JPH06335934A - Shock-absorbing member with flange part and method for molding the same - Google Patents
Shock-absorbing member with flange part and method for molding the sameInfo
- Publication number
- JPH06335934A JPH06335934A JP5127017A JP12701793A JPH06335934A JP H06335934 A JPH06335934 A JP H06335934A JP 5127017 A JP5127017 A JP 5127017A JP 12701793 A JP12701793 A JP 12701793A JP H06335934 A JPH06335934 A JP H06335934A
- Authority
- JP
- Japan
- Prior art keywords
- absorbing member
- flange portion
- fiber
- shock absorbing
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車のバンパー、バ
ンパービーム、グローブボックス等、衝突時における高
度の衝撃吸収性能が要求される部材に適した繊維強化複
合材料製のフランジ部を有する衝撃吸収部材及びその成
形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber having a flange portion made of a fiber-reinforced composite material, which is suitable for a member such as a bumper, a bumper beam, a glove box of an automobile, which is required to have a high shock absorbing performance at the time of collision. The present invention relates to a member and a method for forming the member.
【０００２】[0002]
【従来の技術】従来、自動車のバンパー、バンパービー
ム、グローブボックス等、衝突時における高度の衝撃吸
収性能が要求される部材用素材の一つとして、熱可塑性
樹脂と強化用繊維からなる繊維強化複合材料シートが用
いられている。このような繊維強化複合材料シートは熱
可塑性樹脂の融点又は軟化点以上の温度に予熱され、一
対の雄雌型の間で比較的高圧下にプレス成形されて、概
ね均一な密度を有する各種の衝撃吸収部材に成形されて
いる。2. Description of the Related Art Conventionally, a fiber reinforced composite material composed of a thermoplastic resin and a reinforcing fiber has been used as a material for a member such as an automobile bumper, a bumper beam, a glove box, etc., which is required to have a high impact absorption performance at the time of collision. Material sheets are used. Such a fiber-reinforced composite material sheet is preheated to a temperature equal to or higher than the melting point or softening point of the thermoplastic resin, press-molded under a relatively high pressure between a pair of male and female molds, and has various kinds of uniform density. It is molded into a shock absorbing member.
【０００３】[0003]
【発明が解決しようとする課題】このようにして成形さ
れた各種の衝撃吸収部材は、軽量性、不錆性等の長所が
あることから、しかも、耐熱性や寸法安定性についても
逐次改良がなされてきて、金属製等の衝撃吸収部材の代
替として広く利用されるようになってきた。しかし、該
衝撃吸収部材は、 外力を受けた時、素材の伸びが小さい。従って、衝
突時に比較的小変位の力が与えられた場合においても破
壊し易いこと。 外力を受けた時、応力集中を生じ易い。例えば、衝
突時に衝撃吸収部材の中央部、或いは、衝撃吸収部材を
車のボディーを固定するためのボルトによる締め付け部
分、すなわち、フランジ部等にて破壊し易い。 等の欠点を有し、それらの点に付いての改良が望まれて
いる。The various shock-absorbing members molded in this manner have advantages such as lightness and rust resistance, and moreover, heat resistance and dimensional stability can be improved successively. It has been widely used as a substitute for a shock absorbing member made of metal or the like. However, when the impact absorbing member receives an external force, the elongation of the material is small. Therefore, even if a relatively small displacement force is applied at the time of collision, it is easy to break. When an external force is applied, stress concentration is likely to occur. For example, at the time of a collision, the central portion of the shock absorbing member or the tightening portion of the shock absorbing member with a bolt for fixing the body of the vehicle, that is, the flange portion is easily broken. There are drawbacks such as the above, and improvements in these points are desired.
【０００４】[0004]
［発明の概要］本発明者らは、上記問題点に鑑みて鋭意
研究を重ねた結果、熱可塑性樹脂と強化用繊維からなる
繊維強化複合材料シートを成形して得られる衝撃吸収部
材の密度、特に実際に衝突時の衝撃を吸収する衝撃吸収
部材の本体部分の密度を、理論値より小さくすること、
すなわち、衝撃吸収部材の本体部分を多孔質にすること
により、衝突時の応力集中を起こり難くすることによっ
て、上述の問題点を解決することができるとの知見を得
て、本発明を完成するに至ったものである。すなわち、
本発明のフランジ部を有する衝撃吸収部材は、熱可塑性
樹脂と強化用繊維からなる繊維強化複合材料シートから
成形されたフランジ部を有する衝撃吸収部材であって、
該衝撃吸収部材の本体部分の密度をフランジ部の密度に
対して０．５０〜０．９１の比率としたことを特徴とす
るものである。また、本発明のもう一方の発明であるフ
ランジ部を有する衝撃吸収部材の成形方法は、熱可塑性
樹脂と強化用繊維からなる繊維強化複合材料シートを熱
可塑性樹脂の融点又は軟化点以上の温度に予熱し、一対
の金型の間に載置した後、該金型の第１段階の型締めに
よって先ず成形品のフランジ部に相当する部分を加圧成
形し、次いで、第２段階の型締めによって成形品の本体
部分に相当する部分を第１段階における圧力以下にて加
圧成形することにより、本体部分の密度をフランジ部の
密度よりも小さくなるように成形することを特徴とする
ものである。[Summary of the Invention] The present inventors have conducted intensive studies in view of the above problems, and as a result, the density of an impact absorbing member obtained by molding a fiber-reinforced composite material sheet composed of a thermoplastic resin and reinforcing fibers, Especially, the density of the main body of the shock absorbing member that actually absorbs the shock at the time of collision should be smaller than the theoretical value,
That is, by making the main body of the shock absorbing member porous so that stress concentration at the time of collision is less likely to occur, the above-mentioned problems can be solved, and the present invention is completed. It came to. That is,
A shock absorbing member having a flange portion of the present invention is a shock absorbing member having a flange portion formed from a fiber reinforced composite material sheet made of a thermoplastic resin and reinforcing fibers,
The density of the main body portion of the shock absorbing member is set to a ratio of 0.50 to 0.91 with respect to the density of the flange portion. Further, the method of molding a shock absorbing member having a flange portion which is the other invention of the present invention, a fiber-reinforced composite material sheet comprising a thermoplastic resin and reinforcing fibers to a temperature above the melting point or softening point of the thermoplastic resin. After preheating and placing it between a pair of molds, the first stage of mold clamping of the mold first press-molds a portion corresponding to the flange portion of the molded product, and then the second stage mold clamping. According to the present invention, a portion corresponding to the main body portion of the molded product is pressure-molded at a pressure equal to or lower than the pressure in the first stage so that the density of the main body portion is smaller than the density of the flange portion. is there.
【０００５】［発明の具体的説明］ [I] フランジ部を有する衝撃吸収部材 (1) 原材料成分 (a) 熱可塑性樹脂 本発明のフランジ部を有する衝撃吸収部材及びその成形
方法において用いられる熱可塑性樹脂としては、ポリエ
チレン、ポリプロピレン、ポリスチレン、ポリ塩化ビニ
ル、ＡＢＳ樹脂、ＳＡＮ樹脂、ポリアミド、ポリカーボ
ネート、ポリアセタール、ポリエチレンテレフタレー
ト、ポリブチレンテレフタレート、ポリフェニレンオキ
シッド、ポリスルホン、ポリフェニレンスルフィド等が
挙げられるが、これらの熱可塑性樹脂は２種類又はそれ
以上の混合物として用いることもでき、更に、これらと
熱硬化性樹脂粉粒体等を混合して用いることもできる。
これら熱可塑性樹脂の中でも、ガラス繊維の改良効果
（強度、剛性、耐久性等の向上）という観点から、ポリ
プロピレン、ポリエステル（ポリエチレンテレフタレー
ト、ポリブチレンテレフタレート）等の結晶性樹脂が好
ましく、成形性、物性及び経済性のバランスからポリプ
ロピレンが特に好ましい。[Detailed Description of the Invention] [I] Impact absorbing member having a flange portion (1) Raw material component (a) Thermoplastic resin Thermoplastic used in the impact absorbing member having a flange portion of the present invention and a molding method thereof Examples of the resin include polyethylene, polypropylene, polystyrene, polyvinyl chloride, ABS resin, SAN resin, polyamide, polycarbonate, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polyphenylene oxid, polysulfone, and polyphenylene sulfide. The plastic resin may be used as a mixture of two or more kinds, and further, these may be mixed with a thermosetting resin powder or the like and used.
Among these thermoplastic resins, crystalline resins such as polypropylene and polyester (polyethylene terephthalate, polybutylene terephthalate) are preferable from the viewpoint of the effect of improving the glass fiber (improvement in strength, rigidity, durability, etc.). Polypropylene is particularly preferred from the standpoint of economic balance.
【０００６】(b) 強化用繊維 本発明のフランジ部を有する衝撃吸収部材及びその成形
方法において用いられる強化用繊維としては、ガラス繊
維、炭素繊維、金属繊維の他に、無機繊維、有機繊維等
が用いられるが、ガラス繊維が最も一般的である。もち
ろん、ガラス繊維を主体として、カーボン繊維、アラミ
ッド繊維、金属繊維、セラミックス繊維等の強化用繊維
を本発明の趣旨を逸脱しない範囲内で併用することもで
きる。上記ガラス繊維としては、ガラスチョップドスト
ランドを用いるのが一般的であり、これらチョップドス
トランドの長さは、通常３〜５０ｍｍ、繊維の径は３〜
２５μｍ程度のものである。このガラスチョップドスト
ランドは用途に応じてアミノシランカップリング剤、エ
ポキシシランカップリング剤などのカップリング剤や、
ポリビニルアルコール、ポリ酢酸ビニル、ポリウレタン
等の集束剤等によって表面処理を施したものを用いるこ
とができる。(B) Reinforcing fiber As the reinforcing fiber used in the impact absorbing member having the flange portion of the present invention and the molding method thereof, in addition to glass fiber, carbon fiber, metal fiber, inorganic fiber, organic fiber, etc. Are used, but glass fibers are the most common. Of course, reinforcing fibers such as glass fibers, carbon fibers, aramid fibers, metal fibers, and ceramic fibers can be used together within the range not departing from the gist of the present invention. As the glass fibers, it is common to use glass chopped strands, the length of these chopped strands is usually 3 to 50 mm, and the diameter of the fibers is 3 to
It is about 25 μm. This glass chopped strand is a coupling agent such as aminosilane coupling agent and epoxysilane coupling agent, depending on the application,
Those subjected to surface treatment with a sizing agent such as polyvinyl alcohol, polyvinyl acetate or polyurethane can be used.
【０００７】(c) 配合剤 上記原料成分の他に、必要に応じて、中和剤、酸化防止
剤、加工安定剤、耐熱性改良剤、耐候性改良剤、帯電防
止剤、難燃剤等の添加剤、或いは、流動性改良剤、耐衝
撃性改良材、ポリマーと強化用繊維界面との改質剤、発
泡剤、架橋剤、フィラー等の改質材、或いは、グンジョ
ウ、カドミウムイエロー、ベンガラ、クロムイエロー、
鉛白、チタン白、カーボンブラック、アンバー等の無機
顔料や、アゾ系、トリフェニルメタン系、キノリン系、
アントラキノン系、フタロシアニン系、その他の有機顔
料等の顔料等を配合することができる。これらの配合剤
は熱可塑性樹脂内に高濃度で含ませた微粒子状マスター
バッチとして用いることもできる。(C) Compounding agent In addition to the above raw material components, if necessary, a neutralizing agent, an antioxidant, a processing stabilizer, a heat resistance improver, a weather resistance improver, an antistatic agent, a flame retardant, etc. Additives, or flow improvers, impact modifiers, modifiers between the polymer and the fiber interface for reinforcement, foaming agents, cross-linking agents, modifiers such as fillers, or Gunjou, Cadmium Yellow, red iron oxide, Chrome yellow,
Inorganic pigments such as lead white, titanium white, carbon black, amber, azo type, triphenylmethane type, quinoline type,
Pigments such as anthraquinone type, phthalocyanine type and other organic pigments can be blended. These compounding agents can also be used as a fine particle masterbatch containing a high concentration in a thermoplastic resin.
【０００８】(2) 配合割合 本発明のフランジ部を有する衝撃吸収部材を構成する熱
可塑性樹脂と強化用繊維からなる繊維強化複合材料シー
トは、上記熱可塑性樹脂と強化用繊維との配合割合が、
熱可塑性樹脂７５〜４５重量％に対して強化用繊維２５
〜５５重量％、好ましくは熱可塑性樹脂７０〜５０重量
％に対して強化用繊維３０〜５０重量％、特に好ましく
は熱可塑性樹脂６５〜５５重量％に対して強化用繊維３
５〜４５重量％としたものである。熱可塑性樹脂の配合
割合が上記範囲より大きいと、得られる複合材料の強度
・剛性が不足して、複合材料としての意味が薄れる。ま
た、上記範囲より少ないと得られる複合材料の成形性、
耐衝撃性、外観が不良となる。(2) Mixing ratio A fiber-reinforced composite material sheet comprising a thermoplastic resin and a reinforcing fiber constituting the impact absorbing member having a flange portion of the present invention has a mixing ratio of the above-mentioned thermoplastic resin and the reinforcing fiber. ,
Reinforcing fiber 25 to thermoplastic resin 75 to 45% by weight
To 55% by weight, preferably 70 to 50% by weight of the thermoplastic resin, 30 to 50% by weight of the reinforcing fiber, and particularly preferably 65 to 55% by weight of the thermoplastic resin, 3 of the reinforcing fiber.
It is 5 to 45% by weight. If the blending ratio of the thermoplastic resin is larger than the above range, the strength and rigidity of the obtained composite material will be insufficient, and the meaning of the composite material will be diminished. Further, the moldability of the composite material obtained when less than the above range,
Poor impact resistance and appearance.
【０００９】(3) 構 造 本発明のフランジ部を有する衝撃吸収部材の構造は、衝
突時における高度の衝撃吸収性能が要求される部材であ
り、特にフランジ部を有する以外は各種用途に応じて種
々の形状に形成されたものである。具体的には、自動車
のバンパー、バンパービーム、グローブボックス等を挙
げることができる。フランジ部と本体部分の密度比 本発明のフランジ部を有する衝撃吸収部材においては、
フランジ部と本体部分の密度比を特定な値とすることが
重要である。フランジ部を有する衝撃吸収部材の本体部
分の密度をフランジ部の密度を１とすると、０．５０〜
０．９１、好ましくは０．６７〜０．８３とする。この
値が上記範囲未満では衝突時の応力集中を避ける効果が
小さく、上記範囲を超えると部材そのものの強度が不足
して衝撃吸収部材としての機能を失う。(3) Structure The structure of the shock absorbing member having the flange portion of the present invention is a member that requires a high level of shock absorbing performance at the time of collision, and is suitable for various applications except that it has the flange portion. It is formed in various shapes. Specific examples include automobile bumpers, bumper beams, and glove boxes. Density ratio of flange portion and main body portion In a shock absorbing member having a flange portion of the present invention,
It is important to set the density ratio between the flange portion and the main body portion to a specific value. Assuming that the density of the main body of the shock absorbing member having the flange portion is 1, the density of the flange portion is 0.50.
It is 0.91, preferably 0.67 to 0.83. If this value is less than the above range, the effect of avoiding stress concentration at the time of collision is small, and if it exceeds the above range, the strength of the member itself is insufficient and the function as a shock absorbing member is lost.
【００１０】[II] フランジ部を有する衝撃吸収部材の
成形 (1) 繊維強化複合材料シートの製造 (a) シートの成形方法 本発明のフランジ部を有する衝撃吸収部材を製造するた
めに用いられる上記熱可塑性樹脂をベースポリマーと
し、強化用繊維を含有する繊維強化複合材料シート（不
織布状ウェブの製造）の製造方法としては、一般的に、 ａ） 強化用繊維のマットに溶融状態の熱可塑性樹脂を
含浸させ、加圧・冷却して繊維強化複合材料シートを製
造する方法（ラミネート法） ｂ） 熱可塑性樹脂粉粒体（例えば、粒径０．１〜０．
５ｍｍ）と一定長さの強化用繊維（例えば、３〜５０ｍ
ｍの強化用繊維のチョップドストランド）を２軸のリボ
ンブレンダー等の混合機に投入してブレンドすることに
より混合・分散された混合物をウェブ状となし、加熱・
加圧・冷却して繊維強化複合材料シートを製造する方法
（乾式分散法） ｃ） 熱可塑性樹脂粉粒体（例えば、粒径０．１〜０．
５ｍｍ）と一定長さの強化用繊維（例えば、３〜５０ｍ
ｍの強化用繊維のチョップドストランド）を水中又は水
泡中で均一に混合・分散させた後、抄造法によりウェブ
状となし、必要に応じて乾燥した後、加熱・加圧・冷却
して繊維強化複合材料シートを製造する方法（湿式分散
法） 等を挙げることができる。[II] Molding of impact absorbing member having flange portion (1) Production of fiber-reinforced composite material sheet (a) Sheet forming method The above-mentioned method used for producing the impact absorbing member having a flange portion of the present invention. As a method for producing a fiber-reinforced composite material sheet (manufacturing a nonwoven web) containing a reinforcing resin as a base polymer, generally, a) a thermoplastic resin in a molten state on a mat of reinforcing fibers is used. Of the fiber-reinforced composite material sheet (lamination method) by impregnating with, and applying pressure / cooling b) Thermoplastic resin particles (for example, a particle size of 0.1 to 0.
5 mm) and a certain length of reinforcing fiber (for example, 3 to 50 m)
The chopped strands of reinforcing fiber (m) are put into a mixer such as a biaxial ribbon blender and blended to form a mixed / dispersed mixture into a web, which is heated.
Method for producing a fiber-reinforced composite material sheet by pressurizing and cooling (dry dispersion method) c) Thermoplastic resin particles (for example, a particle size of 0.1 to 0.
5 mm) and a certain length of reinforcing fiber (for example, 3 to 50 m)
(chopped strand of reinforcing fiber of m) is uniformly mixed / dispersed in water or water bubbles, then formed into a web by a papermaking method, and dried if necessary, and then heated / pressurized / cooled to reinforce the fiber. Examples thereof include a method for producing a composite material sheet (wet dispersion method).
【００１１】本発明のフランジ部を有する衝撃吸収部材
及びその成形方法において用いられる繊維強化複合材料
シートは、上記製造方法のいずれにも制約されない方法
で製造することができるが、 ａ） 強化用繊維の分散が均一になって安定した高品質
の物性が得られること、 ｂ） シートを成形に先だって予熱した際に、シートの
厚み方向の膨脹が大きいこと、 等の観点から、上記乾式又は湿式分散法を採用すること
が好ましく、強化用繊維の分散が極めて均一で、強度・
剛性・寸法特性等の諸物性のバランスが優れている湿式
分散法を用いることが特に好ましい。The fiber-reinforced composite material sheet used in the impact-absorbing member having a flange portion and the method for molding the same according to the present invention can be manufactured by a method that is not restricted by any of the above-mentioned manufacturing methods. In order to obtain stable and high-quality physical properties by uniform dispersion of b), and b) When the sheet is preheated prior to molding, the expansion in the thickness direction of the sheet is large. It is preferable to adopt the method because the dispersion of reinforcing fibers is extremely uniform,
It is particularly preferable to use a wet dispersion method which has an excellent balance of physical properties such as rigidity and dimensional characteristics.
【００１２】(b) 肉 厚 上記方法によって得られた繊維強化複合材料シートは、
一般に、通常５００〜５，０００ｇ／ｍ2 の厚みを有す
る。(B) Thickness The fiber-reinforced composite material sheet obtained by the above method is
Generally, it has a thickness of usually 500 to 5,000 g / m 2 .
【００１３】(2) フランジ部を有する衝撃吸収部材の
成形 上記繊維強化複合材料シートを予熱し、プレス成形する
ことによって本発明のフランジ部を有する衝撃吸収部材
が成形される。 (a) 成形方法 (i) １段階型締め法 本発明のフランジ部を有する衝撃吸収部材は、後記２段
階型締めを行なう方法以外にも、図５に示すように、成
形品のフランジ部以外の部分Ｂ（本体側壁部），Ｃ（本
体底部）の密度が成形品のフランジ部に相当する部分Ａ
の密度よりも小さくなるように予め設計した雌型１と雄
型２との間に予熱した繊維強化複合材料シート３を載置
して、１段階で本発明のフランジ部を有する衝撃吸収部
材の成形品を得る方法もある。しかし、このような１段
階で型締めを行なう方法は、後記２段階で型締めを行な
う方法に比較して、型締めの進行と共に予熱された複合
材料シート３が成形品の中央部に寄り集まり、フランジ
部の密度が十分大きくならなかったり、板厚の変動が大
きくなったりするので、品質の劣る製品となり易い。(2) Molding of Impact Absorbing Member Having Flange Portion The impact absorbing member having a flange portion of the present invention is molded by preheating the above-mentioned fiber reinforced composite material sheet and press molding. (a) Molding method (i) One-step mold clamping method In addition to the method of performing two-step mold clamping described later, the impact absorbing member having a flange portion of the present invention is not a flange portion of a molded product as shown in FIG. Part B (main body side wall), C (main body bottom) where the density corresponds to the flange of the molded product A
The preheated fiber-reinforced composite material sheet 3 is placed between the female mold 1 and the male mold 2 which are designed in advance to have a density lower than that of the impact absorbing member having the flange portion of the present invention in one step. There is also a method of obtaining a molded product. However, as compared with the method of performing mold clamping in two stages described below, the preheated composite material sheet 3 gathers in the central portion of the molded product as compared with the method of performing mold clamping in two stages described below. However, the density of the flange portion does not become sufficiently large or the variation of the plate thickness increases, so that the product tends to be inferior in quality.
【００１４】(ii) ２段階型締め法 本発明のフランジ部を有する衝撃吸収部材は、上記１段
階で型締めを行なう方法だけでなく、図２〜４に示すよ
うに、熱可塑性樹脂と強化用繊維からなる繊維強化複合
材料シート３を熱可塑性樹脂の融点又は軟化点以上の温
度に予熱し、これを一対の雄型２・雌型１の両金型の間
に載置した後、先ず第１段階の型締めを行なうことによ
って成形品のフランジ部に相当する部分Ａを加圧成形し
た後、次いで、第２段階の型締めを行なうことによって
成形品の本体部分に相当する部分Ｂ，Ｃを上記第１段階
における圧力以下の圧力下に加圧成形することによっ
て、得られる成形品の本体部分Ｂ，Ｃの密度をフランジ
部分Ａの密度よりも小さくなるように形成する２段階型
締め成形法によって成形することが好ましい。(Ii) Two-step mold clamping method The impact absorbing member having the flange portion of the present invention is not limited to the above-described one-step mold clamping method, and as shown in FIGS. After preheating the fiber-reinforced composite material sheet 3 made of working fibers to a temperature equal to or higher than the melting point or softening point of the thermoplastic resin and placing it between the two molds of the pair of male mold 2 and female mold 1, first, After the portion A corresponding to the flange portion of the molded product is pressure-molded by performing the mold clamping in the first step, then the portion B corresponding to the main body portion of the molded product is subjected to the second stage clamping. Two-stage mold clamping in which the density of the main body parts B and C of the resulting molded product is formed to be smaller than the density of the flange part A by press-molding C under a pressure equal to or lower than the pressure in the first step. Molded by molding method is preferred .
【００１５】このような２段階型締め成形法について説
明すれば、 フランジ部Ａのプレスを行なった後、金型２ａとは
別に設けられた金型２ｂにて本体部分Ｂ，Ｃのプレスを
行なうことにより二段階にてプレスする図２（ａ），
（ｂ），（ｃ）に示す方法、 雄部金型２がフランジ部Ａのプレスを行なう金型部
２ａと、本体部分Ｂ，Ｃのプレスを行なう金型部２ｂと
の二つに分割されていて、該二つに分割された金型２
ａ，２ｂをダブル油圧機構によりそれぞれ独立に作動さ
せて二段階にてプレスする図３（ａ），（ｂ），（ｃ）
に示す方法、 上記の二つに分割された雄金型２の両金型２ａ，
２ｂをスプリング機構４によって加圧力に差を設け、プ
レスを実質的に二段階にて行なう図４（ａ），（ｂ），
（ｃ）に示す方法がある。 これら２段階型締め成形法の中でも及びの方法、特
に方法を採用することが好ましい。Explaining such a two-step mold clamping method, after the flange portion A is pressed, the main body portions B and C are pressed by the mold 2b provided separately from the mold 2a. Pressing in two steps by this, Figure 2 (a),
(B) and (c), the male part mold 2 is divided into two parts, a mold part 2a for pressing the flange part A and a mold part 2b for pressing the main body parts B, C. And the mold 2 divided into two
3a, 2b, and 3c in which a and 2b are independently operated by a double hydraulic mechanism and pressed in two stages.
The method shown in Fig. 2, both molds 2a of the male mold 2 divided into the above two,
2b is provided by the spring mechanism 4 with a difference in pressing force, and the pressing is performed in substantially two steps as shown in FIGS. 4 (a), (b),
There is a method shown in (c). Among these two-step mold clamping methods, it is preferable to adopt the above method, particularly the method.
【００１６】(b) 成形条件等 繊維強化複合材料シートを予熱した後、一対の雌雄金型
の間に載置し、前記成形方法によってフランジ部を有す
る衝撃吸収部材をプレス成形する。予 熱 予熱の温度は熱可塑性樹脂の融点又は軟化点よりも２０
〜６０℃、好ましくは３０〜５０℃程度の高い温度で行
なわれる。成形型上に載置 成形品の外周寸法（Ｌ×Ｗ）にほぼ等しいか、それより
も大きめの、或いは、それよりも小さめの予熱した繊維
強化複合材料シート１枚又は数枚を、或いは、予熱した
繊維強化複合材料シートをロール状に巻き、寸法が成形
品の外周寸法（Ｌ×Ｗ）にほぼ等しいか、それよりも大
きめの、或いは、それよりも小さめとなるようにしたも
の１枚又は複数枚を、或いは、それらを組み合わせたも
のを成形型に載置する。金型温度 金型温度は常用されている温度、すなわち、熱可塑性樹
脂の融点又は軟化点よりも２０℃低い温度又はそれ以下
の温度とする。(B) Molding conditions, etc. After the fiber-reinforced composite material sheet is preheated, it is placed between a pair of male and female molds, and the impact absorbing member having a flange portion is press-molded by the above-mentioned molding method. Temperature of preheating preheating 20 than the melting point or softening point of the thermoplastic resin
It is carried out at a high temperature of about -60 ° C, preferably about 30-50 ° C. Approximately equal to the outer circumferential dimensions of the mounting moldings on the mold (L × W), of larger than, or a fiber-reinforced composite material one sheet or several sheets were smaller preheat than it, or, A sheet of preheated fiber reinforced composite material wound in a roll shape, the dimensions of which are approximately equal to, larger than, or smaller than the outer peripheral dimensions (L × W) of the molded product. Alternatively, a plurality of sheets or a combination thereof are placed on the molding die. Mold temperature The mold temperature is a commonly used temperature, that is, a temperature 20 ° C. lower than the melting point or softening point of the thermoplastic resin or lower.
【００１７】第１段階の型締め 第１段階の型締めにより、成形品のフランジ部に相当す
る部分Ａを、一般に１０〜３００ｋｇｆ／ｃｍ2 、好ま
しくは１５〜２５０ｋｇｆ／ｃｍ2 の圧力を加えてプレ
ス成形する。この第１段階の型締めにより、成形品の外
周寸法（Ｌ×Ｗ）が確保され、同時にフランジ部Ａの密
度が、成形終了後においてほぼその理論密度に近くとな
るようにする。第２段階の型締め 第２段階の型締めにより、成形品のフランジ部以外の部
分（本体部分）に相当する部分Ｂ，Ｃを、一般に０．１
〜３０ｋｇｆ／ｃｍ2 、好ましくは０．５〜１０ｋｇｆ
／ｃｍ2 の圧力を加えてプレス成形する。この第２段階
の型締めにより、Ｂ，Ｃ部の密度が成形終了後において
Ｂ，Ｃ部の密度／Ａ部の密度＝０．５０〜０．９１とな
るようにする。 First-stage mold clamping By the first-stage mold clamping, a pressure of generally 10 to 300 kgf / cm 2 , preferably 15 to 250 kgf / cm 2 is applied to the portion A corresponding to the flange portion of the molded product. Press molding. By the mold clamping in the first stage, the outer peripheral dimension (L × W) of the molded product is secured, and at the same time, the density of the flange portion A is made close to its theoretical density after the molding is completed. Second-stage mold clamping By the second-stage mold clamping, the parts B and C corresponding to the parts (main body parts) other than the flange part of the molded product are generally set to 0.1.
-30 kgf / cm 2 , preferably 0.5-10 kgf
Press molding is performed by applying a pressure of / cm 2 . By the second stage mold clamping, the densities of the B and C parts are set to be the density of the B and C parts / the density of the A part = 0.50 to 0.91 after the molding is completed.
【００１８】[0018]
【実施例】本発明のフランジ部を有する衝撃吸収部材及
びその成形方法をより一層具体的に説明するため、以下
に実施例及び比較例を示すが、本発明はこれら実験例の
方法に限定されるものではない。 実施例１ (1) 繊維強化複合材料シートの製造 水９リットルに界面活性剤を加え、良く攪拌して約２７
リットルに泡立てた水泡中に、ＭＦＲが１３５ｇ／１０
分のポリプロピレンペレットを機械粉砕した平均粒径約
３５０μｍのポリプロピレンパウダー３０４ｇ、及び、
繊維径１０μｍ、長さ１３ｍｍのガラスチョップドスト
ランド１３０ｇを加えて、良く攪拌し、抄紙法により３
１０×３４０×３．５ｍｍｔの大きさの繊維強化複合材
料シート３を作成した。EXAMPLES In order to more specifically describe the impact absorbing member having the flange portion of the present invention and the method for forming the same, the following examples and comparative examples will be shown. However, the present invention is not limited to these experimental examples. Not something. Example 1 (1) Production of Fiber Reinforced Composite Material Sheet A surfactant was added to 9 liters of water and stirred well to about 27
MFR of 135 g / 10 in bubbling to a liter
304g of polypropylene powder having an average particle size of about 350 μm, which is obtained by mechanically crushing polypropylene pellets of 1 minute, and
Add 130 g of glass chopped strands having a fiber diameter of 10 μm and a length of 13 mm, stir well, and use the papermaking method to make 3
A fiber-reinforced composite material sheet 3 having a size of 10 × 340 × 3.5 mmt was prepared.
【００１９】(2) フランジ部を有する衝撃吸収部材の
成形 この繊維強化複合材料シート３を１３５×１８５ｍｍの
大きさに裁断したブランク２枚を、赤外線ヒーターで表
面温度２１０℃、内部温度２００℃となるように予熱
し、これを６０℃の温度に保った下金型（雌型）１上に
載置した（図３（ａ）参照）。第１段階の型締め 次に、６０℃の温度に保った上金型（雄型）２のフラン
ジ部Ａの成形を行なう金型部２ａの凸部と下金型１の凹
部との間で、成形品のフランジ部Ａに相当する複合材料
シート３部分に２０ｋｇｆ／ｃｍ2 の圧力を５秒間かけ
てフランジ部Ａを成形した（図３（ｂ）参照）。第２段階の型締め 次いで、フランジ部Ａを加圧状態に保ったまま、６０℃
の温度に保った上金型２の凸部２ｂと下金型１の凹部と
の間で、成形品の本体部分Ｂ，Ｃに相当する複合材料シ
ート３を１ｋｇｆ／ｃｍ2 の圧力下で６０秒間プレス成
形して（図２（ｃ）参照）、図１に示す寸法のフランジ
部を有する衝撃吸収部材の試験用成形品を得た。評 価 この得られた成形品の寸法、密度等を測定すると共に、
ＪＩＳ−Ｋ７２０８に準拠する圧縮試験を行なった。そ
の結果を表１に示す。(2) Molding of impact absorbing member having flange portion Two blanks obtained by cutting the fiber reinforced composite material sheet 3 into a size of 135 × 185 mm were used with an infrared heater to have a surface temperature of 210 ° C. and an internal temperature of 200 ° C. It was preheated so that it was placed on the lower die (female die) 1 kept at a temperature of 60 ° C. (see FIG. 3A). Clamping of the first stage then between the convex portion and the lower mold 1 of the recess of the mold member 2a that performs molding of 60 ° C. temperature maintained was the upper die of the (male) 2 flange portion A Then, the flange portion A was molded by applying a pressure of 20 kgf / cm 2 to the portion of the composite material sheet 3 corresponding to the flange portion A of the molded product for 5 seconds (see FIG. 3 (b)). Second stage mold clamping, then, with the flange portion A kept under pressure, 60 ° C
Between the convex portion 2b of the upper die 2 and the concave portion of the lower die 1 kept at the temperature of 60 ° C., the composite material sheet 3 corresponding to the main body portions B and C of the molded article is applied under a pressure of 1 kgf / cm 2 Press molding was performed for a second (see FIG. 2C) to obtain a test molded article of the shock absorbing member having the flange portion having the dimensions shown in FIG. Evaluation While measuring the dimensions, density, etc. of the obtained molded product,
A compression test based on JIS-K7208 was performed. The results are shown in Table 1.
【００２０】実施例２ 第２段階の型締めの圧力を５ｋｇｆ／ｃｍ2 とした以外
は実施例１と全く同様の方法で成形を行ない、得られた
成形品の寸法等の測定結果と圧縮試験結果を表１に示
す。Example 2 Molding was carried out in the same manner as in Example 1 except that the pressure of the second stage mold clamping was 5 kgf / cm 2, and the measurement results of the dimensions and the like of the obtained molded product and the compression test. The results are shown in Table 1.
【００２１】実施例３ 第２段階の型締めの圧力を２０ｋｇｆ／ｃｍ2 とした以
外は実施例１と全く同様の方法で成形を行ない、得られ
た成形品の寸法等の測定結果と圧縮試験結果を表１に示
す。Example 3 Molding was carried out in exactly the same manner as in Example 1 except that the pressure of the second stage mold clamping was 20 kgf / cm 2, and the measurement results of the dimensions and the like of the obtained molded product and the compression test. The results are shown in Table 1.
【００２２】実施例４ ポリプロピレンパウダー２６１ｇ、及び、ガラスチップ
ドストランド１１２ｇとして繊維強化複合材料シートを
作成した以外は実施例１と全く同様の方法で成形を行な
い、得られた成形品の寸法等の測定結果と圧縮試験結果
を表１に示す。Example 4 The same procedure as in Example 1 was carried out except that a fiber reinforced composite material sheet was prepared as 261 g of polypropylene powder and 112 g of glass chipped strands. Table 1 shows the measurement results and the compression test results.
【００２３】比較例１ 第２段階の型締めの圧力を０．０５ｋｇｆ／ｃｍ2 とし
た以外は実施例１と全く同様の方法で成形を行ない、得
られた成形品の寸法等の測定結果と圧縮試験を行なった
結果を表１に示す。Comparative Example 1 Molding was carried out in the same manner as in Example 1 except that the pressure of the second-stage mold clamping was set to 0.05 kgf / cm 2, and the measurement results of the dimensions and the like of the obtained molded product were obtained. The results of the compression test are shown in Table 1.
【００２４】比較例２ 第２段階の型締めの圧力を５０ｋｇｆ／ｃｍ2 とした以
外は実施例１と全く同様の方法で成形を行ない、得られ
た成形品の寸法等の測定結果と圧縮試験結果を表１に示
す。Comparative Example 2 Molding was carried out in exactly the same manner as in Example 1 except that the pressure of the second stage mold clamping was set to 50 kgf / cm 2, and the measurement results of the dimensions and the like of the obtained molded product and the compression test. The results are shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【発明の効果】このような本発明のフランジ部を有する
衝撃吸収部材は、圧縮試験における破壊時の変位と荷重
が従来の方法によるプレス成形品より著しく向上し、ま
た、吸収エネルギー値も極めて大きいので、自動車のバ
ンパー、バンパービーム、グローブボックス等の、衝撃
時における高度の衝撃吸収性能が要求される衝撃吸収部
材として有用なものである。As described above, the impact absorbing member having the flange portion of the present invention has a significantly improved displacement and load at the time of breaking in the compression test as compared with the press-formed product by the conventional method, and has an extremely large absorbed energy value. Therefore, it is useful as a shock absorbing member such as a bumper, a bumper beam, a glove box, etc. of an automobile which requires a high level of shock absorbing performance at the time of shock.
【図１】図１は本発明実施例において成形された成形品
の斜視図を表わす。FIG. 1 shows a perspective view of a molded product molded in an embodiment of the present invention.
【図２】図２は本発明の成形方法の一実施例におけるプ
レス成形状態を示す断面図を表わす。FIG. 2 is a sectional view showing a press-molded state in one embodiment of the molding method of the present invention.
【図３】図３は本発明の成形方法の他の実施例における
プレス成形状態を示す断面図を表わす。FIG. 3 is a sectional view showing a press-molded state in another embodiment of the molding method of the present invention.
【図４】図４は本発明の成形方法の更に他の実施例にお
けるプレス成形状態を示す断面図を表わす。FIG. 4 is a sectional view showing a press-molded state in still another embodiment of the molding method of the present invention.
【図５】図５は従来の成形方法におけるプレス成形状態
を示す断面図を表わす。FIG. 5 is a sectional view showing a press-molded state in a conventional molding method.
Ａ 成形品のフランジ部に相当する部分 Ｂ 成形品の本体側壁部 Ｃ 成形品の本体底部 １ 雌金型 ２ 雄金型 ２ａ フランジ部Ａのプレスを行なう金型部 ２ｂ 本体部分Ｂ，Ｃのプレスを行なう金型部 ３ 繊維強化複合材料シート ４ スプリング機構 A part corresponding to the flange part of the molded product B main body side wall part of the molded product C bottom part of the main body of the molded product 1 female mold 2 male mold 2a mold part 2b for pressing the flange part A press of the main body parts B and C Mold part for performing 3 Fiber reinforced composite material sheet 4 Spring mechanism
フロントページの続き (72)発明者 的 場 哲 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内Continuation of front page (72) Inventor Satoshi 5-3 Tokai-cho, Tokai-shi, Aichi Nippon Steel Co., Ltd. Nagoya Steel Works
Claims (5)
化複合材料シートから成形されたフランジ部を有する衝
撃吸収部材であって、該衝撃吸収部材の本体部分の密度
をフランジ部の密度に対して０．５０〜０．９１の比率
としたことを特徴とするフランジ部を有する衝撃吸収部
材。1. A shock absorbing member having a flange portion formed from a fiber-reinforced composite material sheet comprising a thermoplastic resin and reinforcing fibers, wherein the density of the main body portion of the shock absorbing member is relative to the density of the flange portion. And a ratio of 0.50 to 0.91.
塑性樹脂７５〜４５重量％と強化用繊維２５〜５５重量
％からなるものである請求項１に記載のフランジ部を有
する衝撃吸収部材。2. The impact absorption having a flange portion according to claim 1, wherein the ratio of the thermoplastic resin to the reinforcing fiber is 75 to 45% by weight of the thermoplastic resin and 25 to 55% by weight of the reinforcing fiber. Element.
化複合材料シートを熱可塑性樹脂の融点又は軟化点以上
の温度に予熱し、一対の金型の間に載置した後、該金型
の第１段階の型締めによって先ず成形品のフランジ部に
相当する部分を加圧成形し、次いで、第２段階の型締め
によって成形品の本体部分に相当する部分を第１段階に
おける圧力以下にて加圧成形することにより、本体部分
の密度をフランジ部の密度よりも小さくなるように成形
することを特徴とするフランジ部を有する衝撃吸収部材
の成形方法。3. A fiber-reinforced composite material sheet comprising a thermoplastic resin and reinforcing fibers is preheated to a temperature not lower than the melting point or softening point of the thermoplastic resin, placed between a pair of molds, and then the molds. First, the portion corresponding to the flange portion of the molded product is pressure-molded by the first stage mold clamping, and then the portion corresponding to the body portion of the molded product is reduced to the pressure in the first stage or less by the second stage mold clamping. A method for forming an impact absorbing member having a flange portion, characterized in that the main body portion is formed so as to have a density smaller than that of the flange portion by press forming.
５〜４５重量％と強化用繊維２５〜５５重量％からなる
ものである請求項３に記載のフランジ部を有する衝撃吸
収部材の成形方法。4. The thermoplastic resin 7 is used as the fiber-reinforced composite material sheet.
The method for molding an impact absorbing member having a flange portion according to claim 3, which comprises 5 to 45% by weight and 25 to 55% by weight of reinforcing fiber.
と強化用繊維とを用いて湿式分散法によって製造された
ものである請求項３又は４に記載のフランジ部を有する
衝撃吸収部材の成形方法。5. The molding of a shock absorbing member having a flange portion according to claim 3 or 4, wherein the fiber-reinforced composite material sheet is manufactured by a wet dispersion method using a thermoplastic resin and a reinforcing fiber. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5127017A JPH06335934A (en) | 1993-05-28 | 1993-05-28 | Shock-absorbing member with flange part and method for molding the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5127017A JPH06335934A (en) | 1993-05-28 | 1993-05-28 | Shock-absorbing member with flange part and method for molding the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06335934A true JPH06335934A (en) | 1994-12-06 |
Family
ID=14949634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5127017A Pending JPH06335934A (en) | 1993-05-28 | 1993-05-28 | Shock-absorbing member with flange part and method for molding the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06335934A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009196145A (en) * | 2008-02-20 | 2009-09-03 | Toray Ind Inc | Press-molding method and molded body |
| WO2013031860A1 (en) * | 2011-08-31 | 2013-03-07 | 帝人株式会社 | Molded body having rising surface, and method for producing same |
| JP2013542865A (en) * | 2011-07-27 | 2013-11-28 | シャンハイ イ シン インダストリー カンパニー リミテッド | Manufacturing and processing method of flexible plate |
| JP2015187202A (en) * | 2014-03-26 | 2015-10-29 | 王子ホールディングス株式会社 | Fiber-reinforced composite material, method for manufacturing fiber-reinforced composite material, and method for fixing fiber-reinforced composite material |
| US9533437B2 (en) | 2014-06-20 | 2017-01-03 | Teijin Limited | Method for producing shaped product with opening, and shaped product |
| WO2017119465A1 (en) * | 2016-01-08 | 2017-07-13 | 帝人株式会社 | Method for manufacturing fiber-reinforced resin molding |
| JP2018505073A (en) * | 2015-01-21 | 2018-02-22 | トヨタ モーター ヨーロッパ | Mold and method for molding plastic sheet |
| WO2018143283A1 (en) | 2017-02-03 | 2018-08-09 | 帝人株式会社 | Composite material including carbon fibers and thermoplastic resin, molded body production method using same, and molded body |
| JP2019177612A (en) * | 2018-03-30 | 2019-10-17 | 日本ガスケット株式会社 | Method and apparatus for molding fiber reinforced resin |
-
1993
- 1993-05-28 JP JP5127017A patent/JPH06335934A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009196145A (en) * | 2008-02-20 | 2009-09-03 | Toray Ind Inc | Press-molding method and molded body |
| JP2013542865A (en) * | 2011-07-27 | 2013-11-28 | シャンハイ イ シン インダストリー カンパニー リミテッド | Manufacturing and processing method of flexible plate |
| EP2740595A1 (en) * | 2011-07-27 | 2014-06-11 | Shanghai Yi Hsin Industry Co., Ltd. | Method for making and processing flexible plate material |
| EP2740595A4 (en) * | 2011-07-27 | 2015-03-25 | Shanghai Yi Hsin Industry Co Ltd | Method for making and processing flexible plate material |
| US10322559B2 (en) | 2011-08-31 | 2019-06-18 | Teijin Limited | Shaped product having standing plane, and method for manufacturing the same |
| WO2013031860A1 (en) * | 2011-08-31 | 2013-03-07 | 帝人株式会社 | Molded body having rising surface, and method for producing same |
| JP2015187202A (en) * | 2014-03-26 | 2015-10-29 | 王子ホールディングス株式会社 | Fiber-reinforced composite material, method for manufacturing fiber-reinforced composite material, and method for fixing fiber-reinforced composite material |
| US9533437B2 (en) | 2014-06-20 | 2017-01-03 | Teijin Limited | Method for producing shaped product with opening, and shaped product |
| JP2018505073A (en) * | 2015-01-21 | 2018-02-22 | トヨタ モーター ヨーロッパ | Mold and method for molding plastic sheet |
| JPWO2017119465A1 (en) * | 2016-01-08 | 2018-10-25 | 帝人株式会社 | Method for producing fiber-reinforced resin molded body |
| WO2017119465A1 (en) * | 2016-01-08 | 2017-07-13 | 帝人株式会社 | Method for manufacturing fiber-reinforced resin molding |
| US10889076B2 (en) | 2016-01-08 | 2021-01-12 | Teijin Limited | Method for producing fiber-reinforced resin shaped product |
| WO2018143283A1 (en) | 2017-02-03 | 2018-08-09 | 帝人株式会社 | Composite material including carbon fibers and thermoplastic resin, molded body production method using same, and molded body |
| US11384209B2 (en) | 2017-02-03 | 2022-07-12 | Teijin Limited | Composite material including carbon fibers and thermoplastic resin, molded body production method using same, and molded body |
| JP2019177612A (en) * | 2018-03-30 | 2019-10-17 | 日本ガスケット株式会社 | Method and apparatus for molding fiber reinforced resin |
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