JP4718935B2 - Resin molded body and automobile door provided with the same - Google Patents

Resin molded body and automobile door provided with the same Download PDF

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JP4718935B2
JP4718935B2 JP2005245738A JP2005245738A JP4718935B2 JP 4718935 B2 JP4718935 B2 JP 4718935B2 JP 2005245738 A JP2005245738 A JP 2005245738A JP 2005245738 A JP2005245738 A JP 2005245738A JP 4718935 B2 JP4718935 B2 JP 4718935B2
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door
molded body
resin
carrier plate
cavity
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JP2007055173A (en
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真司 賀佐見
敏記 宮地
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Daikyo Nishikawa Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/586—Moulds with a cavity increasing in size during foaming

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  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)

Description

本発明は、筒状突出部を備え、内部に多数の空隙が形成された樹脂成形体及びそれを備えた自動車のドアに関するものである。   The present invention relates to a resin molded body having a cylindrical protrusion and having a large number of voids formed therein, and an automobile door including the resin molded body.

従来より、ドアアウタパネルとドアインナパネルとを備えたドア本体のドアインナパネルに取り付けられたキャリアプレートのパネル部材に、車両の側面衝突時の衝撃エネルギーを吸収する衝撃吸収部（突出部）が一体に形成された自動車ドアが知られている（例えば、特許文献１参照）。この衝撃吸収部は、衝撃吸収部の車内側壁部を構成する突出方向に略垂直な縦壁部と、縦壁部から突出方向に延びる縦リブ及び横リブが組み合わされた格子状リブとにより構成されている。   Conventionally, a carrier plate panel member attached to a door inner panel of a door body having a door outer panel and a door inner panel is integrated with an impact absorbing portion (protruding portion) for absorbing impact energy at the time of a vehicle side collision. There is known an automobile door formed in (see, for example, Patent Document 1). This shock absorbing portion is composed of a vertical wall portion that is substantially perpendicular to the protruding direction that constitutes the vehicle interior side wall portion of the shock absorbing portion, and a grid-like rib that is a combination of vertical ribs and horizontal ribs that extend from the vertical wall portion in the protruding direction. Has been.

一方、スライド型を内蔵した雄型と雌型と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、キャビティ内で該熱可塑性樹脂が固化する過程で、スライド型をキャビティ容積が型開き方向に拡大するように後退移動させ、成形型で圧縮されている繊維の弾性復元力（スプリングバック現象）により、繊維入り熱可塑性樹脂を膨張させることで、樹脂密度の高いスキン層が表面全体に形成されるとともに、多数の空隙を有し、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樹脂成形体を得るものが知られている（例えば、特許文献２参照）。   On the other hand, with the male mold and female mold containing the slide mold closed, the thermoplastic resin containing fibers is injected and filled into the cavity, and the slide mold is formed into the cavity in the process of solidifying the thermoplastic resin in the cavity. A skin layer with a high resin density is obtained by reversing the volume so that the volume expands in the mold opening direction and expanding the thermoplastic resin with fibers by the elastic restoring force (spring back phenomenon) of the fibers compressed in the mold. Is formed over the entire surface, and has a large number of voids, and a resin molded body in which an expanded layer having a lower resin density than the skin layer is formed is known (for example, Patent Document 2). reference).

そして、上記特許文献１のようなキャリアプレートの衝撃吸収部に特許文献２のような膨張層を形成することにより、衝撃エネルギーの吸収効果が高められることが知られている。
特開２００１−２３９８３４号公報 特開２０００−２５０５７号公報 And it is known that the impact energy absorption effect is enhanced by forming an expansion layer as in Patent Document 2 in the impact absorbing portion of the carrier plate as in Patent Document 1 described above.
Japanese Patent Laid-Open No. 2001-239834 Japanese Patent Laid-Open No. 2000-25057

しかし、一般に、上述したような膨張層が形成された衝撃吸収部を備えたキャリアプレートを成形する場合、成形型の型開き方向は衝撃吸収部の突出方向に沿っている。この場合、衝撃吸収部の突出方向に略垂直な縦壁部には、膨張層が形成される。しかし、スライド型を後退させても、衝撃吸収部の格子状リブに対応するキャビティ容積は実質的に拡大せず、衝撃吸収部の格子状リブに膨張層はほとんど形成されない。このため、膨張層が潰れることで衝撃を吸収する部分が縦壁部のみであり、衝撃エネルギーを十分に、効率よく吸収できないという問題があった。   However, in general, when a carrier plate having an impact absorbing portion in which an expansion layer as described above is formed is molded, the mold opening direction of the mold is along the protruding direction of the impact absorbing portion. In this case, an expansion layer is formed on the vertical wall portion that is substantially perpendicular to the protruding direction of the shock absorbing portion. However, even if the slide mold is retracted, the cavity volume corresponding to the lattice-like ribs of the shock absorbing portion is not substantially enlarged, and the expansion layer is hardly formed on the lattice-like ribs of the shock absorbing portion. For this reason, only the vertical wall portion absorbs the impact when the expansion layer is crushed, and there is a problem that the impact energy cannot be absorbed sufficiently and efficiently.

本発明は、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、樹脂成形体の突出部を衝撃エネルギーを効率よく吸収できるようにすることにある。   This invention is made | formed in view of this point, The place made into the objective is to make it possible to absorb the impact energy efficiently in the protrusion part of a resin molding.

上記の目的を達成するために、本発明では、突出部に、突出方向に間隔をあけながら連続して回周し、膨張層が形成された螺旋状段部を一体に形成するようにした。   In order to achieve the above object, in the present invention, a spiral step portion having an inflated layer formed integrally is formed around the protrusion portion with a gap in the protrusion direction.

具体的には、第１の発明では、パネル状の成形体本体の一側面に衝撃吸収用の筒状突出部が一体に突設された樹脂成形体であって、上記突出部は、基端部が上記成形体本体に一体に形成され、かつ基端部側が開口された筒状の周壁と、当該突出部の突出方向と交差して上記周壁の突出方向先端に一体に連結されて当該先端を塞ぐ頂壁とを備え、上記突出部の上記周壁には、突出部の突出方向と交差するとともに該突出方向に間隔をあけながら連続して回周する螺旋状段部が一体に形成され、上記段部及び頂壁には、成形型のキャビティ内に射出した熱可塑性樹脂が固化する過程で表面に形成される樹脂密度の大きいスキン層と、上記段部に対応するキャビティ容積を拡大させて上記熱可塑性樹脂を膨張させることにより内部に多数の空隙を有し上記スキン層で包囲される膨張層とが一体に形成され、上記突出部の段部及び頂壁を除く立ち上がり部は、成形時に該立ち上がり部に対応するキャビティ容積を実質的に拡大せず、内部に空隙を有しないソリッドである構成とする。 Specifically, according to the first aspect of the present invention, there is provided a resin molded body in which a cylindrical projecting portion for absorbing an impact is integrally projected on one side surface of a panel-shaped molded body, and the projecting portion has a base end. A cylindrical peripheral wall whose part is integrally formed with the molded body body and whose base end side is open, and the distal end that is integrally connected to the distal end of the peripheral wall in the projecting direction and intersects the projecting direction of the projecting part and a top wall which closes the, in the peripheral wall of the projecting portion, a spiral stepped portion for rotating circumferential continuously while an interval in the left direction projecting with crossing the projecting direction of the collision detecting portion are integrally formed The stepped portion and the top wall have a skin layer with a high resin density formed on the surface during the process of solidifying the thermoplastic resin injected into the mold cavity, and the cavity volume corresponding to the stepped portion is enlarged. By expanding the above-mentioned thermoplastic resin, there are many voids inside. An expansion layer, which is surrounded by the skin layer are integrally formed, the rising portion excluding the stepped portion and the top wall of the protruding portion does not substantially expand the cavity volume corresponding to the rising portion at the time of molding, the internal It is set as the structure which is a solid which does not have a space | gap.

第２の発明では、上記段部は、上記突出部の全周に亘って設けられる構成とする。   In 2nd invention, the said step part is set as the structure provided over the perimeter of the said protrusion part.

第３の発明では、ドアアウタパネルとドアインナパネルとを備えたドア本体の該ドアインナパネルにキャリアプレートが取り付けられ、該キャリアプレートをドアトリムが車内側から被うように上記ドアインナパネルに取り付けられた自動車のドアであって、上記キャリアプレートは、上記樹脂成形体で成形され、上記突出部の先端が車内側及び車外側の少なくともいずれか一方に位置づけられる構成とする。   In the third aspect of the invention, a carrier plate is attached to the door inner panel of the door body provided with a door outer panel and a door inner panel, and the carrier plate is attached to the door inner panel so that the door trim covers from the inside of the vehicle. The carrier plate is formed of the resin molded body, and the tip of the protrusion is positioned on at least one of the vehicle inner side and the vehicle outer side.

上記第１の発明によれば、多数の空隙を有して樹脂密度の低い膨張層を備えた突出部の段部を突出方向に間隔をあけながら連続して回周する螺旋状に形成している。このため、螺旋状に形成された段部全体で衝撃エネルギーを吸収することができるので、突出部の衝撃エネルギー吸収量を多くすることができる。さらに、衝撃エネルギーを突出部で吸収する際に、螺旋状の段部で連続して吸収するので、スムーズなエネルギー吸収が行われる。よって、衝撃エネルギーを効率よく吸収することができる。   According to the first aspect of the present invention, the stepped portion of the protruding portion having a large number of voids and having an expanded layer having a low resin density is formed in a spiral shape that continuously circulates while being spaced in the protruding direction. Yes. For this reason, since the impact energy can be absorbed by the entire step portion formed in a spiral shape, the amount of impact energy absorbed by the protruding portion can be increased. Furthermore, since the impact energy is absorbed by the protruding portion, it is continuously absorbed by the spiral step portion, so that smooth energy absorption is performed. Therefore, impact energy can be absorbed efficiently.

上記第２の発明によれば、段部を突出部の全周に亘って設けて、段部の面積をさらに大きくすることで、突出部の衝撃エネルギー吸収量をより多くし、衝撃エネルギーの吸収効率をより一層高めることができる。   According to the second aspect of the present invention, the step portion is provided over the entire circumference of the protruding portion, and the area of the step portion is further increased, so that the impact energy absorption amount of the protruding portion is increased, and the impact energy is absorbed. Efficiency can be further increased.

上記第３の発明によれば、衝撃エネルギーを効率よく吸収することができる軽量な自動車ドアを簡単に得ることができる。   According to the third aspect, a lightweight automobile door that can efficiently absorb impact energy can be easily obtained.

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。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図４は、自動車のサイドドア１を示す断面図である。このサイドドア１は、ドアアウタパネル３と、このドアアウタパネル３の外周に周縁が固着されて内方に開口部５ａを有するドアインナパネル５とを備えたドア本体７を有し、上記ドアインナパネル５に、本発明の実施形態に係る樹脂成形体としての樹脂製のキャリアプレート９が、上記開口部５ａを覆うようにシール材１１を介して取り付けられている。そして、キャリアプレート９を車内側から被うように、ドアトリム１３がドアインナパネル５に取り付けられている。このキャリアプレート９は、繊維入り熱可塑性樹脂で成形されている。ドアアウタパネル３の車内側には、発泡ウレタン等の緩衝材からなるパッド１５が、乗員の腰部に対応する位置に設けられている。   FIG. 4 is a cross-sectional view showing the side door 1 of the automobile. The side door 1 includes a door main body 7 including a door outer panel 3 and a door inner panel 5 having a periphery fixed to the outer periphery of the door outer panel 3 and having an opening 5a on the inside. 5, a resin carrier plate 9 as a resin molded body according to an embodiment of the present invention is attached via a sealing material 11 so as to cover the opening 5a. And the door trim 13 is attached to the door inner panel 5 so that the carrier plate 9 may be covered from the vehicle inner side. The carrier plate 9 is formed of a fiber-containing thermoplastic resin. A pad 15 made of cushioning material such as urethane foam is provided on the vehicle inner side of the door outer panel 3 at a position corresponding to the occupant's waist.

上記キャリアプレート９は、パネル状の成形体本体としてのプレート本体１７を備えている。このプレート本体１７の上記パッド１５に対応する位置には、筒状突出部としての螺旋状の衝撃吸収部１９が、ドアアウタパネル３側に向かって突設されている。衝撃吸収部１９のドアトリム１３側の基端部２０はプレート本体１７に一体に形成されている。   The carrier plate 9 includes a plate body 17 as a panel-shaped molded body. At a position corresponding to the pad 15 of the plate main body 17, a spiral impact absorbing portion 19 as a cylindrical protruding portion is provided so as to protrude toward the door outer panel 3 side. A base end portion 20 on the door trim 13 side of the shock absorbing portion 19 is formed integrally with the plate body 17.

図１〜図３に示すように、衝撃吸収部１９は、基端部２０側が開口された筒状の周壁１９ａと、当該衝撃吸収部１９の突出方向と交差して上記周壁１９ａの突出方向先端に一体に連結されて当該先端を塞ぐ頂壁１９ｂとを備えている。衝撃吸収部１９の周壁１９ａには、平面視矩形状に螺旋する段部１９ｃが、衝撃吸収部１９の突出方向と直交（交差）するとともに突出方向に間隔をあけながら連続して回周するように、全周に亘って一体に形成されている。そして、周壁１９ａの段部１９ｃを除く、頂壁１９ｂに対して垂直に立ち上がった部位を立ち上がり部１９ｄとしている。 As shown in FIGS. 1 to 3, the shock absorbing portion 19 includes a cylindrical peripheral wall 19 a that is open on the base end portion 20 side, and a protruding end of the peripheral wall 19 a that intersects the protruding direction of the shock absorbing portion 19. And a top wall 19b that is integrally connected to the front end and closes the tip . On the peripheral wall 19a of the shock absorbing part 19, a step part 19c spiraling in a rectangular shape in plan view is perpendicular to (intersects) the protruding direction of the shock absorbing part 19 and continuously circulates with a gap in the protruding direction. Moreover, it is integrally formed over the entire circumference. And the site | part which stood | emitted perpendicularly | vertically with respect to the top wall 19b except the step part 19c of the surrounding wall 19a is made into the standing part 19d.

衝撃吸収部１９の頂壁１９ｂ及び段部１９ｃには、表面層を構成する樹脂密度の高いスキン層２１と、このスキン層２１で包囲され、かつ多数の空隙を有しスキン層２１に比べて樹脂密度の低い膨張層２２とが一体に形成されている。これに対し、衝撃吸収部１９の立ち上がり部１９ｄは、空隙（膨張層）のないソリッドとなっている。なお、上記衝撃吸収部１９を除くプレート本体１７は、膨張層２２のないソリッド層のみで形成されている。図３中、Ｆは繊維を示す。   The top wall 19b and the stepped portion 19c of the shock absorbing portion 19 have a skin layer 21 having a high resin density constituting the surface layer, and are surrounded by the skin layer 21 and have a large number of voids compared to the skin layer 21. The expansion layer 22 having a low resin density is integrally formed. On the other hand, the rising portion 19d of the shock absorbing portion 19 is a solid without a void (expanded layer). The plate body 17 excluding the impact absorbing portion 19 is formed only of a solid layer without the expansion layer 22. In FIG. 3, F indicates a fiber.

次に、上記の衝撃吸収部１９を有するキャリアプレート９の製造方法を詳細に説明する。   Next, a method for manufacturing the carrier plate 9 having the impact absorbing portion 19 will be described in detail.

図５に示すように、凸部２３を有する固定型２５と、この固定型２５に対して進退可能に対向配置された可動型２８とを備えた成形型３１を用意する。上記可動型２８には、上記凸部２３が挿入可能な凹部２７を有するスライド型２９が、進退可能に挿入配置されている。上記固定型２５の凸部２３の外周面には、衝撃吸収部１９の周壁１９ａ（段部１９ｃ、立ち上がり部１９ｄ）の内面形状に対応した螺旋状段部２３ａ及び立ち上がり部２３ｂが形成されている。そして、上記スライド型２９の凹部２７の内周面には、衝撃吸収部１９の周壁１９ａの外面形状に対応した螺旋状段部２７ａ及び立ち上がり部２７ｂが形成されている。   As shown in FIG. 5, a forming die 31 including a fixed die 25 having a convex portion 23 and a movable die 28 disposed so as to face the fixed die 25 so as to advance and retreat is prepared. In the movable mold 28, a slide mold 29 having a concave portion 27 into which the convex portion 23 can be inserted is inserted and disposed so as to be able to advance and retreat. On the outer peripheral surface of the convex portion 23 of the fixed mold 25, a spiral step portion 23a and a rising portion 23b corresponding to the inner surface shape of the peripheral wall 19a (step portion 19c, rising portion 19d) of the shock absorbing portion 19 are formed. . A spiral step portion 27 a and a rising portion 27 b corresponding to the outer surface shape of the peripheral wall 19 a of the shock absorbing portion 19 are formed on the inner peripheral surface of the concave portion 27 of the slide mold 29.

そして、上記スライド型２９を進出させた状態で成形型３１を型閉じする。次に、キャビティ３３内に射出機（図示せず）から、例えば、ガラス繊維入りポリプロピレン樹脂等の繊維入り熱可塑性樹脂Ｒ（以下、単に樹脂Ｒという）を射出充填する。その後、成形型３１のキャビティ３３内で上記樹脂Ｒが固化する過程で、すなわち、キャビティ３３における成形型３１の成形面近傍の樹脂Ｒに、型温の影響により早期に冷却されてスキン層２１が形成され、かつ、内部が粘度の高いゲル状態にある時点で、スライド型２９をキャビティ容積が拡大する方向Ａに、図５に二点鎖線で示す位置まで後退移動させる。つまり、スライド型２９を固定型２５からわずかに離れさせ、衝撃吸収部１９の頂壁１９ｂ及び段部１９ｃに対応するキャビティ容積を、例えば２倍、もしくはそれ以上に拡大させる。このように、上記キャビティ容積を拡大すると、それまで成形型３１で圧縮されていたゲル状態の樹脂Ｒ中の繊維Ｆが、上記圧縮から解放されて弾性的に復元し、図６に示すように、この弾性復元力（スプリングバック現象）で、上記樹脂Ｒが膨張する。   Then, the mold 31 is closed with the slide mold 29 advanced. Next, for example, a fiber-containing thermoplastic resin R (hereinafter simply referred to as a resin R) such as a glass fiber-containing polypropylene resin is injected and filled into the cavity 33 from an injection machine (not shown). Thereafter, in the process of solidifying the resin R in the cavity 33 of the mold 31, that is, the resin R in the vicinity of the molding surface of the mold 31 in the cavity 33 is cooled early due to the influence of the mold temperature, and the skin layer 21 is formed. When the gel is formed and the gel is in a highly viscous state, the slide mold 29 is moved backward in the direction A in which the cavity volume is expanded to the position indicated by the two-dot chain line in FIG. In other words, the slide mold 29 is slightly separated from the fixed mold 25, and the cavity volume corresponding to the top wall 19b and the stepped portion 19c of the shock absorbing portion 19 is increased, for example, twice or more. Thus, when the cavity volume is increased, the fibers F in the resin R in the gel state that has been compressed by the molding die 31 are released from the compression and elastically restored, as shown in FIG. The resin R expands by this elastic restoring force (spring back phenomenon).

図５に示すように、樹脂Ｒの射出充填前の衝撃吸収部１９の頂壁１９ｂに対応するキャビティ間隔をＷ１、段部１９ｃに対応するキャビティ間隔をＷ２、立ち上がり部１９ｄに対応するキャビティ間隔をＷ３とする。また、図３に示すように、衝撃吸収部１９の頂壁１９ｂの縦方向の厚みをＴ１、段部１９ｃの縦方向の厚みをＴ２、立ち上がり部１９ｄの横方向の厚みをＴ３とする。すると、これらの関係は、Ｔ１≧２Ｗ１、Ｔ２≧２Ｗ２、Ｔ１＝Ｔ２、Ｗ１＝Ｗ２となっている。   As shown in FIG. 5, the cavity interval corresponding to the top wall 19b of the shock absorber 19 before injection filling of the resin R is W1, the cavity interval corresponding to the stepped portion 19c is W2, and the cavity interval corresponding to the rising portion 19d is Let W3. Further, as shown in FIG. 3, the vertical thickness of the top wall 19b of the shock absorber 19 is T1, the vertical thickness of the step portion 19c is T2, and the horizontal thickness of the rising portion 19d is T3. Then, these relationships are T1 ≧ 2W1, T2 ≧ 2W2, T1 = T2, and W1 = W2.

これに対し、立ち上がり部１９ｄは、スライド型２９の後退移動方向に略沿っているため、成形時に立ち上がり部１９ｄの厚み方向に対応するキャビティ容積は実質的に拡大せず、Ｔ３≒Ｗ３の関係になっている。すなわち、成形型３１には抜き勾配があり、若干傾斜しているため、立ち上がり部１９ｄの厚み方向に対応するキャビティ容積は多少拡大する。しかし、この程度の拡大では、樹脂Ｒ中の繊維Ｆは、弾性復元力が抑制された状態で固化する。このため、成形後の立ち上がり部１９ｄは、膨張層が生成されず空隙のないソリッドになっている。   On the other hand, since the rising portion 19d is substantially along the backward movement direction of the slide mold 29, the cavity volume corresponding to the thickness direction of the rising portion 19d is not substantially enlarged during molding, and the relationship of T3≈W3 is satisfied. It has become. That is, since the mold 31 has a draft and is slightly inclined, the cavity volume corresponding to the thickness direction of the rising portion 19d is somewhat enlarged. However, with this degree of expansion, the fibers F in the resin R solidify in a state where the elastic restoring force is suppressed. For this reason, the rising portion 19d after the molding is a solid without an expanded layer being generated.

なお、プレート本体１７の衝撃吸収部１９を除く部分は、可動型２８がスライド型２９の後退時に図５のＡ方向に後退せず、当該部分のキャビティ容積が拡大しないので、樹脂密度の高いソリッドになっている。   Note that the portion of the plate body 17 excluding the impact absorbing portion 19 does not move back in the direction A in FIG. It has become.

図７に、衝撃吸収部１９に荷重が作用したときの時間と衝撃吸収部１９の衝撃エネルギーの吸収量との関係を示す。本実施形態にかかる衝撃吸収部１９の段部１９ｃは、螺旋状に連続して回周するように形成されているため、衝撃荷重が作用すると段部１９ｃが連続して潰れていき、段部１９ｃの膨張層２２で衝撃エネルギーが連続して吸収される。このため、スムーズに衝撃エネルギーの吸収が行われる。   FIG. 7 shows the relationship between the time when a load is applied to the shock absorbing portion 19 and the amount of shock energy absorbed by the shock absorbing portion 19. Since the step portion 19c of the impact absorbing portion 19 according to the present embodiment is formed so as to continuously circulate in a spiral shape, the step portion 19c is continuously crushed when an impact load is applied. The impact energy is continuously absorbed by the expansion layer 22 of 19c. For this reason, impact energy is smoothly absorbed.

したがって、本実施形態のキャリアプレート９においては、多数の空隙を有して樹脂密度の低い膨張層２２を備えた段部１９ｃを、突出方向に間隔をあけながら連続して回周する螺旋状に形成している。このため、螺旋状に形成された段部１９ｃ全体で衝撃エネルギーを吸収することができるので、衝撃吸収部１９の衝撃エネルギー吸収量を多くすることができる。   Therefore, in the carrier plate 9 of the present embodiment, the stepped portion 19c having the expanded layer 22 having a large number of voids and a low resin density is spirally wound around the protruding direction at intervals. Forming. For this reason, since the impact energy can be absorbed by the entire step portion 19c formed in a spiral shape, the impact energy absorption amount of the impact absorbing portion 19 can be increased.

さらに、衝撃エネルギーを衝撃吸収部１９で吸収する際に、衝撃エネルギーを螺旋状の段部１９ｃで連続して吸収するので、スムーズなエネルギー吸収が行われる。よって、衝撃エネルギーを効率よく吸収することができる。   Furthermore, when the impact energy is absorbed by the impact absorbing portion 19, the impact energy is continuously absorbed by the spiral step portion 19c, so that smooth energy absorption is performed. Therefore, impact energy can be absorbed efficiently.

また、上記キャリアプレート９を備えることにより、衝撃エネルギーを効率よく吸収することができる軽量なサイドドア１を簡単に得ることができる。   In addition, by providing the carrier plate 9, a lightweight side door 1 that can efficiently absorb impact energy can be easily obtained.

《その他の実施形態》
本発明は、上記実施形態について、以下のような構成としてもよい。 << Other Embodiments >>
The present invention may be configured as follows with respect to the above embodiment.

すなわち、上記実施形態では、樹脂Ｒ中の繊維のスプリングバック現象を利用してキャリアプレート９の内部に空隙を形成したが、樹脂Ｒ中に発泡剤を含有させてもよい。そうすれば、スライド型２９の後退移動量を大きくして、衝撃吸収部１９の頂壁１９ｂ及び段部１９ｃに対応する成形型３１のキャビティ容積を大きくした場合、スプリングバック現象における繊維の復元力が不足しても、発泡剤の発泡力が繊維の復元力を補完するので、空隙を有する膨張層２２を確実に形成することができる。また、繊維を混入せずに発泡剤のみを混入した熱可塑性樹脂を用いて膨張層を形成することも用途目的によっては可能である。これらの場合、発泡剤としては、化学反応によりガスを発生させる化学的発泡剤や、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剤等がある。   That is, in the above embodiment, the void is formed inside the carrier plate 9 using the springback phenomenon of the fibers in the resin R. However, the resin R may contain a foaming agent. Then, when the amount of backward movement of the slide die 29 is increased and the cavity volume of the mold 31 corresponding to the top wall 19b and the step portion 19c of the shock absorbing portion 19 is increased, the restoring force of the fiber in the springback phenomenon. Even if the amount is insufficient, the foaming force of the foaming agent complements the restoring force of the fiber, so that the expansion layer 22 having voids can be reliably formed. Further, depending on the purpose of use, it is also possible to form an expanded layer using a thermoplastic resin in which only a foaming agent is mixed without mixing fibers. In these cases, examples of the foaming agent include a chemical foaming agent that generates gas by a chemical reaction, and a physical foaming agent that uses an inert gas such as carbon dioxide gas and nitrogen gas.

また、上記実施形態では、樹脂成形体が自動車のサイドドア１のドアインナパネル５に取り付けられたキャリアプレート９である場合を示したが、バックドアのドアインナパネル、自動車のインストルメントパネルに設けられるニーパッド等であってもよく、さらには、自動車以外のパネルに適用することができる。   Moreover, in the said embodiment, although the case where the resin molding was the carrier plate 9 attached to the door inner panel 5 of the side door 1 of a motor vehicle was shown, it provided in the door inner panel of a back door, and the instrument panel of a motor vehicle. It can be applied to a panel other than an automobile.

また、上記実施形態では、キャリアプレート９には、一つの衝撃吸収部１９を形成したが、径の小さな衝撃吸収部を複数形成することとしてもよい。また、衝撃吸収部の先端が車内側に位置づけられるように形成してもよく、複数の衝撃吸収部の先端が車内側及び車外側の両側に位置づけられるように形成してもよい。   In the above embodiment, one shock absorbing portion 19 is formed on the carrier plate 9, but a plurality of shock absorbing portions having a small diameter may be formed. Further, the tip of the impact absorbing portion may be formed so as to be positioned on the inside of the vehicle, or the tip of the plurality of shock absorbing portions may be formed on both sides of the inside of the vehicle and the outside of the vehicle.

また、上記実施形態では、ドアアウタパネル３の車内側にパッド１５を設けたが、ドアトリム１３の車外側に一体に形成してもよい。   Moreover, in the said embodiment, although the pad 15 was provided in the vehicle inner side of the door outer panel 3, you may form in the vehicle outer side of the door trim 13 integrally.

また、上記実施形態では、衝撃吸収部１９を除くプレート本体１７の部分は、膨張層２２のないソリッドで形成されているが、この部分にスキン層及び膨張層を有するように形成してもよい。   Moreover, in the said embodiment, although the part of the plate main body 17 except the impact-absorbing part 19 is formed with the solid without the expansion layer 22, you may form so that it may have a skin layer and an expansion layer in this part. .

また、上記実施形態では、衝撃吸収部１９は、矩形状に螺旋する突出部としたが、平面視で円形状に螺旋する突出部としてもよい。   Moreover, in the said embodiment, although the impact-absorbing part 19 was made into the protrusion part spiraled in a rectangular shape, it is good also as a protrusion part spiraled in a circular shape by planar view.

また、上記実施形態では、段部１９ｃを周壁１９ａの全周に亘って連続して設けることとしたが、断続的に設けてもよい。ただし、段部１９ｃを周壁１９ａの全周に亘って設けると、段部１９ｃの面積がさらに大きくなって、衝撃吸収部１９の衝撃エネルギー吸収量がより多くなり、衝撃エネルギーの吸収効率をより高めることができるので、周壁１９ａの全周に亘って連続して段部１９ｃを設けることが望ましい。   Moreover, in the said embodiment, although the step part 19c was continuously provided over the perimeter of the surrounding wall 19a, you may provide intermittently. However, if the stepped portion 19c is provided over the entire circumference of the peripheral wall 19a, the area of the stepped portion 19c is further increased, the impact energy absorption amount of the shock absorbing portion 19 is increased, and the impact energy absorption efficiency is further increased. Therefore, it is desirable to provide the step portion 19c continuously over the entire circumference of the peripheral wall 19a.

以上説明したように、本発明は、突出部を備え内部に多数の空隙が形成された樹脂成形体について有用である。   As described above, the present invention is useful for a resin molded body having a protrusion and having a large number of voids formed therein.

本発明の実施形態に係るキャリアプレートの衝撃吸収部をドアアウタパネル側から見た平面図である。It is the top view which looked at the shock absorption part of the carrier plate which concerns on embodiment of this invention from the door outer panel side. 図１における衝撃吸収部の側面図である。It is a side view of the impact-absorbing part in FIG. 図１のIII−III線断面図である。It is the III-III sectional view taken on the line of FIG. 本発明の実施形態に係るキャリアプレートが適用された自動車のドアの断面図である。It is sectional drawing of the door of the motor vehicle to which the carrier plate which concerns on embodiment of this invention was applied. 成形型の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を示す断面図である。It is sectional drawing which shows the state which injected and filled the thermoplastic resin containing a fiber in the cavity of a shaping | molding die. 成形型のスライド型をキャビティ容積が拡大する方向に後退移動させてキャリアプレートが成形された状態を示す断面図である。It is sectional drawing which shows the state by which the carrier plate was shape | molded by retreating the slide type | mold of a shaping | molding die to the direction which enlarges a cavity volume. 衝撃吸収部に荷重が作用したときの時間と衝撃吸収部の衝撃エネルギー吸収量との関係を示すグラフである。It is a graph which shows the relationship between the time when a load acts on an impact-absorbing part, and the impact energy absorption amount of an impact-absorbing part.

１ サイドドア（自動車のドア）
３ ドアアウタパネル
５ ドアインナパネル
７ ドア本体
９ キャリアプレート（樹脂成形体）
１３ ドアトリム
１７ プレート本体（成形体本体）
１９ 衝撃吸収部（突出部）
１９ａ 周壁
１９ｂ 頂壁
１９ｃ 段部
１９ｄ 立ち上がり部
２０ 基端部
２１ スキン層
２２ 膨張層
３１ 成形型
３３ キャビティ
Ｒ 繊維入り熱可塑性樹脂
1 Side door (car door)
3 Door Outer Panel 5 Door Inner Panel 7 Door Body 9 Carrier Plate (Resin Molded Body)
13 Door trim 17 Plate body (molded body)
19 Shock absorber (protrusion)
19a wall
19b Top wall 19c Stepped part 19d Rising part
20 Base end 21 Skin layer 22 Expansion layer 31 Mold 33 Cavity R Fiber-containing thermoplastic resin

Claims (3)

パネル状の成形体本体（１７）の一側面に衝撃吸収用の筒状突出部（１９）が一体に突設された樹脂成形体であって、
上記突出部（１９）は、基端部（２０）が上記成形体本体に一体に形成され、かつ基端部（２０）側が開口された筒状の周壁（１９ａ）と、当該突出部（１９）の突出方向と交差して上記周壁（１９ａ）の突出方向先端に一体に連結されて当該先端を塞ぐ頂壁（１９ｂ）とを備え、
上記突出部の上記周壁（１９ａ）には、突出部（１９）の突出方向と交差するとともに該突出方向に間隔をあけながら連続して回周する螺旋状段部（１９ｃ）が一体に形成され、
上記段部（１９ｃ）及び頂壁（１９ｂ）には、成形型（３１）のキャビティ（３３）内に射出した熱可塑性樹脂（Ｒ）が固化する過程で表面に形成される樹脂密度の大きいスキン層（２１）と、上記段部（１９ｃ）に対応するキャビティ（３３）容積を拡大させて上記熱可塑性樹脂（Ｒ）を膨張させることにより内部に多数の空隙を有し上記スキン層（２１）で包囲される膨張層（２２）とが一体に形成され、
上記突出部（１９）の段部（１９ｃ）及び頂壁（１９ｂ）を除く立ち上がり部（１９ｄ）は、成形時に該立ち上がり部（１９ｄ）に対応するキャビティ（３３）容積を実質的に拡大せず、内部に空隙を有しないソリッドであることを特徴とする樹脂成形体。 A resin molded body in which a cylindrical projection (19) for impact absorption is integrally projected on one side of a panel-shaped molded body (17) ,
The protrusion (19) includes a cylindrical peripheral wall (19a) having a base end (20) formed integrally with the molded body and an opening on the base end (20) side, and the protrusion (19). And a top wall (19b) that is integrally connected to the distal end in the projecting direction of the peripheral wall (19a) and closes the distal end.
The aforementioned peripheral wall of the projecting portion (19a), formed in a spiral stepped portion of the circumferential times in succession while spaced out intervals in a direction projecting (19c) is integrally together intersects the protruding direction of the collision detection section (19) And
Skin having a high resin density formed on the surface of the step (19c) and the top wall (19b) formed in the process of solidifying the thermoplastic resin (R) injected into the cavity (33) of the mold (31). The layer (21) and the cavity (33) corresponding to the step (19c) are expanded to expand the thermoplastic resin (R) , thereby having a large number of voids inside and the skin layer (21). And the inflated layer (22) surrounded by
The rising portion (19d) excluding the stepped portion (19c) and the top wall (19b) of the protruding portion (19) does not substantially increase the volume of the cavity (33) corresponding to the rising portion (19d) during molding. A resin molded body characterized by being a solid having no voids inside. 請求項１の樹脂成形体において、
上記段部（１９ｃ）は、上記突出部（１９）の全周に亘って設けられていることを特徴とする樹脂成形体。 In the resin molding of Claim 1,
The step (19c) is provided over the entire circumference of the protrusion (19) . ドアアウタパネル（３）とドアインナパネル（５）とを備えたドア本体（７）の該ドアインナパネル（５）にキャリアプレート（９）が取り付けられ、該キャリアプレート（９）をドアトリム（１３）が車内側から被うように上記ドアインナパネル（５）に取り付けられた自動車のドアであって、
上記キャリアプレート（９）は、請求項１又は２の樹脂成形体で成形され、上記突出部（１９）の先端が車内側及び車外側の少なくともいずれか一方に位置づけられていることを特徴とする自動車のドア。 Door outer panel (3) and a door inner panel (5) and the door inner panel of the door body (7) with a (5) carrier plate (9) is attached to, the carrier plate (9) the door trim (13) Is a door of an automobile attached to the door inner panel (5) so as to cover from the inside of the car,
The carrier plate (9) is formed of the resin molded body according to claim 1 or 2, and the tip of the projecting portion (19) is positioned on at least one of the vehicle inner side and the vehicle outer side. Car door.
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JP6658472B2 (en) * 2015-11-30 2020-03-04 日立化成株式会社 Foam molding
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