JP2007185841A - Mold - Google Patents

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JP2007185841A
JP2007185841A JP2006005108A JP2006005108A JP2007185841A JP 2007185841 A JP2007185841 A JP 2007185841A JP 2006005108 A JP2006005108 A JP 2006005108A JP 2006005108 A JP2006005108 A JP 2006005108A JP 2007185841 A JP2007185841 A JP 2007185841A
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mold
cavity
slide
slide mold
resin
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JP4671869B2 (en
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Toshiki Miyaji
敏記 宮地
Tomoji Mori
智司 森
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DaikyoNishikawa Corp
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DaikyoNishikawa Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of a crack in the boundary part between a solid part and a molding body having an expanded layer on the periphery of the base part of the solid part. <P>SOLUTION: A fixed mold 35 having a slide mold housing part 35b corresponding to the mounting part 19 of a carrier plate 9, a movable mold 37 arranged forward/backward movably to face the fixed mold 35, and a slide mold 39 which is arranged forward/backward movably in the slide mold housing part 35b and in which a chamfering part 39c is formed in its tip peripheral edge part are set. When a fiber-containing thermoplastic resin R is injected/packed in a cavity 43, the slide mold 39 is positioned so that its chamfering part 39c protrudes into the cavity 43. When a skin layer 27 is formed in the vicinity of the molding surface of a mold 33 for the fiber-containing thermoplastic resin R in the cavity 43, to prevent the enlargement of the cavity volume of a place corresponding to the slide mold, the slide mold 39 is made to follow the retreat action in the cavity volume enlargement direction A1 of the movable mold 37 to an arrow A2 to be advanced further in the cavity 43. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、樹脂密度の高いスキン層が表面に形成されるとともに多数の空隙を有し上記スキン層に比べて樹脂密度の低い膨張層が内部に形成された成形体本体の一部に、上記膨張層を有することなく樹脂密度の高いソリッド層のみからなるソリッド部が形成されたパネル状の樹脂成形体をキャビティ内に繊維入り熱可塑性樹脂を射出充填して成形する成形型に関するものである。   In the present invention, a skin layer having a high resin density is formed on the surface, and there are a large number of voids. The present invention relates to a molding die for molding a panel-shaped resin molded body in which a solid portion made only of a solid layer having a high resin density without an expanded layer is formed by injection filling a thermoplastic resin containing fibers into a cavity.

特許文献1では、可動型を内部に収容した移動型と固定型とからなる成形型を型閉じした状態で、キャビティ内に繊維入り熱可塑性樹脂を射出充填し、該キャビティ内で上記繊維入り熱可塑性樹脂が固化する過程で、上記移動型内で可動型をキャビティ容積が拡大する方向に後退させて繊維入り熱可塑性樹脂を膨張させることにより、スキン層が表面に形成されるとともに多数の空隙を有する膨張層が内部に形成された樹脂成形体を成形する成形型が開示されている。そして、成形された樹脂成形体では、上記膨張層を樹脂成形体の内部全域に形成することにより軽量化を図っている。
特開平11−156881号公報(第3頁、図1)
In Patent Document 1, in a state in which a mold composed of a movable mold and a fixed mold accommodated in a movable mold is closed, a fiber-filled thermoplastic resin is injected and filled into a cavity, and the fiber-filled heat is filled in the cavity. In the process of solidifying the plastic resin, the movable mold in the movable mold is retracted in the direction in which the cavity volume is expanded to expand the fiber-containing thermoplastic resin, whereby a skin layer is formed on the surface and a large number of voids are formed. There is disclosed a mold that molds a resin molded body in which an expanded layer is formed. In the molded resin molded body, the expansion layer is formed over the entire interior of the resin molded body to reduce the weight.
Japanese Patent Laid-Open No. 11-156881 (page 3, FIG. 1)

ところで、上述の如く膨張層が内部全域に形成されている樹脂成形体に例えば部品を取り付ける場合、部品取付箇所を膨張層を有することなくソリッド層のみからなるソリッド部で形成して剛性を高めることが望ましい。そのやり方として、例えば、固定型に上記ソリッド部形成箇所に対応してスライド型を進退可能に配置し、繊維入り熱可塑性樹脂をキャビティ内に射出充填する際には、上記スライド型を先端成形面が上記キャビティ内に突出するように位置付け、上記キャビティ内に射出充填した繊維入り熱可塑性樹脂の成形型の成形面近傍にスキン層が生成された時点で、可動型をキャビティ容積拡大方向に後退させて繊維入り熱可塑性樹脂を膨張させるとともに、スライド型対応箇所のキャビティ容積が拡大しないように上記スライド型を可動型のキャビティ容積拡大方向への後退動作に追従させてキャビティ内にさらに進出させることにより、スキン層が表面に形成されるとともに膨張層が内部に形成された成形体本体にソリッド部を一体に形成することが考えられる。   By the way, when attaching a part, for example, to the resin molded body in which the expansion layer is formed in the entire inner area as described above, the part attachment portion is formed of a solid portion made of only the solid layer without having the expansion layer to increase rigidity. Is desirable. For example, when the slide mold is disposed on the fixed mold so as to be able to advance and retreat in correspondence with the solid portion forming portion, and the fiber-filled thermoplastic resin is injected and filled into the cavity, the slide mold is placed on the tip molding surface. Is positioned so as to protrude into the cavity, and when the skin layer is formed in the vicinity of the molding surface of the fiber-molded thermoplastic resin mold filled and injected into the cavity, the movable mold is retracted in the cavity volume expansion direction. By expanding the thermoplastic resin containing fibers and expanding the slide mold further into the cavity by following the retreating operation in the cavity volume expansion direction of the movable mold so that the cavity volume of the slide mold corresponding portion does not expand. The solid part is integrally formed on the molded body having the skin layer formed on the surface and the expansion layer formed inside. Door can be considered.

しかし、スライド型は硬い金属製や硬質樹脂製で成形面外周縁が鋭く角張っているため、上述のようにして樹脂成形体を成形すると、スライド型がキャビティ内にさらに進出しても、スライド型対応箇所の固化進行状態にある繊維入り熱可塑性樹脂はスライド型に押されないが、スライド型の鋭く角張った成形面外周縁がその周りの固化進行状態にある繊維入り熱可塑性樹脂に切り込んだ状態となり、その結果、ソリッド部とその基部周辺に膨張層を有する成形体本体との境界部に亀裂が発生し、成形された樹脂成形体の剛性強度が低下することになる。   However, since the slide mold is made of hard metal or hard resin and the outer peripheral edge of the molding surface is sharp and square, if the resin mold is molded as described above, even if the slide mold further advances into the cavity, the slide mold The thermoplastic resin containing fibers in the solidified progress state of the corresponding part is not pushed by the slide mold, but the sharp peripheral edge of the slide mold is cut into the fiber-containing thermoplastic resin in the solidifying progress state around it. As a result, a crack is generated at the boundary between the solid portion and the molded body having an expanded layer around the base portion, and the rigidity of the molded resin molded body is lowered.

この発明はかかる点に鑑みてなされたものであり、その目的とするところは、膨張成形された樹脂成形体において、ソリッド部とその基部周辺に膨張層を有する成形体本体との境界部に亀裂が発生しないようにすることである。   The present invention has been made in view of such a point, and an object of the present invention is to provide a crack in a boundary portion between a solid portion and a molded body having an expanded layer around the base portion in an expanded resin molded body. Is to prevent this from occurring.

上記の目的を達成するため、この発明は、スライド型の成形面側の先端形状を工夫したことを特徴とし、次のような解決手段を講じた。   In order to achieve the above object, the present invention is characterized in that the tip shape on the molding surface side of the slide mold is devised, and the following means for solving are taken.

具体的には、この発明は、樹脂密度の高いスキン層が表面に形成されるとともに多数の空隙を有し上記スキン層に比べて樹脂密度の低い膨張層が内部に形成された成形体本体の一部に、上記膨張層を有することなく樹脂密度の高いソリッド層のみからなるソリッド部が形成されたパネル状の樹脂成形体をキャビティ内に繊維入り熱可塑性樹脂を射出充填して成形する成形型を対象とし、次のような解決手段を講じた。   Specifically, the present invention provides a molded body having a skin layer having a high resin density formed on the surface and an expanded layer having a large number of voids and having a resin density lower than that of the skin layer. Mold that molds a panel-shaped resin molded body partly formed with a solid part consisting only of a solid layer having a high resin density without having the above-mentioned expanded layer by injection-filling a fiber-containing thermoplastic resin into the cavity The following solution was taken.

すなわち、請求項1に記載の発明は、上記樹脂成形体のソリッド部に対応するように成形面に開口するスライド型収容部を有する固定型と、該固定型に対して進退可能に対向配置された可動型と、上記固定型のスライド型収容部に進退可能に配置され先端に成形面が形成されるとともに先端外周縁部に面取部が形成されたスライド型とを備え、上記繊維入り熱可塑性樹脂をキャビティ内に射出充填する際には、上記スライド型を該スライド型の面取部が上記キャビティ内に突出するように位置付け、上記キャビティ内に射出充填した繊維入り熱可塑性樹脂の成形型の成形面近傍にスキン層が生成された時点で、上記可動型をキャビティ容積拡大方向に後退させて繊維入り熱可塑性樹脂を膨張させるとともに、スライド型対応箇所のキャビティ容積が拡大しないように上記スライド型を上記可動型のキャビティ容積拡大方向への後退動作に追従させてキャビティ内にさらに進出させるように構成されていることを特徴とする。   That is, the invention according to claim 1 is disposed so as to be opposed to the fixed mold having a slide mold accommodating portion that opens to the molding surface so as to correspond to the solid part of the resin molded body, and to be movable back and forth with respect to the fixed mold. A movable mold, and a slide mold that is movably disposed in the fixed-type slide-type housing portion and has a molding surface formed at the tip and a chamfered portion formed at the outer peripheral edge of the tip. When injection-filling the plastic resin into the cavity, the slide mold is positioned so that the chamfered portion of the slide mold protrudes into the cavity, and the mold for molding the fiber-filled thermoplastic resin injected and filled into the cavity When the skin layer is generated in the vicinity of the molding surface, the movable mold is retracted in the cavity volume expansion direction to expand the thermoplastic resin containing fibers and the cavity corresponding to the slide mold. The slide type so that the product does not expand, characterized in that it is configured to further advance into the cavity so as to follow the backward movement of the cavity volume expansion direction of the movable mold.

請求項2に記載の発明は、請求項1に記載の発明において、面取部は、スライド型外周縁から略均等幅をもって形成されるとともに、スライド型の軸心から面取部外周縁までの寸法(L1)と、上記軸心から面取部内周縁までの寸法(L2)との比(L2/L1)が0.4以上0.9以下に設定されていることを特徴とする。   The invention according to claim 2 is the invention according to claim 1, wherein the chamfered portion is formed with a substantially uniform width from the outer periphery of the slide mold, and from the axis of the slide mold to the outer periphery of the chamfer. A ratio (L2 / L1) between the dimension (L1) and the dimension (L2) from the axial center to the inner peripheral edge of the chamfered portion is set to 0.4 or more and 0.9 or less.

請求項1に係る発明によれば、成形体本体の表面にスキン層が形成されるとともに、内部に多数の空隙を有する膨張層が形成され、樹脂成形体の軽量化を図ることができる。また、ソリッド部が膨張層のない樹脂密度の高いソリッド層のみからなるため、ソリッド部の剛性強度、特に圧縮強度を高めることができる。さらに、射出充填の際キャビティ内に突出したスライド型が膨張成形時にさらにキャビティ内に進出するが、その際、スライド型には面取部が形成されているため、面取部が形成されていないものに比べてスライド型先端近傍の樹脂の射出充填量が多く、これにより膨張成形の際スライド型がさらに進出すると、まだ固化状態にないゲル状の樹脂の一部が拡大したキャビティ内に流出する。この際、ゲル状の樹脂は固化進行状態にある樹脂であり、硬い金属製や硬質樹脂製のスライド型に比べて格段に柔らかいため、ゲル状の樹脂がクッション(緩衝)作用をしてスライド型の先端周辺部の進出力は吸収緩和される。したがって、ソリッド部とその基部周辺に膨張層を有する成形体本体との境界部に亀裂が発生せず、成形された樹脂成形体の剛性強度を確保することができる。また、ソリッド部のスライド型対応箇所には開放口を有する凹部がスライド型の成形面によって形成され、その底面の上記成形面の面取部に対応する箇所では開放口側に向けてソリッド層の肉厚が厚くなるように形成されているため、ソリッド部の剛性強度、特に座屈強度をさらに向上させることができる。さらに、スライド型に面取部を形成するだけで、型構造を大幅に改変することなく簡素な型構造で上述の如き亀裂がなく優れた強度剛性を有する樹脂成形体を安価に成形することができる。   According to the first aspect of the present invention, the skin layer is formed on the surface of the molded body, and the expansion layer having a large number of voids is formed inside, whereby the weight of the resin molded body can be reduced. Further, since the solid portion is composed only of a solid layer having a high resin density without an expanded layer, the rigidity strength, particularly the compressive strength, of the solid portion can be increased. In addition, the slide mold that protrudes into the cavity during injection filling further advances into the cavity during expansion molding. At that time, the chamfered portion is formed on the slide mold, and thus the chamfered portion is not formed. The amount of resin injection and injection near the tip of the slide mold is larger than that of the slide mold. As a result, when the slide mold further advances during expansion molding, part of the gel-like resin that is not yet solidified flows into the enlarged cavity. . At this time, the gel-like resin is in a solidified state and is much softer than the slide type made of hard metal or hard resin, so the gel-like resin acts as a cushion (buffer) and slide type The output at the periphery of the tip is absorbed and relaxed. Therefore, cracks do not occur at the boundary between the solid portion and the molded body having the expansion layer around the base portion, and the rigidity and strength of the molded resin molded body can be ensured. In addition, a concave portion having an open port is formed by a slide-type molding surface in a portion corresponding to the slide mold of the solid portion, and a solid layer is formed toward the open port side at a location corresponding to the chamfered portion of the molding surface on the bottom surface. Since the thickness is formed to be thick, the rigidity strength, particularly the buckling strength, of the solid portion can be further improved. Furthermore, by simply forming a chamfered portion on the slide mold, it is possible to inexpensively mold a resin molded body having excellent strength and rigidity without a crack as described above with a simple mold structure without significantly modifying the mold structure. it can.

請求項2に係る発明によれば、ソリッド部とその基部周辺に膨張層を有する成形体本体との境界部に亀裂が発生することを確実に防止するとともに、軽量化を促進した樹脂成形体を得ることができる。   According to the second aspect of the invention, there is provided a resin molded body that reliably prevents the occurrence of cracks at the boundary between the solid portion and the molded body having an expanded layer around the base portion and promotes weight reduction. Obtainable.

以下、この発明の実施の形態について図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図4は自動車のサイドドア1の断面図である。該サイドドア1はドアアウタパネル3とドアインナパネル5とからなる金属製のドア本体7を備え、該ドア本体7の上記ドアインナパネル5にパネル状の樹脂成形体としての樹脂製キャリアプレート(ドアモジュールプレート)9がシール材11を介して取り付けられ、ドアトリム13が上記キャリアプレート9を車室内側から被うように上記ドアインナパネル5に取り付けられている。   FIG. 4 is a sectional view of the side door 1 of the automobile. The side door 1 includes a metal door main body 7 including a door outer panel 3 and a door inner panel 5. The door inner panel 5 of the door main body 7 has a resin carrier plate (door) as a panel-shaped resin molded body. A module plate 9 is attached via a seal material 11, and a door trim 13 is attached to the door inner panel 5 so as to cover the carrier plate 9 from the vehicle interior side.

上記キャリアプレート9は、繊維入り熱可塑性樹脂で成形され、その主体をなす成形体本体としてのプレート本体15を備えている。該プレート本体15の一側面(車室外側面)の外周縁部には、図3にも示すように、上記シール材11を収容するシール溝部17が形成されている。また、上記プレート本体15の一部、つまりプレート本体15の外周縁部近傍(シール溝部17内側)には、プレート本体15をドアインナパネル5に取り付ける平面視円形状の取付部19が複数個所定間隔をあけて全周に亘って一体に形成され、該各取付部19には締結用の貫通孔19aがプレート本体15を貫通するように形成されている。そして、キャリアプレート9をドアインナパネル5に重ねて上記各取付部19の貫通孔19aをドアインナパネル5の複数個のボルト挿通孔5aに対応させた状態で、ボルト21を車室内側から各貫通孔19a及びボルト挿通孔5aに挿通し、ドアインナパネル5の車室外側面に溶着されたウェルドナット23に螺合させることにより、キャリアプレート9をドアインナパネル5に取り付けている(図4参照)。さらに、上記プレート本体15の一部、つまりプレート本体15の図3で右上には、図示しないウインドガラス昇降用モータを取り付けるための平面視略三角形の取付部25が形成され、該取付部25には円形状のモータ取付孔25aがプレート本体15を貫通するように形成されているとともに、該モータ取付孔25aの周りには3個のネジ挿通用の貫通孔25bが三角形の頂点の位置に対応してプレート本体15を貫通するように形成されている。   The carrier plate 9 is formed of a thermoplastic resin containing fibers, and includes a plate body 15 as a molded body that is the main body. As shown in FIG. 3, a seal groove portion 17 that accommodates the seal material 11 is formed on the outer peripheral edge portion of one side surface (vehicle compartment outer side surface) of the plate body 15. A plurality of mounting portions 19 having a circular shape in a plan view for attaching the plate body 15 to the door inner panel 5 are provided in a part of the plate body 15, that is, in the vicinity of the outer peripheral edge of the plate body 15 (inside the seal groove portion 17). It is integrally formed over the entire circumference with a space therebetween, and a fastening through hole 19 a is formed in each mounting portion 19 so as to penetrate the plate body 15. Then, the carrier plate 9 is overlaid on the door inner panel 5 and the bolts 21 are connected from the vehicle interior side in a state where the through holes 19a of the mounting portions 19 correspond to the plurality of bolt insertion holes 5a of the door inner panel 5, respectively. The carrier plate 9 is attached to the door inner panel 5 by being inserted into the through hole 19a and the bolt insertion hole 5a and screwed to the weld nut 23 welded to the outer surface of the door inner panel 5 (see FIG. 4). ). Further, a part of the plate main body 15, that is, an upper right portion of the plate main body 15 in FIG. The circular motor mounting hole 25a is formed so as to penetrate the plate body 15, and three screw insertion through holes 25b around the motor mounting hole 25a correspond to the positions of the apexes of the triangle. The plate body 15 is formed so as to penetrate therethrough.

上記プレート本体15は、後述する成形型33のキャビティ43内に射出充填した繊維入り熱可塑性樹脂Rが成形型33(固定型35、可動型37、スライド型39)の成形面35a,37a,39a近傍にスキン層27が生成された時点で、該プレート本体15に対応するキャビティ容積を拡大して上記繊維入り熱可塑性樹脂Rを膨張させることにより、図1(b)に示すように、空隙がなく樹脂密度の高い堅いスキン層27が表面に形成されるとともに、多数の空隙(図示せず)を有し上記スキン層27に比べて樹脂密度の低い膨張層29が内部に形成されている。図4では作図上の都合によりプレート本体15を単一層として表している。これに対し、上記取付部19,25は、図1(b)及び図5に示すように、上記膨張層29を有することなく樹脂密度の高いソリッド層31のみからなるソリッド部である。また、上記取付部19のスライド型対応箇所には開放口32aを有す平面視円形状の凹部32が円柱状のスライド型39の成形面39aによって形成され、その底面には上記成形面39aの面取部39cによって傾斜面32bが形成され、該傾斜面32bに対応するソリッド層31の肉厚が開放口32a側に向けて徐々に厚くなるように形成されている。   The plate body 15 is made of a molding surface 35a, 37a, 39a of a molding die 33 (a fixed die 35, a movable die 37, a slide die 39) formed of a thermoplastic resin R containing fibers injected and filled into a cavity 43 of a molding die 33 described later. When the skin layer 27 is generated in the vicinity, the cavity volume corresponding to the plate body 15 is expanded to expand the fiber-containing thermoplastic resin R, so that the voids are formed as shown in FIG. In addition, a hard skin layer 27 having a high resin density is formed on the surface, and an expanded layer 29 having a large number of voids (not shown) and having a resin density lower than that of the skin layer 27 is formed inside. In FIG. 4, the plate body 15 is shown as a single layer for convenience of drawing. On the other hand, as shown in FIGS. 1B and 5, the mounting portions 19 and 25 are solid portions that are formed only of the solid layer 31 having a high resin density without the expansion layer 29. A concave portion 32 having a circular shape in plan view having an opening 32a is formed by a molding surface 39a of a columnar slide die 39 at a position corresponding to the slide mold of the mounting portion 19, and the bottom surface of the molding surface 39a is formed on the bottom surface. An inclined surface 32b is formed by the chamfered portion 39c, and the thickness of the solid layer 31 corresponding to the inclined surface 32b is formed so as to gradually increase toward the opening 32a side.

このようなキャリアプレート9は、図1及び図2に示すような成形型33を用いて成形される。   Such a carrier plate 9 is formed using a forming die 33 as shown in FIGS.

この成形型33は、成形面35aがプレート本体15の取付部19,25を除く車室内側面の形状に対応した固定型35と、該固定型35に対して進退可能に対向配置され成形面37aがプレート本体15の車室外側面の形状に対応した可動型37とを備えている。なお、図1及び図2は、キャリアプレート取付用の取付部19の型構造であり、以下、これに基づき説明する。上記固定型35は、上記キャリアプレート9のソリッド部のうち、キャリアプレート取付用の取付部19に対応するように成形面35aに上記取付部19より大きく開口するスライド型収容部35bを有している。上記可動型37の成形面37aには、上記取付部19に対応するように凹部37bが形成され、該凹部37b底面には取付部19の貫通孔19aに対応するように突出部37cが突設されている。上記固定型35のスライド型収容部35bには、先端に成形面39aが形成されたスライド型39が配置され、該スライド型39は、上記スライド型収容部35b内に配置された油圧シリンダ41のピストンロッド41aに連結され、該油圧シリンダ41の伸縮作動により進退可能になっている。また、上記スライド型39の成形面39aには、上記可動型37の突出部37c先端が嵌合する嵌合凹部39bが形成されている。そして、上記成形型33を型閉じした状態で、固定型35、可動型37及びスライド型39の各々の成形面35a,37a,39a間にキャビティ43が形成される。   The molding die 33 has a molding surface 35a corresponding to the shape of the side surface of the vehicle interior except for the attachment portions 19 and 25 of the plate body 15, and a molding surface 37a that is opposed to the stationary die 35 so as to be able to advance and retreat. Is provided with a movable die 37 corresponding to the shape of the outer side surface of the plate main body 15. 1 and 2 show the mold structure of the mounting portion 19 for mounting the carrier plate, which will be described below. The fixed die 35 has a slide type accommodation portion 35b that opens larger than the attachment portion 19 on the molding surface 35a so as to correspond to the attachment portion 19 for attaching the carrier plate among the solid portions of the carrier plate 9. Yes. A recess 37b is formed on the molding surface 37a of the movable mold 37 so as to correspond to the mounting portion 19, and a protrusion 37c is provided on the bottom surface of the recess 37b so as to correspond to the through hole 19a of the mounting portion 19. Has been. A slide mold 39 having a molding surface 39a formed at the tip is disposed in the slide mold housing portion 35b of the fixed mold 35. The slide mold 39 is connected to the hydraulic cylinder 41 disposed in the slide mold housing section 35b. It is connected to the piston rod 41 a and can be advanced and retracted by the expansion and contraction operation of the hydraulic cylinder 41. Further, the molding surface 39a of the slide mold 39 is formed with a fitting recess 39b into which the tip of the protruding portion 37c of the movable mold 37 is fitted. Then, with the mold 33 closed, a cavity 43 is formed between the molding surfaces 35a, 37a, 39a of the fixed mold 35, the movable mold 37, and the slide mold 39.

この発明の特徴として、上記スライド型39の先端外周縁部には、斜めに直線的に切り欠いた傾斜面からなる面取部39cが形成されている。該面取部39cは、スライド型39外周縁から略均等幅をもって形成されるとともに、スライド型39の軸心Oから面取部39c外周縁までの寸法(L1)と、上記軸心Oから面取部39c内周縁までの寸法(L2)との比(L2/L1)が0.4以上0.9以下に設定されている。このように設定したのは、L2/L1が0.4未満では、スライド型39の直径、すなわちスライド型39の外形(断面積)が大きくなってソリッド層31が多くなるため、軽量化が促進されなくなるからである。一方、L2/L1が0.9を超えると、スライド型39先端の面取部39cが小さくなって該面取部39c近傍の射出充填量が少なくなり、取付部19とその基部周辺に膨張層29を有するプレート本体15との境界部に亀裂が発生するからである。そして、上記スライド型39は、繊維入り熱可塑性樹脂Rをキャビティ43内に射出充填する際には、該スライド型39の面取部39cがキャビティ43内に突出するように位置付けられ(図1(a)参照)、上記キャビティ43内に射出充填した繊維入り熱可塑性樹脂Rの成形型33の成形面35a,37a,39a近傍にスキン層27が生成された時点で、スライド型対応箇所のキャビティ容積が拡大しないように上記可動型37のキャビティ容積拡大方向A1への後退動作に矢印A2方向へと追従させてキャビティ43内にさらに進出するように構成されている。なお、固定型35のスライド型収容部35b周りの成形面35aには環状の***部35cが形成され、該***部35cは、樹脂射出充填時にキャビティ43内に突出しているスライド型39の面取部39cと連続するようになっている(図1(a)参照)。また、図2中、45は固定型35に形成された樹脂通路である。   As a feature of the present invention, a chamfered portion 39c is formed on the outer peripheral edge portion of the slide die 39. The chamfered portion 39c is formed with a substantially uniform width from the outer peripheral edge of the slide die 39, the dimension (L1) from the axis O of the slide die 39 to the outer peripheral edge of the chamfered portion 39c, and the axis O to the surface. The ratio (L2 / L1) to the dimension (L2) to the inner peripheral edge of the catch portion 39c is set to 0.4 or more and 0.9 or less. The reason why this is set is that when L2 / L1 is less than 0.4, the diameter of the slide mold 39, that is, the outer shape (cross-sectional area) of the slide mold 39 is increased and the solid layer 31 is increased. Because it will not be done. On the other hand, when L2 / L1 exceeds 0.9, the chamfered portion 39c at the tip of the slide die 39 is reduced, and the injection filling amount in the vicinity of the chamfered portion 39c is reduced, so that an expansion layer is formed around the mounting portion 19 and its base portion. This is because a crack occurs at the boundary with the plate body 15 having 29. The slide mold 39 is positioned so that the chamfered portion 39c of the slide mold 39 projects into the cavity 43 when the fiber-containing thermoplastic resin R is injected and filled into the cavity 43 (FIG. 1 ( a))), when the skin layer 27 is generated in the vicinity of the molding surfaces 35a, 37a, 39a of the molding die 33 of the fiber-containing thermoplastic resin R injected and filled in the cavity 43, the cavity volume of the corresponding portion of the slide die Is configured to further advance into the cavity 43 by following the backward movement of the movable die 37 in the cavity volume expansion direction A1 in the arrow A2 direction. An annular raised portion 35c is formed on the molding surface 35a around the slide mold accommodating portion 35b of the fixed die 35, and the raised portion 35c is chamfered on the slide die 39 protruding into the cavity 43 during resin injection filling. It is continuous with the portion 39c (see FIG. 1A). In FIG. 2, 45 is a resin passage formed in the fixed mold 35.

次に、キャリアプレート9の成形要領について説明する。   Next, the procedure for forming the carrier plate 9 will be described.

まず、図1(a)に示すように、成形型33を型閉じする。この状態で、スライド型39は油圧シリンダ41の伸長作動により進出方向に付勢されているが、可動型37の突出部37c先端がスライド型39の嵌合凹部39bに嵌合して進出動作が規制されているため、スライド型39の面取部39cを含む先端部分がキャビティ43内に突出するように位置付けられている。   First, as shown in FIG. 1A, the mold 33 is closed. In this state, the slide mold 39 is urged in the advance direction by the extension operation of the hydraulic cylinder 41, but the distal end of the projecting portion 37c of the movable mold 37 is fitted into the fitting recess 39b of the slide mold 39, and the advance operation is performed. Since it is regulated, the tip portion including the chamfered portion 39 c of the slide mold 39 is positioned so as to protrude into the cavity 43.

次いで、キャビティ43内に射出機(図示せず)から樹脂通路45を経てガラス繊維等の繊維入り熱可塑性樹脂R(例えば繊維入りポリプロピレン樹脂)を射出充填する。   Next, a thermoplastic resin R containing fibers such as glass fibers (for example, polypropylene resin containing fibers) is injected and filled into the cavity 43 from an injection machine (not shown) through the resin passage 45.

その後、成形型33のキャビティ43内に射出充填された繊維入り熱可塑性樹脂Rが固化する過程で、すなわち、キャビティ43における成形型33の成形面35a,37a,39a近傍にスキン層27が生成された時点で、図1(b)に示すように、可動型37をキャビティ容積拡大方向A1(型開き方向)に後退させる。つまり、可動型37を固定型35から僅かに離れさせ、キャビティ容積を例えば2倍もしくはそれ以上に拡大させる。これに伴い、スライド型39が可動型37の後退動作に矢印A2方向へと追従してキャビティ41内にさらに進出し、このため、スライド型対応箇所のキャビティ容積は拡大しない。この段階で、繊維入り熱可塑性樹脂Rは、成形型33の成形面35a,37a,39aと接触する部分が型温の影響により早期に冷却されているため、空隙がなく堅いスキン層27となって表面層を構成する。一方、繊維入り熱可塑性樹脂Rの内側部分は型温の影響を受け難く、粘度の高いゲル状態になっている。したがって、キャビティ容積の拡大により、それまで固定型35及び可動型37で圧縮されている繊維入り熱可塑性樹脂Rが可動型37の成形面37aに引っ張られて膨張する。この際、繊維入り熱可塑性樹脂R中の繊維も上記圧縮が軽減されて弾性的に復元し、この弾性復元力(スプリングバック現象)によっても上記熱可塑性樹脂Rが膨張する。このことにより、空隙がなく堅いスキン層27が表面に形成されるとともに、内部に多数の空隙(図示せず)を有する膨張層29が形成されたプレート本体15が膨張成形される。また、キャリアプレート取付用の複数個の取付部19に対応するキャビティ43内の繊維入り熱可塑性樹脂Rは、可動型37がキャビティ容積拡大方向A1に後退しても、この後退動作にスライド型39が矢印A2方向へと追従してキャビティ41内に進出するので、当該キャビティ空間は拡大せず、したがって、可動型37の成形面37aに引っ張られずに動かないため、堅いソリッド層31からなる取付部19がプレート本体15に一体に成形され、キャリアプレート9が膨張成形される。そして、上記取付部19のスライド型対応箇所には開放口32aを有する凹部32がスライド型39の成形面39aによって形成され、その底面には上記成形面39aの面取部39cによって傾斜面32bが形成され、該傾斜面32bに対応するソリッド層31の肉厚が開放口32a側に向けて厚くなるように形成されている。   Thereafter, the skin layer 27 is generated in the process of solidifying the fiber-containing thermoplastic resin R injected and filled in the cavity 43 of the mold 33, that is, in the vicinity of the molding surfaces 35 a, 37 a, 39 a of the mold 33 in the cavity 43. At that time, as shown in FIG. 1B, the movable die 37 is retracted in the cavity volume expansion direction A1 (die opening direction). That is, the movable die 37 is slightly separated from the fixed die 35, and the cavity volume is increased by, for example, twice or more. Along with this, the slide die 39 follows the backward movement of the movable die 37 in the direction of the arrow A2, and further advances into the cavity 41. For this reason, the cavity volume of the slide die corresponding portion does not increase. At this stage, the fiber-containing thermoplastic resin R becomes a hard skin layer 27 without voids because the portions that contact the molding surfaces 35a, 37a, 39a of the molding die 33 are cooled early due to the influence of the mold temperature. To form a surface layer. On the other hand, the inner part of the fiber-containing thermoplastic resin R is hardly affected by the mold temperature and is in a gel state with high viscosity. Therefore, as the cavity volume increases, the fiber-containing thermoplastic resin R that has been compressed by the fixed mold 35 and the movable mold 37 is pulled by the molding surface 37 a of the movable mold 37 and expands. At this time, the fibers in the fiber-containing thermoplastic resin R are also elastically restored with the compression reduced, and the thermoplastic resin R expands also by this elastic restoring force (spring back phenomenon). As a result, a rigid skin layer 27 having no voids is formed on the surface, and the plate body 15 in which the expansion layer 29 having a large number of voids (not shown) is formed is expanded. Further, the fiber-containing thermoplastic resin R in the cavity 43 corresponding to the plurality of mounting portions 19 for mounting the carrier plate is slid into the slide mold 39 even if the movable mold 37 is retracted in the cavity volume expansion direction A1. Follows the direction of the arrow A2 and advances into the cavity 41, so that the cavity space does not expand, and therefore does not move without being pulled by the molding surface 37a of the movable die 37. 19 is integrally formed with the plate body 15, and the carrier plate 9 is formed by expansion. A concave portion 32 having an opening 32a is formed by a molding surface 39a of the slide die 39 at a position corresponding to the slide die of the mounting portion 19, and an inclined surface 32b is formed by a chamfered portion 39c of the molding surface 39a on the bottom surface. The solid layer 31 is formed so that the thickness of the solid layer 31 corresponding to the inclined surface 32b increases toward the open port 32a.

このようにして膨張成形されたキャリアプレート9では、プレート本体15が膨張層29を有しないソリッド層のみからなりかつ本実施形態のプレート本体15と同一肉厚である場合に比べて、軽量化を図ることができる。   In the carrier plate 9 thus expanded and formed, the plate main body 15 is made of only a solid layer having no expansion layer 29 and has the same thickness as the plate main body 15 of the present embodiment. Can be planned.

また、上記取付部19が膨張層29のない樹脂密度の高いソリッド層31のみからなるため、取付部19の剛性強度を高めることができる。   Further, since the mounting portion 19 is composed only of the solid layer 31 having a high resin density without the expansion layer 29, the rigidity strength of the mounting portion 19 can be increased.

さらに、射出充填の際キャビティ43内に突出したスライド型39が膨張成形時にさらにキャビティ43内に進出するが、その際、スライド型39には面取部39cが形成されているため、面取部39cが形成されていないものに比べてスライド型39先端近傍の樹脂充填量が多く、これにより膨張成形の際スライド型39がさらに進出すると、まだ固化状態にないゲル状の樹脂の一部が拡大したキャビティ43内に流出する。この際、ゲル状の樹脂は固化進行状態にある樹脂であり、硬い金属製や硬質樹脂製のスライド型に比べて格段に柔らかいため、ゲル状の樹脂がクッション(緩衝)を作用してスライド型39の先端周辺部の進出力は吸収緩和される。したがって、取付部19とその基部周辺に膨張層29を有するプレート本体19との境界部に亀裂が発生せず、成形されたキャリアプレート9の剛性強度を確保することができる。   Further, the slide mold 39 protruding into the cavity 43 at the time of injection filling further advances into the cavity 43 at the time of expansion molding. At this time, the chamfered portion 39c is formed on the slide mold 39, so that the chamfered portion is formed. The amount of resin filling in the vicinity of the tip of the slide mold 39 is larger than that in which the 39c is not formed. As a result, when the slide mold 39 further advances during expansion molding, a part of the gel-like resin that is not yet solidified is expanded. Flow into the cavity 43. At this time, the gel resin is a resin in a solidified state, and is much softer than the hard metal or hard resin slide mold, so the gel resin acts as a cushion (buffer) and slide type The advance output around the tip of 39 is absorbed and relaxed. Therefore, no crack is generated at the boundary between the mounting portion 19 and the plate body 19 having the expansion layer 29 around the base portion, and the rigidity and strength of the molded carrier plate 9 can be ensured.

さらにまた、取付部19のスライド型対応箇所には開放口32aを有する凹部32がスライド型39の成形面39aによって形成され、その底面の上記成形面39aの面取部39cに対応する箇所では開放口32a側に向けてソリッド層31の肉厚が厚くなるように形成されているため、取付部19の剛性強度、特に座屈強度をさらに向上させることができる。   Furthermore, a concave portion 32 having an opening 32a is formed by a molding surface 39a of the slide die 39 at a location corresponding to the slide mold of the mounting portion 19, and is opened at a location corresponding to the chamfered portion 39c of the molding surface 39a on the bottom surface. Since the solid layer 31 is formed so as to increase in thickness toward the mouth 32a, the rigidity strength, particularly the buckling strength, of the mounting portion 19 can be further improved.

加えて、面取部39cをスライド型39外周縁から略均等幅をもって形成するとともに、スライド型39の軸心Oから面取部39c外周縁までの寸法(L1)と、上記軸心Oから面取部39c内周縁までの寸法(L2)との比(L2/L1)を0.4以上0.9以下に設定しているので、取付部19とその基部周辺に膨張層29を有するプレート本体15との境界部に亀裂が発生することを確実に防止するとともに、軽量化を促進したキャリアプレート9を得ることができる。   In addition, the chamfered portion 39c is formed with a substantially uniform width from the outer peripheral edge of the slide die 39, the dimension (L1) from the axis O of the slide die 39 to the outer peripheral edge of the chamfered portion 39c, and the axis O to the surface. Since the ratio (L2 / L1) to the dimension (L2) to the inner peripheral edge of the take-up portion 39c is set to 0.4 or more and 0.9 or less, the plate body having the inflating layer 29 around the mounting portion 19 and its base portion As a result, it is possible to reliably prevent the occurrence of cracks at the boundary between the carrier plate 9 and the carrier plate 9 that promotes weight reduction.

また、スライド型39に面取部39cを形成するだけで、型構造を大幅に改変することなく簡素な型構造で上述の如き亀裂がなく優れた剛性強度を有するキャリアプレート9を安価に成形することができる。   Further, by simply forming the chamfered portion 39c on the slide mold 39, the carrier plate 9 having a simple mold structure and no cracks as described above and having excellent rigidity and strength can be formed at a low cost without significantly modifying the mold structure. be able to.

なお、上記の実施形態では、キャリアプレート取付用の取付部19のスライド型39に面取部39cを形成して取付部19とその基部周辺に膨張層29を有するプレート本体15との境界部に亀裂が発生しないようにしたが、ウインドガラス昇降用モータ取付け用の取付部25のスライド型39にも同様に面取部39cを形成して取付部25とその基部周辺に膨張層29を有するプレート本体15との境界部に亀裂が発生しないようにしてもよい。   In the above embodiment, the chamfered portion 39c is formed in the slide mold 39 of the mounting portion 19 for mounting the carrier plate, and the boundary portion between the mounting portion 19 and the plate body 15 having the expansion layer 29 around the base portion. Although the crack is not generated, a plate having a chamfered portion 39c is similarly formed on the slide die 39 of the mounting portion 25 for attaching the window glass raising / lowering motor, and the expansion portion 29 is provided around the mounting portion 25 and its base portion. You may make it a crack not generate | occur | produce in the boundary part with the main body 15. FIG.

また、上記の実施形態では、スライド型39の面取部39cを斜めに直線的に切り欠いた傾斜面で構成したが、上記面取部39cは直角に切り欠いた形状にしたり、あるいは凸状湾曲面や凹状湾曲面等で構成してもよい。また、上記スライド型39及びこれにより形成される取付部19は、横断面が円形状以外に楕円形状や矩形状等であってもよく、ウインドガラス昇降用モータ取付用の取付部25も平面視略三角形に限らない。   In the above-described embodiment, the chamfered portion 39c of the slide mold 39 is formed by an inclined surface that is obliquely cut out linearly. However, the chamfered portion 39c is cut out at a right angle or is convex. You may comprise a curved surface, a concave curved surface, etc. Further, the slide mold 39 and the mounting portion 19 formed thereby may have an elliptical shape or a rectangular shape in addition to a circular cross section, and the mounting portion 25 for mounting the window glass lifting motor is also a plan view. It is not limited to a substantially triangular shape.

さらに、上記の実施形態において、繊維入り熱可塑性樹脂Rに発泡材を含有させれば、可動型37の後退量すなわち膨張倍率を大きくしてプレート本体15の可動型37後退方向の肉厚(板厚)を厚くした場合、繊維入り熱可塑性樹脂Rの膨張量が不足しても、発泡材の発泡力(膨張圧)がそれを補完して空隙を確実に形成することができて好ましい。これらの場合、発泡材としては、化学反応によりガスを発生させる化学的発泡材や、二酸化炭素ガス及び窒素ガス等の不活性ガスを用いる物理的発泡材等がある。   Furthermore, in the above embodiment, if a foamed material is contained in the fiber-containing thermoplastic resin R, the retraction amount of the movable mold 37, that is, the expansion ratio is increased, and the thickness of the plate body 15 in the retracting direction of the movable mold 37 (plate) When the thickness is increased, even if the expansion amount of the fiber-containing thermoplastic resin R is insufficient, the foaming force (expansion pressure) of the foam material complements it, and it is preferable that the voids can be formed reliably. In these cases, examples of the foam material include a chemical foam material that generates a gas by a chemical reaction, and a physical foam material that uses an inert gas such as carbon dioxide gas and nitrogen gas.

さらにまた、上記の実施形態では、樹脂成形体が自動車のサイドドアのキャリアプレート9である場合を示したが、インストルメントパネル、ドアトリム、トランクボード等の他の自動車用パネルや自動車以外の家電製品、住宅用パネル等にも適用することができるものである。   Furthermore, in the above embodiment, the case where the resin molded body is the carrier plate 9 of the side door of the automobile is shown. However, other automobile panels such as instrument panels, door trims, trunk boards, etc. It can also be applied to residential panels.

この発明は、樹脂密度の高いスキン層が表面に形成されるとともに多数の空隙を有し上記スキン層に比べて樹脂密度の低い膨張層が内部に形成された成形体本体の一部に、上記膨張層を有することなく樹脂密度の高いソリッド層のみからなるソリッド部が形成されたパネル状の樹脂成形体をキャビティ内に繊維入り熱可塑性樹脂を射出充填して成形する成形型について有用である。   In the present invention, a skin layer having a high resin density is formed on the surface, and there are a large number of voids. This is useful for a molding die in which a panel-like resin molded body in which a solid portion composed only of a solid layer having a high resin density without an expanded layer is formed by injection filling a thermoplastic resin containing fibers into a cavity.

(a)は図2のA部拡大図、(b)は可動型をキャビティ容積が拡大する方向に僅かに後退させた状態を示す図1(a)相当図である。2A is an enlarged view of a portion A in FIG. 2, and FIG. 1B is a view corresponding to FIG. 1A showing a state in which the movable mold is slightly retracted in the direction in which the cavity volume is enlarged. キャビティ内に繊維入り熱可塑性樹脂を射出充填した状態の成形型を概略的に示す断面図である。It is sectional drawing which shows schematically the shaping | molding die of the state which injected and filled the thermoplastic resin containing a fiber in the cavity. キャリアプレートを車室外側から見た正面図である。It is the front view which looked at the carrier plate from the vehicle compartment outer side. 図3のIV−IV線における自動車のサイドドア断面図である。FIG. 4 is a cross-sectional view of the side door of the automobile taken along line IV-IV in FIG. 図3のV−V線における断面図である。It is sectional drawing in the VV line | wire of FIG.

符号の説明Explanation of symbols

9 キャリアプレート(樹脂成形体)
15 プレート本体(成形体本体)
19 取付部(ソリッド部)
27 スキン層
29 膨張層
31 ソリッド層
33 成形型
35 固定型
35a 成形面
35b スライド型収容部
37 可動型
37a 成形面
39 スライド型
39a 成形面
39c 面取部
43 キャビティ
L1 スライド型の軸心から面取部外周縁までの寸法
L2 スライド型の心から面取部内周縁までの寸法
R 繊維入り熱可塑性樹脂
9 Carrier plate (resin molding)
15 Plate body (molded body)
19 Mounting part (solid part)
27 Skin layer 29 Expanding layer 31 Solid layer 33 Mold 35 Fixed mold 35a Molding surface 35b Slide mold housing part 37 Movable mold 37a Molding surface 39 Slide mold 39a Molding surface 39c Chamfer 43 Cavity L1 Chamfer from the center of the slide mold Dimension L2 to the outer periphery of the part R Dimension R from the center of the slide mold to the inner periphery of the chamfered part Fiber-filled thermoplastic resin

Claims (2)

樹脂密度の高いスキン層が表面に形成されるとともに多数の空隙を有し上記スキン層に比べて樹脂密度の低い膨張層が内部に形成された成形体本体の一部に、上記膨張層を有することなく樹脂密度の高いソリッド層のみからなるソリッド部が形成されたパネル状の樹脂成形体をキャビティ内に繊維入り熱可塑性樹脂を射出充填して成形する成形型であって、
上記樹脂成形体のソリッド部に対応するように成形面に開口するスライド型収容部を有する固定型と、
該固定型に対して進退可能に対向配置された可動型と、
上記固定型のスライド型収容部に進退可能に配置され先端に成形面が形成されるとともに先端外周縁部に面取部が形成されたスライド型とを備え、
上記繊維入り熱可塑性樹脂をキャビティ内に射出充填する際には、上記スライド型を該スライド型の面取部が上記キャビティ内に突出するように位置付け、上記キャビティ内に射出充填した繊維入り熱可塑性樹脂の成形型の成形面近傍にスキン層が生成された時点で、上記可動型をキャビティ容積拡大方向に後退させて繊維入り熱可塑性樹脂を膨張させるとともに、スライド型対応箇所のキャビティ容積が拡大しないように上記スライド型を上記可動型のキャビティ容積拡大方向への後退動作に追従させてキャビティ内にさらに進出させるように構成されていることを特徴とする成形型。
A skin layer having a high resin density is formed on the surface, and there are a large number of voids. The expansion layer having a resin density lower than that of the skin layer is formed inside. A molding die for molding a panel-shaped resin molded body in which a solid portion consisting only of a solid layer having a high resin density is formed by injection filling a thermoplastic resin containing fibers into a cavity,
A fixed mold having a slide mold accommodating part that opens to the molding surface so as to correspond to the solid part of the resin molded body;
A movable mold disposed opposite to the fixed mold so as to be able to advance and retreat;
A slide mold in which the molding surface is formed at the tip and the chamfered portion is formed at the outer peripheral edge of the tip;
When injection filling the fiber-containing thermoplastic resin into the cavity, the slide mold is positioned so that the chamfered portion of the slide mold protrudes into the cavity, and the fiber-containing thermoplastic is injected and filled into the cavity. When the skin layer is generated in the vicinity of the molding surface of the resin mold, the movable mold is retracted in the cavity volume expansion direction to expand the fiber-containing thermoplastic resin, and the cavity volume corresponding to the slide mold does not expand. Thus, the molding die is configured to further advance into the cavity by following the retraction operation of the movable die in the cavity volume expansion direction.
請求項1に記載の成形型において、
面取部は、スライド型外周縁から略均等幅をもって形成されるとともに、スライド型の軸心から面取部外周縁までの寸法(L1)と、上記軸心から面取部内周縁までの寸法(L2)との比(L2/L1)が0.4以上0.9以下に設定されていることを特徴とする成形型。
The mold according to claim 1, wherein
The chamfered portion is formed with a substantially uniform width from the outer periphery of the slide mold, and has a dimension (L1) from the axis of the slide mold to the outer periphery of the chamfer, and a dimension from the axis to the inner periphery of the chamfer ( A mold having a ratio (L2 / L1) to L2) of 0.4 or more and 0.9 or less.
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