JP5967644B2 - Press molding apparatus and press molding product molding method - Google Patents
Press molding apparatus and press molding product molding method Download PDFInfo
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Description
本発明は、連続繊維を複合したシート状の繊維強化プラスチック材をプレス成形するプレス成形装置及び繊維強化プラスチック材からなるプレス成形品の成形方法に関する。 The present invention relates to a press molding apparatus for press molding a sheet-like fiber reinforced plastic material composited with continuous fibers and a method for molding a press molded product made of a fiber reinforced plastic material.
従来より、例えば、自動車や飛行機といった機械及び構造物は、強度安全性の向上や軽量化による燃費向上等が求められ、これらの要求を達成するために、上記機械及び構造物の製造に使用する材料として、軽量で、且つ、優れた力学的特性を有する繊維強化プラスチック材が一般的に使用されている。 2. Description of the Related Art Conventionally, for example, machines and structures such as automobiles and airplanes are required to improve strength and safety, improve fuel efficiency by reducing weight, and are used for manufacturing the machines and structures to achieve these requirements. As a material, a fiber reinforced plastic material that is lightweight and has excellent mechanical properties is generally used.
該繊維強化プラスチック材の成形装置は様々なものがあり、その中の１つに連続繊維を複合したシート状の繊維強化プラスチック材をプレス成形するプレス成形装置がある。例えば、特許文献１のプレス成形装置は、繊維強化プラスチック材の一方の面を挟圧保持するホルダ面を有するダイと、該ダイに対向配置され、上記繊維強化プラスチック材の他方の面を挟圧保持するホルダとを備えている。上記ダイには、プレス成形品の成形部に対応する凹部が凹設され、上記ホルダには、プレス成形品の成形部に対応する孔部が形成されている。 There are various apparatuses for molding the fiber reinforced plastic material, and one of them is a press molding apparatus that press-molds a sheet-like fiber reinforced plastic material in which continuous fibers are combined. For example, the press molding apparatus of Patent Document 1 includes a die having a holder surface that holds and holds one surface of a fiber-reinforced plastic material, and a die that is disposed opposite to the die and presses the other surface of the fiber-reinforced plastic material. And a holder for holding. The die has a recess corresponding to the molding part of the press-molded product, and the holder has a hole corresponding to the molding part of the press-molded product.
そして、上記ホルダの孔部には、パンチが進退可能に配置され、加熱したシート状の繊維強化プラスチック材を型開きした上記ダイ及びホルダ間に搬入し、上記ダイ及びホルダの型閉じ動作によりダイのホルダ部及びホルダで繊維強化プラスチック材の外周を挟持した状態で、上記パンチを上記ダイの凹部へ進出させることにより、上記繊維強化プラスチック材を所定形状にプレス成形するようになっている。 A punch is disposed in the hole portion of the holder so that the punch can be moved forward and backward, and a heated sheet-like fiber reinforced plastic material is carried between the die and the holder which are opened, and the die and holder are closed by a die closing operation. The fiber reinforced plastic material is press-molded into a predetermined shape by advancing the punch into the concave portion of the die in a state where the outer periphery of the fiber reinforced plastic material is held between the holder portion and the holder.
しかし、特許文献１のプレス成形装置でプレス成形を行うと、プレス成形時に上記繊維強化プラスチック材の上記挟持部に対応する部分から上記孔部に向かって流動する材料のうち、成形部のコーナー部に対応する部分は、当該部分の両隣の材料の流動によって行き場が無くなって孔部に向かって流動し難くなるので、流動し易い部分とし難い部分とによって、成形後のプレス成形品における上記ダイ及びホルダの挟持部分に対応する部分の繊維が湾曲したり蛇行したりしてしまう。プレス成形品の繊維が湾曲したり蛇行すると、当該部分の物性値が低下してしまうので、所望する適用部品に適用できなくなるおそれがある。 However, when press molding is performed with the press molding apparatus of Patent Document 1, the corner portion of the molding portion of the material that flows from the portion corresponding to the sandwiching portion of the fiber reinforced plastic material toward the hole portion during press molding. The part corresponding to the above has no place due to the flow of the material on both sides of the part and is difficult to flow toward the hole part. The fiber of the part corresponding to the holding part of a holder will bend or meander. When the fiber of the press-formed product is bent or meandering, the physical property value of the part is lowered, so that it may not be applicable to a desired application part.
本発明は、斯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、繊維強化プラスチック材をプレス成形する際にプレス成形品の物性値が低下するのを防止することにある。 This invention is made | formed in view of such a point, The place made into the objective is to prevent that the physical-property value of a press-formed product falls when press-molding a fiber reinforced plastic material.
上記の目的を達成するために、本発明は、ダイ及びホルダの少なくとも一方に繊維強化プラスチック材を挟持する部分を複数離間した位置に設け、該各挟持する部分の間に凹部を設けたことを特徴とする。 In order to achieve the above object, according to the present invention, at least one of a die and a holder is provided with a portion for holding a fiber reinforced plastic material at a plurality of spaced positions, and a recess is provided between the holding portions. Features.
具体的には、連続繊維を複合したシート状をなす加熱状態の繊維強化プラスチック材の一方の面を挟圧保持するホルダ面を有するダイと、該ダイに対向配置され、上記繊維強化プラスチック材の他方の面を挟圧保持するホルダとを備え、上記ダイ及びホルダには、成形部にコーナー部を有するプレス成形品の成形部に対応する孔部が形成され、上記ホルダの孔部には、パンチが進退可能に配置され、上記ダイ及び上記ホルダを互いに接近させて上記繊維強化プラスチック材を挟圧保持した型閉じ状態で、上記パンチを進出させることにより、上記繊維強化プラスチック材を所定形状にプレス成形するプレス成形装置において、次のような解決手段を講じた。 Specifically, a die having a holder surface that holds and holds one surface of a heated fiber-reinforced plastic material in a sheet form in which continuous fibers are combined , and the die is disposed opposite to the die, and the fiber-reinforced plastic material is A holder that holds the other side of the die, and the die and the holder are formed with a hole corresponding to a molded part of a press-molded product having a corner part in the molded part, The fiber reinforced plastic material is brought into a predetermined shape by advancing the punch in a mold-closed state in which the punch is disposed so as to be able to advance and retreat, the die and the holder are brought close to each other and the fiber reinforced plastic material is sandwiched and held. In the press forming apparatus for press forming, the following solution was taken.
すなわち、第１発明では、上記ダイのホルダ部及び上記ホルダの少なくとも一方の孔部周りの上記コーナー部に対応する部分を除く箇所には、型閉じ状態で上記ダイのホルダ部及び上記ホルダの他方とで上記繊維強化プラスチック材を上記成形部の成形開始時から成形終了時に亘って挟圧保持しておく複数の挟持部が互いに離間して設けられ、該各挟持部間の上記コーナー部に対応する箇所には、上記ダイ及び上記ホルダの型閉じ状態で上記パンチが上記ダイの孔部へ進出する際に、上記挟持部に対応する部分を除く箇所から上記孔部に向かって流動する上記繊維強化プラスチック材を上記挟持部に挟持される部分に侵入させないように滞留させる侵入阻止凹部が凹設されていることを特徴とする。 That is, in the first invention, the region other than the corner portion corresponding portion of at least one of the holes around the holder portion and the holder of the die, mold closing state of the die holder portion and the other of the holder And a plurality of holding portions for holding the fiber reinforced plastic material from the start of molding to the end of molding of the molding portion are provided apart from each other, corresponding to the corner portions between the respective clamping portions. When the punch advances into the hole of the die when the die and the holder are closed, the fiber flows toward the hole from a portion other than the portion corresponding to the clamping portion. An intrusion prevention recess for retaining the reinforced plastic material so as not to enter the portion sandwiched between the sandwiching portions is provided.
また、本発明は、成形部にコーナー部を有するプレス成形品の成形方法をも対象とし、次のような解決手段を講じた。 The present invention is also directed to a method for forming a press-formed product having a corner portion in the forming portion, and has taken the following solution.
すなわち、第２の発明は、連続繊維を複合したシート状をなす加熱状態の繊維強化プラスチック材における上記コーナー部の両側に対応する部分を上記成形部の成形開始時から成形終了時に亘って挟圧保持した型閉じ状態で、パンチを進出させることにより、上記繊維強化プラスチック材における上記コーナー部に対応する非挟持部分から上記パンチ側に向かって流動する上記繊維強化プラスチック材を上記挟持部分に侵入させないように上記非挟持部分に滞留させながらプレス成形し、成形部にコーナー部を有するプレス成形品を得ることを特徴とする。 That is, according to the second aspect of the present invention, a portion corresponding to both sides of the corner portion in the heated fiber reinforced plastic material in the form of a sheet composed of continuous fibers is clamped from the start of molding to the end of molding. in the held mold closing state, by advancing the punch, not to penetrate the clamped portion of the fiber-reinforced plastic material to flow toward the punch from the disengagement clamping portion corresponding to the corner portions of the fiber-reinforced plastic material Thus, press molding is performed while staying in the non-clamping portion, and a press-molded product having a corner portion in the molding portion is obtained.
本発明では、成形部のコーナー部に対応する繊維強化プラスチック材が孔部に向かって流動する際に、行き場が無くなっても挟持部に挟持される部分に侵入せずに侵入阻止凹部に滞留するようになる。したがって、挟持部から孔部に向かう材料の流動が孔部周りに略均一となり、成形後のプレス成形品の上記挟持部に対応する部分の繊維が湾曲したり蛇行しなくなるので、成形後のプレス成形品における上記ダイのホルダ部及びホルダの挟持部に対応する部分の物性値の低下を防止することができる。 In the present invention, when the fiber reinforced plastic material corresponding to the corner portion of the molding portion flows toward the hole portion, the fiber reinforced plastic material stays in the intrusion prevention recess portion without entering the portion sandwiched by the sandwiching portion even if there is no place to go. It becomes like this. Accordingly, the flow of the material from the sandwiching portion toward the hole portion is substantially uniform around the hole portion, and the fiber corresponding to the sandwiching portion of the press-formed product after molding does not bend or meander. It is possible to prevent a decrease in physical property values of a portion corresponding to the holder portion of the die and the holding portion of the holder in the molded product.
以下、本発明の実施形態を図面に基づいて詳細に説明する。尚、以下の好ましい実施形態の説明は、本質的に例示に過ぎない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
図１乃至図５は、本発明の実施形態に係るプレス成形装置１を示す。該プレス成形装置１は、連続繊維が複合されたシート状の繊維強化プラスチック材１０（図２参照）を加熱した状態でプレス成形して所定形状のプレス成形品２０（図５及び図７参照）を得る装置であり、床面に設置された略直方体形状の基台３及び該基台３の上方に対向配置された昇降台４を有する装置本体２を備え、図示しない昇降機構により、上記昇降台４は上記基台３に対して上下に昇降可能となっている。 1 to 5 show a press molding apparatus 1 according to an embodiment of the present invention. The press molding apparatus 1 press-molds a sheet-like fiber-reinforced plastic material 10 (see FIG. 2) in which continuous fibers are composited in a heated state and press-molded product 20 having a predetermined shape (see FIGS. 5 and 7). And a device main body 2 having a substantially rectangular parallelepiped base 3 installed on the floor and a lift 4 disposed oppositely above the base 3, and the lift The base 4 can be moved up and down with respect to the base 3.
上記昇降台４下面には、直方体形状のダイ５が取り付けられている。該ダイ５の中央下部には、上方が閉塞するとともに下方に開口するダイ孔部５ａが形成され、該ダイ孔部５ａは、上記プレス成形品２０の成形部２０ａに対応している。 A rectangular parallelepiped die 5 is attached to the lower surface of the lifting platform 4. A die hole portion 5 a that closes and opens downward is formed in the lower center portion of the die 5, and the die hole portion 5 a corresponds to the forming portion 20 a of the press-formed product 20.
また、上記ダイ孔部５ａ開口寄りの内側面には、矩形の環状突条部５ｂが突設され、上記ダイ孔部５ａの開口周りには、型閉じ状態で上記繊維強化プラスチック材１０の上面（一方の面）を挟圧保持するフラットなホルダ面５ｃが設けられている。 A rectangular annular ridge 5b is provided on the inner surface near the opening of the die hole 5a. Around the opening of the die hole 5a, the upper surface of the fiber-reinforced plastic material 10 is closed. A flat holder surface 5c for holding (holding) one surface is provided.
さらに、上記ダイ孔部５ａには、略直方体形状のカウンターパンチ６が上下に進退可能に配置されている。 Further, a substantially rectangular parallelepiped counter punch 6 is disposed in the die hole 5a so as to be able to advance and retreat.
上記カウンターパンチ６下半部分の外周面は、上記環状突条部５ｂの先端位置に対応していて、上記カウンターパンチ６上半部分の外周面より内側に位置しており、上記カウンターパンチ６の上半部分及び下半部分の境目には、段差部６ａが形成されている。そして、上記カウンターパンチ６が下方に進出する際、上記段差部６ａが上記環状突条部５ｂに当接し、上記カウンターパンチ６がそれ以上下方への進出するのを規制するようになっている。 The outer peripheral surface of the lower half portion of the counter punch 6 corresponds to the tip position of the annular ridge 5b and is located inside the outer peripheral surface of the upper half portion of the counter punch 6; A step portion 6a is formed at the boundary between the upper half portion and the lower half portion. When the counter punch 6 advances downward, the stepped portion 6a comes into contact with the annular ridge 5b, thereby restricting the counter punch 6 from moving downward further.
上記ダイ孔部５ａ上方の閉塞部分と上記カウンターパンチ６上端との間には、複数の第１コイルバネ１１が配設され、該各第１コイルバネ１１は上記カウンターパンチ６を下方付勢している。 A plurality of first coil springs 11 are disposed between the closed portion above the die hole portion 5a and the upper end of the counter punch 6, and each of the first coil springs 11 urges the counter punch 6 downward. .
上記基台３は、上側基台３ａと、該上側基台３ａに対向する下側基台３ｂとで構成され、当該上側基台３ａ及び下側基台３ｂの外周には、上記下側基台３ｂに対して上記上側基台３ａを上方付勢する複数の第２コイルバネ１２が互いに離間した位置に取り付けられている。 The base 3 is composed of an upper base 3a and a lower base 3b facing the upper base 3a. The lower base 3b and the lower base 3b are arranged on the outer periphery of the upper base 3a and the lower base 3b. A plurality of second coil springs 12 for urging the upper base 3a upward with respect to the base 3b are attached to positions separated from each other.
上記上側基台３ａの上面中央には、厚みのある略正方形板状のホルダ７が上記ダイ５に対向するように配置され、上記ホルダ７は、型閉じ状態で上記繊維強化プラスチック材１０の下面（他方の面）を挟圧保持するようになっている。 In the center of the upper surface of the upper base 3a, a thick, substantially square plate-shaped holder 7 is disposed so as to face the die 5, and the holder 7 is in a mold-closed state so that the lower surface of the fiber-reinforced plastic material 10 is (The other surface) is held under pressure.
上記上側基台３ａ及び上記ホルダ７の各々の中央部分には、図２乃至図５に示すように、上記ダイ５のダイ孔部５ａに対向する位置に略矩形状の基台孔部３ｃ及びホルダ孔部７ａが互いに連通形成され、当該基台孔部３ｃ及びホルダ孔部７ａは、上記プレス成形品２０の成形部２０ａに対応している。 As shown in FIGS. 2 to 5, the upper base 3 a and the holder 7 each have a substantially rectangular base hole 3 c at a position facing the die hole 5 a of the die 5. The holder hole portion 7 a is formed in communication with each other, and the base hole portion 3 c and the holder hole portion 7 a correspond to the forming portion 20 a of the press-formed product 20.
上記ホルダ７上面の上記ホルダ孔部７ａ周りには、上記ダイ５及び上記ホルダ７の型閉じ状態で上記ダイ５のホルダ面５ｃとで上記繊維強化プラスチック材１０を上記成形部２０ａの成形開始時から成形終了時に亘って挟圧保持しておく４つの挟持部７ｂが互いに離間して設けられている。 Around the holder hole 7a on the upper surface of the holder 7, the fiber reinforced plastic material 10 is started to be molded with the holder surface 5c of the die 5 with the die 5 and the holder 7 closed. four clamping portions 7b to keep clamp held through to completion of molding from are provided apart from each other.
該挟持部７ｂは、平面視で略矩形状をなしていて、上記ホルダ孔部７ａの各辺に対応する位置にそれぞれ設けられている。 The clamping part 7b has a substantially rectangular shape in plan view, and is provided at a position corresponding to each side of the holder hole part 7a.
上記各挟持部７ｂの間、すなわち、上記ホルダ７の四隅には、平面視で略矩形状の侵入阻止凹部７ｃが凹設されている。 Between the holding portions 7b, that is, at the four corners of the holder 7, intrusion prevention recesses 7c having a substantially rectangular shape in a plan view are provided.
上記基台孔部３ｃ及びホルダ孔部７ａには、上端に成形面８ａを有する略直方体形状のパンチ８が進退可能に配置され、該パンチ８の下端は上記下側基台３ｂに固定されている。 In the base hole portion 3c and the holder hole portion 7a, a substantially rectangular parallelepiped punch 8 having a molding surface 8a at the upper end is disposed so as to be able to advance and retreat, and the lower end of the punch 8 is fixed to the lower base 3b. Yes.
そして、型開き状態の上記ダイ５及びホルダ７間に加熱した上記繊維強化プラスチック材１０を搬入した状態で、図示しない昇降機構により、上記昇降台４を下降させて上記ダイ５及びホルダ７を互いに接近させることにより、上記繊維強化プラスチック材１０を上記ダイ５のホルダ面５ｃ及びホルダ７の各挟持部７ｂで挟圧保持するようになっている。 Then, in a state where the heated fiber reinforced plastic material 10 is carried between the die 5 and the holder 7 in the mold open state, the lifting platform 4 is lowered by an elevator mechanism (not shown) so that the die 5 and the holder 7 are mutually connected. By bringing them closer, the fiber reinforced plastic material 10 is clamped and held by the holder surface 5 c of the die 5 and the clamping portions 7 b of the holder 7.
また、上記ダイ５及びホルダ７の型閉じ状態で、図示しない昇降機構により、さらに上記昇降台４を下降させると、上記各第２コイルバネ１２の付勢力に抗して上記上側基台３ａが下方に移動することにより上記パンチ８が上記ダイ孔部５ａに進出するようになっていて、上記パンチ８の上記ダイ孔部５ａへの進出動作により、上記繊維強化プラスチック材１０を所定形状にプレス成形するようになっている。 When the die 5 and the holder 7 are closed, when the elevator 4 is further lowered by an elevator mechanism (not shown), the upper base 3a is moved downward against the urging force of the second coil springs 12. The punch 8 advances into the die hole 5a by moving to the die hole 5a, and the fiber reinforced plastic material 10 is pressed into a predetermined shape by the advance operation of the punch 8 into the die hole 5a. It is supposed to be.
さらに、上記ダイ５及びホルダ７の型閉じ状態で上記パンチ８が上記ダイ５のダイ孔部５ａへ進出する際に、上記繊維強化プラスチック材１０の上記挟持部７ｂに対応する部分を除く箇所（非挟持部分１０ａ）から上記ホルダ孔部７ａに向かって流動する上記繊維強化プラスチック材１０を上記挟持部７ｂに挟持される部分（挟持部分１０ｂ）に侵入させないように上記各侵入阻止凹部７ｃに滞留させるようになっている。 Further, when the punch 8 advances into the die hole portion 5a of the die 5 with the die 5 and the holder 7 closed, a portion excluding a portion corresponding to the sandwiching portion 7b of the fiber reinforced plastic material 10 ( The fiber reinforced plastic material 10 that flows from the non-clamping part 10a) toward the holder hole 7a stays in each intrusion prevention recess 7c so as not to enter the part (clamping part 10b) held by the clamping part 7b. It is supposed to let you.
次に、上記プレス成形装置１でシート状の繊維強化プラスチック材１０からプレス成形品２０を成形する方法について説明する。 Next, a method for forming the press-formed product 20 from the sheet-like fiber-reinforced plastic material 10 with the press-forming apparatus 1 will be described.
まず、上記繊維強化プラスチック材１０を図示しない加熱炉等で加熱した後、図２に示すように、型開きしたダイ５及びホルダ７間に搬入して当該ホルダ７上に載置する。 First, after heating the fiber reinforced plastic material 10 in a heating furnace or the like (not shown), the fiber reinforced plastic material 10 is loaded between the die 5 and the holder 7 which are opened as shown in FIG.
次に、図示しない昇降機構により、昇降台４を下降させて上記ダイ５を上記ホルダ７に接近させる。すると、図３に示すように、上記ダイ５のホルダ面５ｃが上記繊維強化プラスチック材１０の上面に接触するとともに、上記ホルダ７の各挟持部７ｂが上記繊維強化プラスチック材１０の下面に接触して、当該繊維強化プラスチック材１０を上記ホルダ面５ｃ及び上記各挟持部７ｂで挟圧保持する。 Next, the lifting platform 4 is lowered by the lifting mechanism (not shown) to bring the die 5 closer to the holder 7. Then, as shown in FIG. 3, the holder surface 5 c of the die 5 comes into contact with the upper surface of the fiber reinforced plastic material 10, and each clamping portion 7 b of the holder 7 comes into contact with the lower surface of the fiber reinforced plastic material 10. Then, the fiber reinforced plastic material 10 is clamped and held by the holder surface 5c and the clamping portions 7b.
しかる後、図示しない昇降機構により、さらに昇降台４をさらに下降させると、図４に示すように、ダイ５のホルダ面５ｃが繊維強化プラスチック材１０を介してホルダ７を下方に押し下げる。 Thereafter, when the elevator 4 is further lowered by an elevator mechanism (not shown), the holder surface 5c of the die 5 pushes the holder 7 downward through the fiber reinforced plastic material 10 as shown in FIG.
すると、該ホルダ７及び上側基台３ａが上記各第２コイルバネ１２の付勢力に抗して下方に移動するのに伴って、上記パンチ８が上記ダイ孔部５ａに進出するとともに、繊維強化プラスチック材１０の反パンチ８側に接触するカウンターパンチ６が上記各第１コイルバネ１１の付勢力に抗して上方に移動することにより、図５に示すように、成形部２０ａを有するプレス成形品２０を得る。 Then, as the holder 7 and the upper base 3a move downward against the urging force of each of the second coil springs 12, the punch 8 advances into the die hole 5a and fiber reinforced plastic. The counter punch 6 that contacts the counter punch 8 side of the material 10 moves upward against the urging force of each of the first coil springs 11, so that a press-formed product 20 having a forming portion 20a as shown in FIG. Get.
このとき、上記各挟持部７ｂは、上記繊維強化プラスチック材１０を成形開始時から成形終了時に亘って挟圧保持していて、上記繊維強化プラスチック材１０の上記各挟持部７ｂに対応する部分を除く箇所（非挟持部分１０ａ）から上記ホルダ孔部７ａに向かって流動する上記繊維強化プラスチック材１０を上記挟持部７ｂに挟持される部分（挟持部分１０ｂ）に侵入させないように上記各侵入阻止凹部７ｃに滞留させる。 At this time, each of the holding portions 7b holds the fiber reinforced plastic material 10 from the start of molding to the end of molding and holds a portion corresponding to each of the holding portions 7b of the fiber reinforced plastic material 10. The intrusion prevention recesses described above so that the fiber-reinforced plastic material 10 flowing from the removed portion (non-clamping portion 10a) toward the holder hole 7a does not enter the portion (clamping portion 10b) held by the clamping portion 7b. Retain in 7c.
その後、図示しない戻り止め機構により上側基台３ａを固定するとともに、図示しない昇降機構により昇降台４を上昇させる。すると、上記ホルダ７からダイ５が離間するとともに、上記カウンターパンチ６が上記各第１コイルバネ１１の付勢力で下方に移動して段差部６ａが上記環状突条部５ｂに当接する。 Thereafter, the upper base 3a is fixed by a detent mechanism (not shown) and the elevator 4 is raised by an elevator mechanism (not shown). Then, the die 5 is separated from the holder 7, and the counter punch 6 is moved downward by the urging force of the first coil springs 11, so that the stepped portion 6 a comes into contact with the annular protrusion 5 b.
しかる後、型開きした状態のダイ５及びホルダ７間からプレス成形品２０を搬出してプレス成形を終了する。 Thereafter, the press-formed product 20 is taken out from between the die 5 and the holder 7 in a state where the mold is opened, and the press molding is finished.
次に、本発明のプレス成形装置１を用いて実験した結果について説明する。 Next, the results of experiments using the press molding apparatus 1 of the present invention will be described.
図６は、シート状の熱可塑性繊維強化プラスチック材１０（板厚：１ｍｍ、２辺の各長さ：１４０ｍｍ）を上記プレス成形装置１でプレス成形して、扁平な直方体形状の成形部２０ａ（高さ：２０ｍｍ、２辺の各長さ：６０ｍｍ）を成形した結果を示す。 FIG. 6 shows a sheet-shaped thermoplastic fiber reinforced plastic material 10 (plate thickness: 1 mm, length of each side: 140 mm) is press-molded by the press-molding apparatus 1 to form a flat rectangular parallelepiped shaped molded portion 20a ( The results of molding a height of 20 mm and each length of two sides: 60 mm are shown.
矢印Ｃの部分、すなわち、繊維強化プラスチック材１０の上記各挟持部７ｂに対応する部分は、繊維が真っ直ぐなままで、成形前後で繊維配向が変化していない。これは、プレス成形時において、図６（ｂ）に示すように、成形部２０ａのコーナー部に対応する部分（Ｄ部分）の行き場のない材料が矢印Ｘ１のように移動してＣ１部分に侵入することなく滞留するからだと考えられる。 In the portion indicated by the arrow C, that is, the portion corresponding to each sandwiching portion 7b of the fiber reinforced plastic material 10, the fiber remains straight and the fiber orientation does not change before and after molding. This is because, during press molding, as shown in FIG. 6 (b), the material without the destination of the portion (D portion) corresponding to the corner portion of the forming portion 20a moves as indicated by the arrow X1 and enters the C1 portion. It is thought that it is because it stays without doing.
一方、図７は、シート状の熱可塑性繊維強化プラスチック材１０（板厚：１ｍｍ、２辺の各長さ：１４０ｍｍ）を従来のプレス成形装置でプレス成形して、扁平な直方体形状の成形部２０ａ（高さ：２０ｍｍ、２辺の各長さ：６０ｍｍ）を成形した結果を示す。 On the other hand, FIG. 7 shows a sheet-shaped thermoplastic fiber reinforced plastic material 10 (plate thickness: 1 mm, each length of each side: 140 mm) formed by a conventional press-forming apparatus to form a flat rectangular parallelepiped-shaped molded part. The result of molding 20a (height: 20 mm, each side length: 60 mm) is shown.
この実験結果では、成形後に矢印Ｅの部分の繊維が大きく湾曲することを確認した。 In this experimental result, it was confirmed that the fiber in the portion indicated by the arrow E was greatly curved after molding.
以上より、本発明では、成形部２０ａのコーナー部に対応する繊維強化プラスチック材１０がホルダ孔部７ａに向かって流動する際に、行き場が無くなっても各挟持部７ｂに挟圧保持される部分に侵入せず侵入阻止凹部７ｃに滞留するようになる。したがって、各挟持部７ｂからホルダ孔部７ａに向かう繊維強化プラスチック材１０の流動がホルダ孔部７ａ周りに略均一となり、成形後のプレス成形品２０の上記挟持部７ｂに対応する部分の繊維が湾曲したり蛇行しなくなるので、成形後のプレス成形品２０における上記ダイ５のホルダ面５ｃ及びホルダ７の挟持部７ｂに対応する部分の物性値の低下を防止することができる。 As described above, in the present invention, when the fiber reinforced plastic material 10 corresponding to the corner portion of the molded portion 20a flows toward the holder hole portion 7a, the portion that is pinched and held by each of the pinching portions 7b even when there is no place to go. Does not penetrate into the intrusion prevention recess 7c. Therefore, the flow of the fiber reinforced plastic material 10 from each clamping part 7b toward the holder hole part 7a becomes substantially uniform around the holder hole part 7a, and the fibers in the portion corresponding to the clamping part 7b of the press-molded product 20 after molding. Since it does not curve or meander, it is possible to prevent a decrease in physical property values of the portion corresponding to the holder surface 5c of the die 5 and the holding portion 7b of the holder 7 in the press-formed product 20 after molding.
図８は、本発明の実施形態の変形例を示す。この変形例では、以下の点が上記で詳述した実施形態と異なっている。すなわち、変形例のホルダ７上面には、ホルダ孔部７ａの４つの角部から外側方に略Ｌ字状に延びる４つの溝状の侵入阻止凹部７ｄが凹設され、上記ホルダ７の四隅に平面視で略矩形状の挟持部７ｅが設けられている。尚、上記侵入阻止凹部７ｄは、プレス成形時に繊維強化プラスチック材１０が特に行き場を無くす部分（集まり易い部分）に対応している。 FIG. 8 shows a modification of the embodiment of the present invention. In this modification, the following points are different from the embodiment described in detail above. That is, on the upper surface of the holder 7 according to the modified example, four groove-shaped intrusion prevention recesses 7 d extending in an approximately L shape outward from the four corners of the holder hole 7 a are provided in the four corners of the holder 7. A substantially rectangular holding part 7e is provided in plan view. The intrusion prevention recess 7d corresponds to a portion where the fiber reinforced plastic material 10 particularly loses its place during press molding (a portion that tends to gather).
そして、上記ダイ５及びホルダ７の型閉じ状態で上記パンチ８が上記ダイ５のダイ孔部５ａへ進出する際に、上記繊維強化プラスチック材１０の上記挟持部７ｂに対応する部分を除く箇所から上記ホルダ孔部７ａに向かって流動する上記繊維強化プラスチック材１０を上記挟持部７ｂ、７ｅに挟持される部分に侵入させないように上記各侵入阻止凹部７ｄに滞留させるようになっている。 When the punch 8 advances into the die hole portion 5a of the die 5 with the die 5 and the holder 7 closed, the portion except for the portion corresponding to the sandwiching portion 7b of the fiber reinforced plastic material 10 is removed. The fiber reinforced plastic material 10 that flows toward the holder hole 7a is retained in each of the intrusion prevention recesses 7d so as not to enter the portions sandwiched by the sandwiching portions 7b and 7e.
尚、変形例のプレス成形装置１を用いて繊維強化プラスチック材１０をプレス成形する方法は、上記繊維強化プラスチック材１０の上記各挟持部７ｂに対応する部分を除く箇所から上記ホルダ孔部７ａに向かって流動する上記繊維強化プラスチック材１０を上記挟持部７ｂに挟持される部分に侵入させないようにするのが侵入阻止凹部７ｃではなく侵入阻止凹部７ｄである点が実施形態１と異なるだけで、その他は実施形態１と同じであるので、詳細な説明は省略する。 In addition, the method of press-molding the fiber reinforced plastic material 10 using the press molding apparatus 1 according to the modified example is such that the holder hole portion 7a is moved from a portion excluding a portion corresponding to each sandwiching portion 7b of the fiber reinforced plastic material 10. The only difference from Embodiment 1 is that the fiber-reinforced plastic material 10 that flows toward the sandwiched portion 7b is prevented from entering the portion sandwiched by the sandwiched portion 7b but the intrusion preventive recess 7d, not the intrusion preventive recess 7d. Since others are the same as Embodiment 1, detailed description is abbreviate | omitted.
したがって、本発明の変形例では、シート状の繊維強化プラスチック材１０から直方体形状の成形部２０ａを成形する際、繊維強化プラスチック材１０が特に行き場を無くす部分（集まりやすい部分）にだけ対応するように侵入阻止凹部７ｄを設けても、上述の実施形態と同様の効果を得ることができる。 Therefore, in the modified example of the present invention, when the rectangular parallelepiped shaped molded portion 20a is formed from the sheet-like fiber reinforced plastic material 10, the fiber reinforced plastic material 10 particularly corresponds only to a portion where a place to go is lost (a portion that tends to gather). Even if the intrusion prevention recess 7d is provided in the above, the same effect as in the above-described embodiment can be obtained.
尚、本発明では、侵入阻止凹部７ｃ、７ｄをホルダ７に設けているが、ダイ５のホルダ面５ｃに設けてもいいし、ダイ５及びホルダ７の両方に設けてもよい。 In the present invention, the intrusion prevention recesses 7 c and 7 d are provided on the holder 7, but may be provided on the holder surface 5 c of the die 5 or on both the die 5 and the holder 7.
本発明は、連続繊維を複合したシート状の繊維強化プラスチック材をプレス成形するプレス成形装置及び繊維強化プラスチック材からなるプレス成形品の成形方法に適している。 INDUSTRIAL APPLICABILITY The present invention is suitable for a press molding apparatus that press-molds a sheet-like fiber-reinforced plastic material that is a composite of continuous fibers, and a method for molding a press-molded product that includes a fiber-reinforced plastic material.
１ プレス成形装置
５ ダイ
５ａ ダイ孔（孔部）
５ｃ ホルダ面
７ ホルダ
７ａ ホルダ孔（孔部）
７ｂ 挟持部
７ｃ、７ｄ 侵入阻止凹部
８ パンチ
１０ 繊維強化プラスチック材
１０ａ 非挟持部分
１０ｂ 挟持部分
２０ プレス成形品
２０ａ 成形部
1 Press forming device 5 Die 5a Die hole (hole)
5c Holder surface 7 Holder 7a Holder hole (hole)
7b Clamping part 7c, 7d Intrusion prevention concave part 8 Punch 10 Fiber reinforced plastic material 10a Non-clamping part 10b Clamping part 20 Press molded product 20a Molding part
Claims (2)
該ダイに対向配置され、上記繊維強化プラスチック材の他方の面を挟圧保持するホルダとを備え、
上記ダイ及びホルダには、成形部にコーナー部を有するプレス成形品の成形部に対応する孔部が形成され、
上記ホルダの孔部には、パンチが進退可能に配置され、
上記ダイ及び上記ホルダを互いに接近させて上記繊維強化プラスチック材を挟圧保持した型閉じ状態で、上記パンチを進出させることにより、上記繊維強化プラスチック材を所定形状にプレス成形するプレス成形装置であって、
上記ダイのホルダ部及び上記ホルダの少なくとも一方の孔部周りの上記コーナー部に対応する部分を除く箇所には、型閉じ状態で上記ダイのホルダ部及び上記ホルダの他方とで上記繊維強化プラスチック材を上記成形部の成形開始時から成形終了時に亘って挟圧保持しておく複数の挟持部が互いに離間して設けられ、
該各挟持部間の上記コーナー部に対応する箇所には、上記ダイ及び上記ホルダの型閉じ状態で上記パンチが上記ダイの孔部へ進出する際に、上記挟持部に対応する部分を除く箇所から上記孔部に向かって流動する上記繊維強化プラスチック材を上記挟持部に挟持される部分に侵入させないように滞留させる侵入阻止凹部が凹設されていることを特徴とするプレス成形装置。 A die having a holder surface that holds and holds one surface of a fiber-reinforced plastic material in a heated state that forms a sheet formed by combining continuous fibers ;
A holder that is disposed opposite to the die and holds the other surface of the fiber-reinforced plastic material.
The die and the holder are formed with a hole corresponding to a molded part of a press-formed product having a corner part in the molded part,
In the hole of the holder, a punch is disposed so as to be able to advance and retreat,
The press molding apparatus is configured to press-mold the fiber-reinforced plastic material into a predetermined shape by moving the punch in a closed state in which the die and the holder are brought close to each other and the fiber-reinforced plastic material is clamped and held. And
The fiber reinforced plastic material between the holder part of the die and the other of the holder in a mold-closed state except for the part corresponding to the corner part around the hole part of the die and the holder of the die. A plurality of clamping parts that hold the clamping pressure from the start of molding of the molding part to the end of molding are provided apart from each other,
The part corresponding to the corner part between the holding parts is a part excluding the part corresponding to the holding part when the punch advances into the hole part of the die with the die and the holder closed. An intrusion prevention recess for retaining the fiber-reinforced plastic material flowing from the hole toward the hole so as not to enter the portion held by the holding portion is provided.
連続繊維を複合したシート状をなす加熱状態の繊維強化プラスチック材における上記コーナー部の両側に対応する部分を上記成形部の成形開始時から成形終了時に亘って挟圧保持した型閉じ状態で、
パンチを進出させることにより、上記繊維強化プラスチック材における上記コーナー部に対応する非挟持部分から上記パンチ側に向かって流動する上記繊維強化プラスチック材を上記挟持部分に侵入させないように上記非挟持部分に滞留させながらプレス成形し、成形部にコーナー部を有するプレス成形品を得ることを特徴とするプレス成形品の成形方法。 A molding method of a press-molded product having a corner portion in a molding portion,
In the mold closed state in which the portions corresponding to both sides of the corner portion in the heated fiber reinforced plastic material in the form of a sheet composed of continuous fibers are clamped and held from the start of molding to the end of molding ,
By advancing the punch, the fiber-reinforced plastic material to flow toward the punch from the disengagement clamping portion corresponding to the corner portions of the fiber-reinforced plastic material to the non-clamping portion so as not to penetrate into the clamping portion A method for forming a press-molded product, wherein the press-molded product is obtained by press-molding while retaining to obtain a press-molded product having a corner portion in a molded part.
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