の成形方法、及び
成形装置が使用できる成形用基材は、マトリックス樹脂
が熱可塑性樹脂の場合は、熱可塑性樹脂繊維と補強繊維
からなる混織織物や交織織物、一方向織物などが、ま
た、熱可塑性樹脂繊維と補強繊維の短繊維からなるマッ
ト状体や熱可塑性樹脂を含浸させた補強繊維織物などが
使用できる。マトリックス樹脂が熱硬化性樹脂の場合
は、補強繊維織物やマットにポリエステル樹脂やエポキ
シ樹脂などの熱硬化性樹脂を含浸させ半硬化状態にした
プリプレグなどが使用できる。また、本発明の成形方
法、及び成形装置により成形される中空成形体の肉厚
は、０．２〜１０ｍｍ程度の範囲のものが可能である。When the matrix resin is a thermoplastic resin, the base material for molding which can be used in the method for molding a thick hollow molded article and the molding apparatus of the present invention is a mixed woven fabric composed of thermoplastic resin fibers and reinforcing fibers. A mixed woven fabric, a unidirectional woven fabric, and the like, a mat-like body made of thermoplastic resin fibers and reinforcing fiber short fibers, and a reinforced fiber woven fabric impregnated with a thermoplastic resin can be used. When the matrix resin is a thermosetting resin, a prepreg which is semi-cured by impregnating a reinforcing fiber woven fabric or mat with a thermosetting resin such as polyester resin or epoxy resin can be used. Moreover, the wall thickness of the hollow molded body molded by the molding method and the molding apparatus of the present invention can be in the range of about 0.2 to 10 mm.
【００１０】[0010]
【作用】本発明の成形方法及び成形装置によれば、内金
型３をその半径方向のほぼ等方向に拡張させる力が働く
ため、内金型３の外周に巻き付けられ、外金型の内側に
挿入された成形用基材には安定した内圧が加えられるこ
とになる。従って、均一な厚さをもった、外観の良い中
空成形体が簡単な方法装置で得ることができる。According to the molding method and the molding apparatus of the present invention, since a force that expands the inner mold 3 in substantially the same radial direction acts, it is wound around the outer circumference of the inner mold 3 and inside the outer mold. A stable internal pressure is applied to the molding base material inserted in. Therefore, a hollow molded article having a uniform thickness and good appearance can be obtained by a simple method device.
【００１１】[0011]
【実施例】 成形用基材…ガラス繊維織物にポリアミド（ナイロ
ン６）を含浸させた厚さ０．２ｍｍの含浸シートを用い
た。この含浸シートを用いて厚さ１０ｍｍの中空成形体
を成形した。 成形装置…図１，図２に示す形状で下記仕様の成形
装置を用いた。 外金型…内径が１２０ｍｍ、円筒部内側の高さが１８０
ｍｍ、円筒部の肉厚が５ｍｍで、材質は炭素鋼（ＳＳ４
１）製である。円筒部外周に加熱用ヒーターを有する。 内金型…外径が９８ｍｍ、高さが１００ｍｍで、内壁テ
ーパー部の上部の内径が８０ｍｍ、下部の内径が７０ｍ
ｍ、テーパー部の角度が３度で、割溝幅が５ｍｍ、材質
は炭素鋼（ＳＳ４１）製である。 栽頭円錐状雄型…上部外径が８３ｍｍ、下部外径が７３
ｍｍ、高さが１００ｍｍ、テーパー部の角度が３度、材
質は炭素鋼（ＳＳ４１）製である。セットした状態で雄
型下部と外金型底部との間隔は３０ｍｍである。 成形…内金型及び外金型の含浸シートの接する面に
離型剤を塗布。次いで内金型にシートを５０層巻き、外
金型の中にいれた。栽頭円錐状雄型を内金型のテーパー
部に挿入し、金属製蓋体を固定し、押し込み用ボルトを
セットした。押し込み用ボルトで雄型を若干押し込み、
後の加熱時にシートの巻崩れが起こらないようにした。
そして、外金型に装着してあるヒーターを加熱して、ナ
イロン６の融点近傍約２５０℃まで昇温し、その時点
で、雄型をゆっくり内金型のテーパー部に沿って押し込
み、内金型を半径方向に拡張させ、シート厚が１０ｍｍ
になるようにした。このように加熱した状態で、シート
の内側から機械的に圧力を加え、約１５分間保持した。
その後、その状態で常温まで冷却し、内金型を外し、中
空成形体を離型した。得られた中空成形体は、層間のボ
イドもなく、外観、特に表面の平滑性が良好であった。Examples Molding substrate: A 0.2 mm thick impregnated sheet obtained by impregnating a glass fiber woven fabric with polyamide (nylon 6) was used. A hollow molded body having a thickness of 10 mm was molded using this impregnated sheet. Molding apparatus ... A molding apparatus having the shape shown in FIGS. 1 and 2 and having the following specifications was used. Outer mold: Inner diameter is 120mm, height inside the cylinder is 180
mm, the wall thickness of the cylindrical portion is 5 mm, and the material is carbon steel (SS4
1) Made. A heater for heating is provided on the outer circumference of the cylindrical portion. Inner mold: outer diameter is 98mm, height is 100mm, inner diameter of the inner wall taper part is 80mm, lower part is 70m
m, the angle of the tapered portion is 3 degrees, the split groove width is 5 mm, and the material is carbon steel (SS41). Male head conical shape ... upper outer diameter is 83 mm, lower outer diameter is 73
mm, the height is 100 mm, the angle of the tapered portion is 3 degrees, and the material is carbon steel (SS41). The distance between the lower part of the male mold and the bottom of the outer mold in the set state is 30 mm. Molding ... Releasing agent is applied to the surfaces of the inner and outer molds that are in contact with the impregnated sheets. Then, 50 layers of the sheet were wound around the inner mold and placed in the outer mold. The conical male mold was inserted into the taper part of the inner mold, the metal lid was fixed, and the pushing bolt was set. Push in the male mold slightly with the push-in bolt,
The sheet did not collapse when heated later.
Then, the heater attached to the outer die is heated to raise the temperature to about 250 ° C. near the melting point of nylon 6, and at that time, the male die is slowly pushed along the tapered portion of the inner die to The mold is expanded in the radial direction and the sheet thickness is 10 mm
I tried to become. In this heated state, mechanical pressure was applied from the inside of the sheet, and the sheet was held for about 15 minutes.
Then, in that state, it was cooled to room temperature, the inner mold was removed, and the hollow molded body was released. The resulting hollow molded article had no voids between layers and had good appearance, particularly smoothness of the surface.
【００１２】＜比較例＞実施例と同じ含浸シートをマン
ドレル上に５０層巻き、内径が１２０ｍｍの円筒状金型
内に挿入した。次いで、マンドレルを抜き取り、代わり
にシリコンチューブを挿入する。その後２５０℃近辺ま
で昇温し、チューブ内に圧縮気体（窒素ガス；圧力１０
ｋｇ／ｃｍ2 ）を封入した。これによりシートを内側か
ら加圧し、シートの層間を溶融接着させた。その後冷却
し、シリコンチューブをシートの中空部から引き抜くと
共に、円筒状金型を除去することにより中空成形体を得
ようとしたが、圧縮気体のガス漏れが大きく、加圧力が
不足したために、シート層間の溶融接着が十分にでき
ず、特に最内層が剥がれるなど仕上がりが悪く、実施例
のような中空成形体が得られなかった。<Comparative Example> The same impregnated sheet as in Example was wound on a mandrel in 50 layers and inserted into a cylindrical mold having an inner diameter of 120 mm. The mandrel is then removed and a silicon tube is inserted in its place. Then, the temperature is raised to around 250 ° C., and compressed gas (nitrogen gas; pressure 10
(kg / cm 2 ) was enclosed. As a result, the sheet was pressed from the inside, and the layers of the sheet were melt-bonded. After cooling, the silicon tube was pulled out from the hollow part of the sheet, and it was tried to obtain a hollow molded body by removing the cylindrical mold, but the gas leakage of the compressed gas was large and the pressure was insufficient, so the sheet It was not possible to obtain a hollow molded article as in Examples, because the melt adhesion between layers could not be sufficiently performed and the innermost layer was peeled off, resulting in poor finish.
【００１３】[0013]
【発明の効果】本発明の成形装置は、特殊な形状の管体
状金型を用い、シートの内側から機械的力を加えること
により、安定した加圧力がえられ、外観、特に表面平滑
性が良好で、層間のボイドのない繊維補強合成樹脂中空
成形体が得られる。また、本発明の成形装置は、繰返し
使用可能であり、作業性も簡単であるため加工コストを
安くすることができる。INDUSTRIAL APPLICABILITY The molding apparatus of the present invention uses a tubular mold having a special shape, and a stable pressing force can be obtained by applying a mechanical force from the inside of the sheet, and the appearance, especially the surface smoothness. And a fiber-reinforced synthetic resin hollow molded product having no voids between layers can be obtained. Further, the molding apparatus of the present invention can be repeatedly used and the workability is simple, so that the processing cost can be reduced.
【図１】本発明の成形装置の蓋体を外した状態での平面
図FIG. 1 is a plan view of a molding apparatus of the present invention with a lid removed.
【図２】本発明の成形装置の断面図FIG. 2 is a sectional view of the molding apparatus of the present invention.
【図３】雄型下部に設ける空間距離を求めるための説明
図FIG. 3 is an explanatory diagram for obtaining a spatial distance provided in the lower part of the male mold.
【図４】拡張後の割溝幅を求めるための説明図FIG. 4 is an explanatory diagram for obtaining a split groove width after expansion.
１． 本発明の成形装置 ２． 外金型 ３． 内金型 ４． 栽頭円錐状雄型 ５． 成形用基材 ６． 内金型の割溝 ７． 金属製蓋体 ８． 固定用ボルト ９． 押込み用ボルト １０．固定用ねじ穴 １１．押込みボルト用ねじ穴 １２．金属製シート １３．雄型の中空部 １４．加熱用ヒーター 1. Molding apparatus of the present invention 2. Outer mold 3. Inner mold 4. Male head conical shape 5. Base material for molding 6. Inner mold split groove 7. Metal lid 8. Fixing bolt 9. Push-in bolt 10. Fixing screw hole 11. Screw hole for push-in bolt 12. Metal sheet 13. Male hollow part 14. Heater for heating
Claims (2)
本の割溝を有する割り子構造である内金型の円筒状外面
に、成形用基材を巻き付け、厚肉中空成形体の外径にほ
ぼ等しい内径を有する中空外金型に挿入し、次いで、組
合わされた内及び外金型を加熱し、加熱と同時に、また
は加熱後に内金型を内金型の半径方向のほぼ等方向に機
械的力により拡張せしめ、成形用基材を一体化させるこ
とを特徴とする厚肉中空成形体の成形方法。1. It has a cylindrical outer shape and is 1 in the vertical direction.
On the cylindrical outer surface of the inner mold, which is a split structure having a split groove of the book, the molding base material is wound, and inserted into a hollow outer mold having an inner diameter substantially equal to the outer diameter of the thick hollow molded body, and then , Heating the combined inner and outer molds, and at the same time as or after heating, the inner mold is expanded by mechanical force in substantially the same radial direction of the inner mold to integrate the molding base material. A method for forming a thick hollow molded article, comprising:
を有する中空外金型と、該中空外金型に挿入される内金
型が肉厚円筒状で、内壁が上に開いたテーパーを有し、
かつ、垂直方向に１本の割溝を有する割り子構造であ
り、前記内金型のテーパー部に接して挿入可能な金属製
の栽頭円錐状雄型が組み合わされており、該栽頭円錐状
雄型は前記内金型と組み合わされた状態で下部に空間を
有しており、また、前記中空外金型は固定及び取り外し
可能な金属製蓋体を有し、該蓋体は、前記栽頭円錐状雄
型の位置にボルトのねじ込み可能なねじ穴を有すること
を特徴とする厚肉中空成形体用成形装置。2. A hollow outer mold having an inner diameter substantially equal to the outer diameter of the thick hollow molded body, and an inner mold inserted into the hollow outer mold is a thick cylindrical shape, and an inner wall is opened upward. Has a taper,
Moreover, it is a splitting structure having one split groove in the vertical direction, and is combined with a male frustoconical male die that can be inserted in contact with the tapered portion of the inner die, The male mold has a space in the lower part in a state of being combined with the inner mold, and the hollow outer mold has a metal lid body that can be fixed and removed. A molding device for a thick hollow molded article, which has a screw hole into which a bolt can be screwed in at a position of a male cone-shaped head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6287239A JPH08118486A (en) | 1994-10-28 | 1994-10-28 | Molding apparatus for thick hollow-molded form, and molding method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6287239A JPH08118486A (en) | 1994-10-28 | 1994-10-28 | Molding apparatus for thick hollow-molded form, and molding method using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08118486A true JPH08118486A (en) | 1996-05-14 |
Family
ID=17714841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6287239A Pending JPH08118486A (en) | 1994-10-28 | 1994-10-28 | Molding apparatus for thick hollow-molded form, and molding method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08118486A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010042851A (en) * | 2008-08-18 | 2010-02-25 | Ashimori Ind Co Ltd | Method for manufacturing airtight bag having different diameters |
| CN110341209A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | A kind of compression-moulding methods of thermoplastic composite work shape reinforcement component |
-
1994
- 1994-10-28 JP JP6287239A patent/JPH08118486A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010042851A (en) * | 2008-08-18 | 2010-02-25 | Ashimori Ind Co Ltd | Method for manufacturing airtight bag having different diameters |
| CN110341209A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | A kind of compression-moulding methods of thermoplastic composite work shape reinforcement component |
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