JP3805872B2

JP3805872B2 - Molding molding method

Info

Publication number: JP3805872B2
Application number: JP27950697A
Authority: JP
Inventors: 正敏杉浦; 浩二井上; 幸一村口
Original assignee: Inoac Corp
Current assignee: Inoac Corp
Priority date: 1997-09-26
Filing date: 1997-09-26
Publication date: 2006-08-09
Anticipated expiration: 2017-09-26
Also published as: JPH1199565A

Description

【０００１】
【発明の属する技術分野】
この発明は自動車等に取り付けられるモールディングの成形方法に関する。
【０００２】
【従来の技術】
例えば、図８に示すように、自動車Ｃの側面のドア部分Ｄｆ，Ｄｒには、装飾やドアの保護等のため、車体の前後方向に沿って、細長い帯状のプラスチック製モールディングＭ１，Ｍ２が取り付けられている。
【０００３】
図８の符号Ａで示す部分の断面を示す図９に示すように、前記モールディングＭ１，Ｍ２は端末部付近の裏面にあらかじめクリップ５０が固定され、車体に形成された孔に前記クリップ５０を挿入することによってモールディングＭ１，Ｍ２の端末部が車体に取り付けられるようになっている。なお、前記モールディングの裏面にはピン等よりなる位置決め部材（図示せず）を所要位置に固定しておき、車体に形成した位置決め孔に前記位置決め部材を挿入してモールディング取り付け時の位置決めを行う場合もある。
【０００４】
また、前記自動車用モールディングにおいては、ドアの開閉時におけるモールディング端末部同士の干渉防止、あるいは意匠上の観点から所定の形状とされている。すなわち、後側モールディングＭ２の前部端末部Ｍ２ｆは、後側ドアＤｒの解放時に前側ドアＤｆまたは前側モールディングＭ１の後端との干渉を避けるために、該端末部Ｍ２ｆを端部側薄肉部分Ｍｃ１と厚み徐変部分Ｍｃ２とからなる形状変化部Ｍｃを介して一般部Ｍｏに至るいわゆる背切り状に形成されている。
【０００５】
従来、前記モールディングの裏面へクリップあるいは位置決め部材等の突部材を固定する方法は、接着剤，超音波溶着により行うのが一般的であった。しかし、前記接着剤による突部材の固定は、モールディングの裏面と突部材間の接着強度が充分とは言い難い問題があった。また、前記接着剤による方法および超音波溶着による方法では、何れも、突部材の固定とモールディングの成形を別工程で行わなければならず、工数がかかるといった問題もあった。
【０００６】
また、前記モールディング裏面へのクリップの固定と、前記形状変化部の賦形との両方を一度に行う成形方法として、次に示す射出成形によるものと高周波加熱によるもの（特開昭６１−２３５１１４号公報参照）が提案されている。
【０００７】
射出成形によるモールディングの成形は、図１０に示すように、まず、所望のモールディングに合わせて所定断面形状に成形された所要寸法の押出成形品６０の端部６１を、モールディングの端末形状からなるキャビティ６６を有する射出成形型６５に配置し、該押出成形品６０の端部６１を前記キャビティ６６に臨むように位置させる。その際、前記キャビティ６６には前記クリップ５０をセットしておく。次いで、前記キャビティ６６に溶融樹脂を射出して前記クリップ５０と一体になったモールディングの端末部を、前記押出成形品６０の端部６１に形成し、所望のモールディングを得る。
【０００８】
それに対して高周波加熱によるモールディングの成形は、図１１に示すように、モールディングの端末部形状からなる型面８２，８６が形成された分割型８１，８５を用い、前記モールディング端末部の裏面側を賦形する型面８６に、誘電損失の少ない材質からなるクリップ９０をセットし、前記型面８１，８５間に裏側を切除した押出成形品７０の端末部７１を配置し、該端末部７１をプレスするとともに高周波加熱により軟化させて固定用クリップ９０の基部９１を裏面に埋没させたモールディングの端末部を賦形して形成するものである。なお、前記分割型８１，８５は、誘電損失の少ない材質で構成される。
【０００９】
しかし、前記射出成形による場合は、射出成形された端末部分と押出成形品部分と間に境界線が発生し、モールディングの外観が損なわれる問題がある。また、前記高周波加熱による場合は、クリップ９０が高周波加熱によって加熱軟化しない材質（ポリアセタール樹脂等）に制限され、強度やコスト等の観点から固定用クリップの材質を自由に選定できない問題がある。
【００１０】
【発明が解決しようとする課題】
この発明は、前記の点に鑑みなされたもので、形状変化部の成形と同時にクリップや位置決め部材等の突部材を強固に固定でき、しかも使用できる突部材の材質に制約が少なく、かつ得られる形状変化部の外観が良好なモールディングの成形方法を提供するものである。
【００１１】
【課題を解決するための手段】
この発明は、押出成形品の所要部の裏面を所要量除去して当該裏面に賦形用空間を形成する裏面加工工程と、前記押出成形品の意匠面側を賦形する意匠面側分割型と裏面側を賦形する裏面側分割型とよりなるプレス型に対し、前記裏面側分割型の型面にクリップや位置決め部品等の突部材を脱着可能に保持して該突部材の基部を意匠面側分割型へ向けて突出させる突部材保持工程と、前記押出成形品の裏面除去部を加熱軟化させる加熱軟化工程と、前記突部材の位置と対応する押出成形品の裏面に溶融樹脂を所要量注入した後、前記押出成形品をプレス型でプレスして裏面除去部を賦形するとともに前記突部材を押出成形品の裏面側に固定させる樹脂注入・プレス工程、とを含むことを特徴とするモールディングの成形方法に係る。
【００１２】
【発明の実施の形態】
以下本発明の実施例について図面を用いて説明する。図１はこの発明の一実施例において押出成形品の裏面加工工程を示す斜視図、図２は同実施例における突部材保持工程から樹脂注入・プレス工程までを示す断面図、図３は他の実施例における押出成形品の裏面加工工程を示す斜視図、図４は同実施例に用いる裏面側分割型の型面を示す斜視図、図５は同実施例における樹脂注入・プレス工程を示す断面図、図６はさらに他の実施例における樹脂注入・プレス工程を示す断面図、図７は位置決め部材の一実施例の断面図である。
【００１３】
この発明は、所要部に形状変化部を有するモールディングを成形する方法であって、裏面加工工程と、突部材保持工程と、前記加熱軟化工程と、樹脂注入・プレス工程とを含むものである。なお、以下の実施例では端末部が形状変化部とされ、突部材がクリップからなるモールディングの成形を主として説明する。
【００１４】
まず、裏面加工工程においては、図１に示すように、あらかじめ所望のモールディング形状に合わせて所定断面形状で押出成形され、所要長に切断された塩化ビニル樹脂等のプラスチック製押出成形品１０に対し、その端末部１１の裏面１２をカッターやエンドミル等の切削装置で所要量除去し、賦形用空間１５を形成する。この賦形用空間１５は、モールディングの形状変化部に対応した形状及び深さにするのが好ましい。すなわち、形状変化部における厚みの大なる部分と対応する部分については浅く形成し、逆に形状変化部における厚みの小なる部分と対応する部分については深く形成するのである。
【００１５】
また、前記賦形用空間１５の存在する裏面除去部１３（賦形用空間１５が存在する部分全体を示し、意匠面１４側部分までも含む。以下同じ。）付近の一般部１６裏面１７には、突部材固定用凹部２０を切削等により形成する。この突部材固定用凹部２０は、後記突部材の基部よりもわずかに大とされ、特に深さは突部材の基部の高さよりも大にするのが好ましい。
【００１６】
突部材保持工程では、図２の（２−Ａ）のように、プレス型３０の裏面側分割型３５の型面３７に突部材４０を脱着可能に保持する。プレス型３０は、前記押出成形品１０の裏面除去部１３を所望形状に賦形するとともに、突部材４０を前記押出成形品１０の一般部１６裏面１７の突部材固定用凹部２０に配置固定するためのもので、前記押出成形品１０の意匠面１４側を賦形する意匠面側分割型３１と裏面１２側を賦形する裏面側分割型３５とより構成される。
【００１７】
前記意匠面側分割型３１には、モールディングの端末部（形状変化部）に応じた形状からなる裏面除去部用型面３２と一般部用型面３３とが形成されている。また裏面側分割型３５にも裏面除去部用型面３６と一般部用型面３７とが形成されており、この例の裏面側分割型３５においては裏面除去部用型面３６と一般部用型面３７とは面一となっている。さらに、前記裏面側分割型３５の一般部用型面３７には、前記押出成形品１０の突部材固定用凹部２０と対応する位置に突部材保持用凹部３８が形成されている。この突部材保持用凹部３８は、突部材４０を脱着可能に保持するためのもので、突部材４０の頭部４１が挿入時の摩擦抵抗により保持される大きさからなり、かつ突部材４０の基部４２が突部材保持用凹部３８周縁の型面３７から意匠面側型３１を向いて突出保持される深さからなる。
【００１８】
突部材４０は、この例ではモールディングを車体等に取り付ける際に用いるクリップからなり、プラスチック等の適宜の材質及び構造とされるが、この例にあっては軸部４３の径より拡大した頭部４１及び基部４２が軸部４３の端に形成された合成樹脂製からなる。また、前記軸部４３側面には基部４２から所定距離離して鍔４４が形成されている。この鍔４４は、前記裏面側分割型３５の突部材保持用凹部３８に突部材４０の頭部４１を挿入した際に、軸部４３周囲の突部材保持用凹部３８外面を塞ぎ、注入・プレス工程時に溶融樹脂が突部材保持用凹部３８に侵入して硬化するのを防ぐためのものである。
【００１９】
なお、前記突部材４０は、ピン等の位置決め部品とされることもある。図７に位置決め部品からなる突部材４０Ａを示す。この突部材４０Ａにおける符号４１Ａは車体の位置決め孔に挿入されるピン状の頭部、４２Ａは軸部、４３Ａは基部、４４Ａは鍔である。また、前記鍔４４Ａには、前記裏面側分割型３５の突部材保持用凹部３８の周囲に立設した保持ピン（図示せず）が挿入される孔４５Ａが形成されており、該保持ピンの挿入によって、突部材４０Ａが裏面側分割型３５に脱着可能に保持される。勿論、クリップおよび位置決め部品としての前記突部材は、前記の形状に限られるものではない。
【００２０】
加熱軟化工程では、図２の（２−Ｂ）のように、前記裏面加工工程後の押出成形品１０の裏面除去部１３を、ヒーター等の加熱手段４５によって加熱し軟化させる。このときの加熱温度は、押出成形品１０の端末部１１が変形容易な温度であり、押出成形品の材質や加熱時間等により異なる。押出成形品１０が塩化ビニル樹脂からなるこの例においては、加熱手段４５の温度は、熱源により異なるが熱風の場合、通常３００℃程度に設定される。なお、この裏面除去部１３の加熱の際、押出成形品１０の一般部１６裏面１７の突部材固定用凹部２０を同時に加熱してもよい。また、この加熱軟化工程は、前記押出成形品１０の保持治具（図示せず）に押出成形品１０を保持して行ってもよいが、この例のように前記プレス型３０の意匠面側分割型３１上にセットして行うのが効率的である。
【００２１】
樹脂注入・プレス工程では、まず、図２の（２−Ｃ）のように、前記意匠面側分割型３１に、裏面１２が裏面側分割型３５を向くようにして配置された押出成形品１０の前記突部材固定用凹部２０に、溶融樹脂Ｐを注入する。この溶融樹脂Ｐは、少なくとも押出成形品１０との接着性が良好なものが好ましい。例えば、押出成形品１０が塩化ビニル樹脂からなる場合には塩化ビニル樹脂とするが好ましい。その際、溶融樹脂Ｐは突部材４０に対しても接着性を有するものが好ましいが、この要件は必ずしも必要ではない。その理由は、前記突部材４０の基部４２は軸部４３よりも径が大きくなっており、加えて突部材４０の基部４２の高さが前記突部材固定用凹部２０の深さよりも小さいため、該凹部２０内の溶融樹脂Ｐ内に突部材４０の基部４２が挿入された際には、該溶融樹脂Ｐが突部材４０の基部４２を包囲して固定用凹部２０に接着し、前記突部材４０の基部４２がアンカー効果を発揮して確実に押出成形品１０に固定されるからである。また、突部材固定用凹部２０への溶融樹脂Ｐの注入量は、前記突部材４０の基部４２が突部材固定用凹部２０に挿入された際に、該突部材４０の基部４２を包囲して凹部２０内を満たす量が好ましい。
【００２２】
次いで、図２の（２−Ｄ）のように、前記意匠面側分割型３１と裏面側分割型３５を閉じて押出成形品１０をプレスする。このプレスによって、押出成形品１０の裏面除去部１３では意匠面１４側の樹脂が前記賦形用空間１５へ押されて変形し、該賦形用空間１５を満たして型面形状に賦形され、所望の端末部１１が形成される。一方、前記裏面側分割型３５の型面３７に保持されている突部材４０は、前記プレス型３０の閉型によって、裏面側分割型３５の型面３７から突出している突部材４０の基部４２が、押出成形品１０裏面１２の突部材固定用凹部２０内の前記溶融樹脂Ｐ内に挿入され、該突部材４０の基部４２周囲を包囲した溶融樹脂Ｐの硬化によって押出成形品１０の裏面に固定される。
【００２３】
前記押出成形品１０の冷却後、プレスを解除して成形品を取り出せば、所望の端末部形状からなって、しかもその端末部付近の裏面に突部材が強固に固定されたモールディングが得られる。
【００２４】
次にその他の実施例について説明する。前記実施例においては、裏面加工工程時に押出成形品１０の裏面に突部材固定用凹部２０を形成しているが、押出成形された押出成形品の裏面形状によっては前記突部材固定用凹部２０をわざわざ形成しなくてもよいことがある。例えば、図３の（３−Ａ）図に示す押出成形品１００のように、押出成形時に形成された溝１０１を押出成形品の裏面に長手方向に沿って有する場合が挙げられる。（３−Ｂ）図は、裏面加工工程によって裏面所要部が除去されて賦形用空間１１５が形成された状態を示す。符号１１３は、前記賦形空間１１５の形成された裏面除去部、１１６は一般部、１１７は一般部裏面である。
【００２５】
また図４に示すプレス型の裏面側分割型１２０は、前記溝１０１が裏面に形成された押出成形品１００に対して用いられるもので、型面の前記溝１０１に対応する位置に当該溝１０１に入る突条１２１が形成され、その突条１２１の途中が切り欠かれて平坦な型面１２２とされ、該平坦な型面１２２に突部材保持用凹部１２８が形成されている。
【００２６】
そして、前記突部材保持工程において図１および図２に示した前記実施例と同じ突部材４０を、前記突部材保持用凹部１２８に挿入保持する。その後、前記加熱軟化工程を行い、続く樹脂注入・プレス工程時に、図５に示すように、プレス型の意匠面側分割型１３０の型面に位置する押出成形品１００の溝１０１に溶融樹脂Ｐを所要量注入する。この注入位置は、前記裏面側分割型１２０に保持された突部材４０に合わせた位置とされる。次いで、前記裏面側分割型１２０と意匠面側分割型１３０とを近接させて、前記押出成形品１００をプレスし、所望のモールディングを得る。
【００２７】
さらに前記の各実施例においては、いずれもモールディングの一般部の裏面に突部材を設ける場合について示したが、本発明では、前記形状変化部、すなわち押成形品の裏面除去部に突部材を設けるようにしてもよい。図６はその場合の実施例における樹脂・注入プレス工程を示す断面図である。この実施例においては、プレス型の裏面側分割型２２０の型面には、前記裏面加工工程によって形成された押出成形品２００の裏面除去部２１３の賦形用空間２１５と対応する位置に突部材保持用凹部２２８が形成され、該突部材保持用凹部２２８に前記突部材４０が保持される。そして、前記裏面加工工程および加熱軟化工程後の樹脂注入・プレス工程時に、前記賦形用空間２１５内における前記突部材４０と対応する部分に溶融樹脂Ｐを注入し、裏面側分割型２２０と意匠面側分割型２３０を近接させて押出成形品２００をプレスする。それによって、前記押出成形品２００の裏面除去部２１３を賦形するとともに、該裏面除去部２１３の裏面に、前記溶融樹脂Ｐの硬化樹脂で突部材４０を固定し、所望のモールディングを得る。
【００２８】
【発明の効果】
以上図示し説明したように、この発明のモールディングの成形方法によれば、所望の形状変化部を有するモールディングの成形と同時にモールディング裏面に取付用クリップや位置決め部品等の突部材も固定できるため、極めて作業性に優れる。しかも、形状変化部には射出成形による場合と異なり、見苦しい境界線もなく、極めて外観が良好である。また、前記突部材の基部は、該突部材の基部を包囲して硬化した樹脂によって強固に押出成形品に固定されている。さらに、前記突部材は、その基部を突部材の軸部より大なる形状とすれば、前記突部材の基部を包囲して硬化した樹脂に対しアンカー効果を発揮するため、突部材の固定力が極めて大きくなるとともに、前記アンカー効果によって固定されるため、突部材の材質が限定されなくなる。
【図面の簡単な説明】
【図１】この発明の一実施例において裏面加工工程を示す斜視図である。
【図２】同実施例でクリップ保持工程からプレス工程までを示す断面図である。
【図３】他の実施例における押出成形品の裏面加工工程を示す斜視図である。
【図４】図３の実施例に用いる裏面側分割型の型面を示す斜視図である。
【図５】図３の同実施例における樹脂注入・プレス工程を示す断面図である。
【図６】さらに他の実施例における樹脂注入・プレス工程を示す断面図である。
【図７】位置決め部材の一実施例の断面図である。
【図８】モールディングの取り付けられた自動車の側面図である。
【図９】図８のＡ部の拡大断面図である。
【図１０】従来の射出成形によるモールディングの成形を示す断面図である。
【図１１】従来の高周波加熱によるモールディングの成形を示す断面図である。
【符号の説明】
１０押出成形品
１１押出成形品の所要部（端末部）
１２押出成形品の所要部の裏面
１３押出成形品の裏面除去部
１４押出成形品の意匠面
１５賦形用空間
１６押出成形品の一般部
１７押出成形品の一般部の裏面
２０突部材固定用凹部
３０プレス型
３１意匠面側分割型
３２意匠面側分割型の裏面除去部用型面
３３意匠面側分割型の一般部用型面
３５裏面側分割型
３６裏面側分割型の裏面除去部用型面
３７裏面側分割型の一般部用型面
３８突部材用固定用凹部
４０突部材
４２突部材の基部
Ｐ溶融樹脂[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method for a molding attached to an automobile or the like.
[0002]
[Prior art]
For example, as shown in FIG. 8, elongated plastic strips M1 and M2 are attached to the door portions Df and Dr on the side surface of the automobile C along the front-rear direction of the vehicle body for decoration and door protection. It has been.
[0003]
As shown in FIG. 9 which shows a cross section of the portion indicated by the symbol A in FIG. 8, the moldings M1 and M2 have a clip 50 fixed in advance on the back surface near the terminal portion, and the clip 50 is inserted into a hole formed in the vehicle body. By doing so, the terminal portions of the moldings M1 and M2 are attached to the vehicle body. A positioning member (not shown) made of pins or the like is fixed to a required position on the back surface of the molding, and the positioning member is inserted into a positioning hole formed in the vehicle body for positioning when the molding is attached. There is also.
[0004]
Moreover, in the said automotive molding, it is set as the predetermined | prescribed shape from the viewpoint of the prevention of interference between molding terminal parts at the time of opening and closing of a door, or a design. That is, the front terminal portion M2f of the rear molding M2 is connected to the end thin portion Mc1 in order to avoid interference with the front door Df or the rear end of the front molding M1 when the rear door Dr is released. And a so-called back-cut shape that reaches the general portion Mo via a shape changing portion Mc composed of a gradually changing thickness portion Mc2.
[0005]
Conventionally, a method of fixing a projecting member such as a clip or a positioning member to the back surface of the molding is generally performed by an adhesive or ultrasonic welding. However, the fixing of the protruding member with the adhesive has a problem that it is difficult to say that the adhesive strength between the rear surface of the molding and the protruding member is sufficient. Further, in both the method using the adhesive and the method using ultrasonic welding, there is a problem in that the fixing of the projecting member and the molding of the molding must be performed in separate steps, which requires man-hours.
[0006]
Further, as a molding method for performing both the fixing of the clip to the molding back surface and the shaping of the shape changing portion at a time, the following injection molding and high frequency heating are used (Japanese Patent Laid-Open No. Sho 61-235114). (See the publication).
[0007]
As shown in FIG. 10, molding by injection molding is performed by first forming an end portion 61 of an extruded product 60 having a predetermined dimension in a predetermined cross-sectional shape according to a desired molding into a cavity having a molding end shape. The end portion 61 of the extruded product 60 is positioned so as to face the cavity 66. At that time, the clip 50 is set in the cavity 66. Next, a molten resin is injected into the cavity 66 to form an end portion of the molding integrated with the clip 50 at the end 61 of the extruded product 60 to obtain a desired molding.
[0008]
On the other hand, as shown in FIG. 11, molding of the molding by high-frequency heating is performed by using split molds 81 and 85 in which mold surfaces 82 and 86 having the shape of the molding terminal portion are formed. A clip 90 made of a material having a small dielectric loss is set on the mold surface 86 to be shaped, and a terminal portion 71 of the extruded product 70 with the back side cut out is disposed between the mold surfaces 81 and 85, and the terminal portion 71 is The molding end portion is formed by pressing and softening by high-frequency heating so that the base 91 of the fixing clip 90 is buried in the back surface. The split dies 81 and 85 are made of a material having a small dielectric loss.
[0009]
However, in the case of the injection molding, there is a problem that a boundary line is generated between the injection-molded terminal portion and the extrusion molded product portion, and the appearance of the molding is impaired. Further, in the case of the high frequency heating, there is a problem that the clip 90 is limited to a material (polyacetal resin or the like) that is not softened by high frequency heating, and the material of the fixing clip cannot be freely selected from the viewpoint of strength and cost.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned points, and at the same time as forming the shape changing portion, it is possible to firmly fix the projecting member such as a clip or a positioning member, and there are few restrictions on the material of the projecting member that can be used. It is an object of the present invention to provide a molding method having a good appearance of the shape changing portion.
[0011]
[Means for Solving the Problems]
The present invention includes a back surface processing step for forming a shaping space on the back surface by removing a required amount of the back surface of a required portion of the extruded product, and a design surface side split mold for shaping the design surface side of the extruded product. And a press die composed of a back side split mold for shaping the back side, and a projecting member such as a clip or a positioning part is detachably held on the mold surface of the back side split mold to design the base of the projecting member Protruding member holding step for projecting toward the surface-side split mold, heating softening step for heating and softening the back surface removal portion of the extruded product, and molten resin required for the back surface of the extruded product corresponding to the position of the protruding member And a resin injection / pressing step for shaping the back surface removal portion by pressing the extruded product with a press die and fixing the protruding member on the back surface side of the extruded product after the amount is injected. Related to the molding method.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a back surface processing step of an extruded product in one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a process from a projecting member holding step to a resin injection / pressing step, and FIG. FIG. 4 is a perspective view showing a mold surface of a back side split mold used in the embodiment, and FIG. 5 is a cross section showing a resin injection / press process in the embodiment. FIG. 6 is a sectional view showing a resin injection / pressing process in still another embodiment, and FIG. 7 is a sectional view of an embodiment of a positioning member.
[0013]
The present invention is a method for forming a molding having a shape changing portion in a required portion, and includes a back surface processing step, a projecting member holding step, the heat softening step, and a resin pouring / pressing step. In the following embodiments, description will be mainly given of molding of a molding in which the terminal portion is a shape changing portion and the projecting member is a clip.
[0014]
First, in the back surface processing step, as shown in FIG. 1, for a plastic extruded product 10 such as a vinyl chloride resin which is extruded in a predetermined cross-sectional shape in advance according to a desired molding shape and cut to a required length. The required amount of the back surface 12 of the terminal portion 11 is removed by a cutting device such as a cutter or an end mill to form a shaping space 15. It is preferable that the shaping space 15 has a shape and depth corresponding to the shape change portion of the molding. That is, the portion corresponding to the thick portion in the shape changing portion is formed shallow, and conversely, the portion corresponding to the thin portion in the shape changing portion is formed deep.
[0015]
Further, on the back surface 17 of the general portion 16 in the vicinity of the back surface removing portion 13 in which the shaping space 15 exists (shows the entire portion where the shaping space 15 exists and includes the design surface 14 side portion, the same applies hereinafter). The projecting member fixing recess 20 is formed by cutting or the like. The protruding member fixing recess 20 is slightly larger than the base portion of the protruding member described later, and the depth is preferably larger than the height of the base portion of the protruding member.
[0016]
In the projecting member holding step, the projecting member 40 is detachably held on the mold surface 37 of the back-side split mold 35 of the press die 30 as shown in FIG. The press die 30 shapes the back surface removal portion 13 of the extruded product 10 into a desired shape, and disposes and fixes the projecting member 40 in the projecting member fixing recess 20 on the back surface 17 of the general portion 16 of the extruded product 10. Therefore, the design surface side split mold 31 for shaping the design surface 14 side of the extruded product 10 and the back side split mold 35 for shaping the back surface 12 side are configured.
[0017]
The design surface side split mold 31 is formed with a back surface removal portion mold surface 32 and a general portion mold surface 33 each having a shape corresponding to a molding terminal portion (shape changing portion). Further, the rear surface side split mold 35 is also provided with a back surface removal portion mold surface 36 and a general portion mold surface 37. In the back surface side split mold 35 of this example, the back surface removal portion mold surface 36 and the general portion mold surface are used. It is flush with the mold surface 37. Further, the general-part mold surface 37 of the back-side split mold 35 is formed with a projecting member holding recess 38 at a position corresponding to the projecting member fixing recess 20 of the extruded product 10. The protruding member holding recess 38 is configured to hold the protruding member 40 so as to be detachable. The protruding member 40 has a size that allows the head 41 of the protruding member 40 to be held by frictional resistance during insertion. The base 42 has such a depth that the base 42 protrudes from the mold surface 37 at the periphery of the projecting member holding recess 38 toward the design surface side mold 31.
[0018]
In this example, the projecting member 40 is made of a clip used when the molding is attached to the vehicle body or the like, and is made of an appropriate material and structure such as plastic. In this example, the head is enlarged from the diameter of the shaft 43. 41 and the base part 42 are made of a synthetic resin formed at the end of the shaft part 43. A flange 44 is formed on the side surface of the shaft portion 43 at a predetermined distance from the base portion 42. The flange 44 closes the outer surface of the protruding member holding recess 38 around the shaft portion 43 when the head 41 of the protruding member 40 is inserted into the protruding member holding recess 38 of the rear surface side split mold 35, so that injection / pressing is performed. This is to prevent the molten resin from entering the protruding member holding recesses 38 and curing during the process.
[0019]
The protruding member 40 may be a positioning component such as a pin. FIG. 7 shows a protruding member 40A made of a positioning component. Reference numeral 41A in the projecting member 40A is a pin-shaped head inserted into the positioning hole of the vehicle body, 42A is a shaft portion, 43A is a base portion, and 44A is a flange. Further, the flange 44A is formed with a hole 45A into which a holding pin (not shown) erected around the protruding member holding recess 38 of the rear surface side split mold 35 is inserted. By the insertion, the protruding member 40A is detachably held on the rear surface side split mold 35. Of course, the protruding member as the clip and the positioning component is not limited to the shape described above.
[0020]
In the heat softening step, as shown in FIG. 2 (2-B), the back surface removal portion 13 of the extruded product 10 after the back surface processing step is heated and softened by a heating means 45 such as a heater. The heating temperature at this time is a temperature at which the end portion 11 of the extruded product 10 can be easily deformed, and varies depending on the material of the extruded product, the heating time, and the like. In this example in which the extruded product 10 is made of vinyl chloride resin, the temperature of the heating means 45 varies depending on the heat source, but is usually set to about 300 ° C. in the case of hot air. In addition, when this back surface removal part 13 is heated, you may heat the projection member fixing recessed part 20 of the general part 16 back surface 17 of the extrusion molded product 10 simultaneously. In addition, the heat softening step may be performed by holding the extruded product 10 on a holding jig (not shown) of the extruded product 10, but the design surface side of the press die 30 as in this example. It is efficient to set it on the split mold 31.
[0021]
In the resin pouring / pressing step, first, as shown in FIG. 2 (2-C), the extruded product 10 is arranged on the design surface side split mold 31 so that the back surface 12 faces the back surface side split mold 35. The molten resin P is injected into the protruding member fixing recess 20. The molten resin P preferably has at least good adhesion to the extruded product 10. For example, when the extruded product 10 is made of a vinyl chloride resin, it is preferably a vinyl chloride resin. At that time, the molten resin P preferably has adhesiveness to the protruding member 40, but this requirement is not always necessary. The reason is that the base portion 42 of the projecting member 40 has a diameter larger than that of the shaft portion 43, and in addition, the height of the base portion 42 of the projecting member 40 is smaller than the depth of the projecting member fixing recess 20. When the base 42 of the projecting member 40 is inserted into the molten resin P in the recess 20, the molten resin P surrounds the base 42 of the projecting member 40 and adheres to the fixing recess 20. This is because the 40 base portions 42 exhibit the anchor effect and are securely fixed to the extruded product 10. Further, the amount of the molten resin P injected into the projecting member fixing recess 20 is such that when the base 42 of the projecting member 40 is inserted into the projecting member fixing recess 20, the base 42 of the projecting member 40 is surrounded. An amount that fills the recess 20 is preferable.
[0022]
Next, as shown in FIG. 2 (2-D), the design surface side split mold 31 and the back side split mold 35 are closed to press the extruded product 10. By this pressing, the resin on the design surface 14 side is pushed into the shaping space 15 at the back surface removal portion 13 of the extruded product 10 and deforms, and fills the shaping space 15 and is shaped into a mold surface shape. A desired terminal portion 11 is formed. On the other hand, the projecting member 40 held on the mold surface 37 of the back surface side split mold 35 is a base 42 of the projecting member 40 projecting from the mold surface 37 of the back surface side split mold 35 by the closing of the press die 30. Is inserted into the molten resin P in the protruding member fixing recess 20 on the back surface 12 of the extruded product 10, and the molten resin P surrounding the base portion 42 of the protruding member 40 is cured on the back surface of the extruded product 10. Fixed.
[0023]
After the extrusion-molded product 10 is cooled, if the press is released and the molded product is taken out, a molding having a desired terminal portion shape and having a protruding member firmly fixed to the back surface in the vicinity of the terminal portion is obtained.
[0024]
Next, other embodiments will be described. In the above embodiment, the protruding member fixing recess 20 is formed on the back surface of the extruded product 10 during the back surface processing step. However, depending on the back surface shape of the extruded product, the protruding member fixing recess 20 may be formed. It may not be necessary to form it. For example, the case where it has the groove | channel 101 formed at the time of extrusion molding on the back surface of an extrusion molded product along a longitudinal direction like the extrusion molded product 100 shown to the (3-A) figure of FIG. 3 is mentioned. (3-B) The figure shows a state where the back surface required portion is removed by the back surface processing step and the shaping space 115 is formed. Reference numeral 113 denotes a back surface removing portion where the shaping space 115 is formed, 116 denotes a general portion, and 117 denotes a general portion back surface.
[0025]
4 is used for the extruded product 100 in which the groove 101 is formed on the back surface, and the groove 101 is located at a position corresponding to the groove 101 on the mold surface. A protruding ridge 121 is formed, the middle of the protruding ridge 121 is cut out to form a flat mold surface 122, and a protruding member holding recess 128 is formed in the flat mold surface 122.
[0026]
In the protruding member holding step, the same protruding member 40 as that of the embodiment shown in FIGS. 1 and 2 is inserted and held in the protruding member holding recess 128. Thereafter, the heat softening step is performed, and in the subsequent resin pouring / pressing step, as shown in FIG. 5, the molten resin P is inserted into the groove 101 of the extruded product 100 located on the mold surface of the design surface side split die 130 of the press die. Inject the required amount. This injection position is a position that matches the projecting member 40 held by the back side split mold 120. Next, the back surface side split mold 120 and the design surface side split mold 130 are brought close to each other, and the extruded product 100 is pressed to obtain a desired molding.
[0027]
Further, in each of the above-described embodiments, the case where the protruding member is provided on the back surface of the general portion of the molding has been shown. However, in the present invention, the protruding member is provided on the shape changing portion, that is, the back surface removing portion of the molded product You may do it. FIG. 6 is a cross-sectional view showing a resin / injection press process in the embodiment in that case. In this embodiment, a projecting member is formed on the mold surface of the back side split mold 220 of the press die at a position corresponding to the shaping space 215 of the back side removal portion 213 of the extruded product 200 formed by the back side processing step. A holding recess 228 is formed, and the protruding member 40 is held in the protruding member holding recess 228. Then, during the resin injection / pressing step after the back surface processing step and the heat softening step, the molten resin P is injected into the portion corresponding to the protruding member 40 in the shaping space 215, and the back side split mold 220 and the design The extruded product 200 is pressed by bringing the surface side split mold 230 close to each other. Thereby, the back surface removal portion 213 of the extruded product 200 is shaped, and the protruding member 40 is fixed to the back surface of the back surface removal portion 213 with the cured resin of the molten resin P to obtain a desired molding.
[0028]
【The invention's effect】
As shown and described above, according to the molding method of the present invention, since a molding member having a desired shape change portion can be molded simultaneously with a projecting member such as a mounting clip or positioning component on the molding back surface, Excellent workability. Moreover, unlike the case of injection molding, the shape change portion has no unsightly boundary line and has a very good appearance. Further, the base portion of the protruding member is firmly fixed to the extruded product by a resin that surrounds and hardens the base portion of the protruding member. Further, if the base of the projecting member is larger than the shaft of the projecting member, the projecting member exerts an anchor effect on the cured resin surrounding the base of the projecting member. Since it becomes very large and is fixed by the anchor effect, the material of the protruding member is not limited.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a back surface processing step in an embodiment of the present invention.
FIG. 2 is a sectional view showing a process from a clip holding process to a pressing process in the same example.
FIG. 3 is a perspective view showing a back surface processing step for an extrusion-molded product according to another embodiment.
4 is a perspective view showing a rear surface side split mold surface used in the embodiment of FIG. 3; FIG.
5 is a cross-sectional view showing a resin injection / pressing process in the same embodiment as FIG. 3;
FIG. 6 is a cross-sectional view showing a resin injection / press process in still another embodiment.
FIG. 7 is a cross-sectional view of an embodiment of a positioning member.
FIG. 8 is a side view of an automobile with a molding attached.
9 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 10 is a cross-sectional view showing molding of a molding by conventional injection molding.
FIG. 11 is a cross-sectional view showing molding of a molding by conventional high-frequency heating.
[Explanation of symbols]
10 Extruded product 11 Required part (terminal part) of extruded product
12 Back surface of a required portion of an extruded product 13 Back surface removing portion 14 of an extruded product Design surface 15 of an extruded product 15 Shape forming space 16 General portion of an extruded product 17 Back surface of a general portion of an extruded product 20 For fixing a protruding member Recess 30 Press mold 31 Design surface side split mold 32 Design surface side split mold back surface removal part mold surface 33 Design surface side split mold general part mold surface 35 Back surface side split mold 36 Back surface side split mold back surface removal part Mold surface 37 Mold surface 38 for the general part of the back side divided mold Projecting member fixing recess 40 Projecting member 42 Projecting member base P Molten resin

Claims

押出成形品の所要部の裏面を所要量除去して当該裏面に賦形用空間を形成する裏面加工工程と、
前記押出成形品の意匠面側を賦形する意匠面側分割型と裏面側を賦形する裏面側分割型とよりなるプレス型に対し、前記裏面側分割型の型面にクリップや位置決め部品等の突部材を脱着可能に保持して該突部材の基部を意匠面側分割型へ向けて突出させる突部材保持工程と、
前記押出成形品の裏面除去部を加熱軟化させる加熱軟化工程と、
前記突部材の位置と対応する押出成形品の裏面に溶融樹脂を所要量注入した後、前記押出成形品をプレス型でプレスして裏面除去部を賦形するとともに前記突部材を押出成形品の裏面側に固定させる樹脂注入・プレス工程、
とを含むことを特徴とするモールディングの成形方法。A back surface processing step of removing a required amount of the back surface of the required part of the extruded product to form a shaping space on the back surface; and
In contrast to a press die composed of a design surface side split mold for shaping the design surface side of the extruded product and a back surface side split mold for shaping the back surface side, a clip, a positioning part, etc. on the mold surface of the back side split mold A projecting member holding step of detachably holding the projecting member and projecting the base of the projecting member toward the design surface side split mold,
A heating and softening step of heating and softening a back surface removal portion of the extruded product;
After a required amount of molten resin is injected into the back surface of the extruded product corresponding to the position of the projecting member, the extruded product is pressed with a press die to shape the back surface removal portion and the projecting member is made of the extruded product. Resin injection / pressing process to fix to the back side,
The molding method characterized by including these.

請求項１において、裏面加工工程時に賦形用空間の形成ととともに、押出成形品の一般部裏面に突部材固定用凹部を形成することを特徴とするモールディングの成形方法。2. The molding method according to claim 1, wherein a forming member forming recess is formed on the back surface of the general part of the extruded product together with forming the shaping space during the back surface processing step.

請求項１において、押出成形品の押出成形時に形成された溝を当該押出成形品の裏面長手方向に沿って有し、突部材保持工程時に突部材を前記溝と対応する裏面側分割型の型面に脱着可能に保持し、樹脂注入・プレス工程時に前記突部材と対応する溝の所要部に溶融樹脂を注入し、プレス型によるプレスで裏面除去部の賦形を行うとともに前記溝に突部材を固定させることを特徴とするモールディングの成形方法。The die of the back side split mold according to claim 1, wherein the mold has a groove formed at the time of extrusion molding of the extruded product along the back surface longitudinal direction of the extruded product, and the projecting member corresponds to the groove at the projecting member holding step. Removably held on the surface, molten resin is injected into the required portion of the groove corresponding to the protruding member during the resin injection / pressing process, and the back surface removal portion is shaped by pressing with a press die and the protruding member is inserted into the groove A molding method for forming a molding, characterized in that:

請求項１において、突部材保持工程時に突部材を賦形用空間と対応する裏面側分割型の型面に脱着可能に保持し、樹脂注入・プレス工程時に前記突部材と対応する賦形用空間の所要部に溶融樹脂を注入し、プレス型によるプレスで前記裏面除去部の賦形を行うとともに該裏面除去部の裏側に前記突部材を固定させることを特徴とするモールディングの成形方法。2. The shaping space according to claim 1, wherein the projecting member is detachably held on the mold surface of the back-side split mold corresponding to the shaping space during the projecting member holding step, and the shaping space corresponding to the projecting member during the resin injection / pressing step. A molding method characterized by injecting a molten resin into a required portion of the mold, shaping the back surface removal portion with a press using a press die, and fixing the protruding member to the back side of the back surface removal portion.