JP3662081B2 - Foam molding method - Google Patents

Foam molding method Download PDF

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Publication number
JP3662081B2
JP3662081B2 JP23146096A JP23146096A JP3662081B2 JP 3662081 B2 JP3662081 B2 JP 3662081B2 JP 23146096 A JP23146096 A JP 23146096A JP 23146096 A JP23146096 A JP 23146096A JP 3662081 B2 JP3662081 B2 JP 3662081B2
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Prior art keywords
skin material
mold
foam
core material
skin
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JPH1052826A (en
Inventor
兼司 志知
貞夫 寺西
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Mitsuboshi Belting Ltd
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Mitsuboshi Belting Ltd
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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
    • B29C44/35—Component parts; Details or accessories
    • B29C44/351—Means for preventing foam to leak out from the foaming device during foaming
    • 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
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1257—Joining a preformed part and a lining, e.g. around the edges
    • 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
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3008—Instrument panels

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

Description

【０００１】
【発明の属する技術分野】
本発明は発泡成形方法に係り、特にインストルメントパネルやグローブボックス、コンソールボックスなど自動車内装品に用いられる発泡材料合成樹脂成形品の発泡成形方法に関するものである。
【０００２】
【従来の技術】
従来、インストルメントパネルなど自動車内装品の発泡成形では、例えば図４に示すように上下一対のモールド１、２からなる成形型を用いて、その一方のモールド１に表皮材３を配置し、他方のモールド２に芯材（インサート材）４を配置して、両モールド１、２を型合わせした後、両者の間にウレタンの如き発泡合成樹脂材料を注入し、表皮材３、発泡層５及び芯材４を一体成形することが行われているが、このような従来の発泡成形においては、発泡成形時に表皮材の縁部付近と芯材の接合部を面接触させ、上下両モールド１、２で圧着させるようにしていたため、芯材４と表皮材３の間に注入された発泡材料が上記縁部付近で接合部から漏出し、これが硬化してバリとなり、あるいはイソシアネートとポリオールが混合し、ウレタンとなる化学反応時に発生するガスが圧力の弱い方へ移動し、これが漏れとなってその移動中にウレタンが反応を終えると、ガスが細かい粒となって残り、成形後、トリム工程で除去しなければならず、非常に手間がかかるのみならず、外観上も好ましくなく、更には不良品、廃棄品を生じるという問題があった。
【０００３】
そのため、図５のように表皮材縁部の接合部における上記発泡材料の漏れを防止する技術として発泡材料成形型にスライド型１ａを用いて発泡材料の漏れを防止したり（特開平２−１９７４４３号公報）、表皮材と芯材を発泡成形型に配置し、その間に発泡材料を注入して一体発泡する際に表皮材と芯材との接合部で、図４の如く芯材に凸条１０を設けたり、あるいはシール材（特開平４−２４７９１５号公報）または液状の熱可塑性樹脂（特公平７−１０５３３号公報）を設けることなどが提案されている。
【０００４】
【発明が解決しよしとする課題】
ところが、上記夫々の漏れ防止構造は、一応それなりに有効なものではあるが、表皮材を予めシール形状に設定したり、芯材の製品面以外の形状を設定したりするために手間がかかると共に、発泡成形時、表皮材の縁部が引張られて芯材接合面との間を開いて寸法精度に狂いを生じさせる難点を有していた。
【０００５】
一方、図３に示すように表皮材３を配置した一方のモールド１と、芯材４を配置した他方のモールド２を型合わせする発泡成形型において、前記表皮材３を配置した一方のモールド１の表皮材縁部折曲げ位置にスライド部材６を設け、該部材６をスライドせしめて表皮材３の折曲げ縁部先端部３ａを芯材４に当接せしめることが一部、試みられているが、表皮材３がたわませられていないため、図３（イ）に示すように折曲げ縁部先端部３ａと芯材４との間にスリットＳがあれば、スライド部材６のスライドによって表皮材３が芯材４側へ押し出され、引張られて接合されるとき、即ち、図３（ロ）の状態になるとき、上記スライド部材６による引張りにより角部にはだれが生じて、しかも表皮材３の一部は薄肉状態となり、不良品を招来し易い問題があった。
【０００６】
本発明は上述の如き実状に対処し、特にスライド部材の採用と上記表皮材ならびに芯材の形状を課題とし、セットを容易にし、型設定時間を短縮して成形サイクルの短縮化を促すと共に、シール時における表皮材の引張りによるだれ部をなくし、確実な漏れ防止と不良率の低減を図ることを目的とするものである。
【０００７】
【課題を解決するための手段】
即ち、上記目的に適合する本発明は、表皮材を配置した一方のモールドと、芯材を配置した他方のモールドを型合わせして、それら表皮材と芯材の間に発泡材料を注入し、表皮材と発泡層及び芯材が一体化された発泡成形品を成形する発泡成形型において、前記表皮材を配置する一方のモールドの表皮材縁部折曲げ位置に併設して表皮材折曲げ縁部先端部を芯材に当接せしめるスライド部材をスライト可能に配設せしめた成形型を用いて発泡成形を行うにあたり、一方のモールドに配置した表皮材の縁部を折り曲げ、該折り曲げ部をたわませた状態に維持して、該モールドに併設したスライド部材をスライドさせてその先端に前記表皮材の折曲げ縁部先端部を掛止させ、次いで他方のモールドを型合わせした後、上記スライド部材を、その先端に表皮材の折曲げ縁部を掛止させたまま更にスライドさせ、シールせしめて、表皮材と芯材の間に発泡材料を注入し発泡成形せしめることを特徴とする。
【０００８】
請求項２記載の発明は、上記方法を実施するに際し、好適な手段を付加するもので、表皮材の折曲げ縁部にたわませ部と、その先端にスライド部材を掛止する引掛け状掛止部を予め形成せしめることを特徴とする。
【０００９】
【作用】
上記本発明では、先ずスライド部材が未だスライドされていない状態で、表皮材を一方のモールドに配置する。そして、その表皮材が掛止できる程度までスライド部材をスライドさせてその先端で表皮材折曲げ縁部先端部を掛止維持し、セットする。
【００１０】
この状態で次に芯材が他方のモールドにセットされて下降し、型合わせがなされると、再びスライド部材をスライドさせて表皮材折曲げ縁部先端部を芯材に完全に当接し、シールする。
かくて、発泡材料を注入し、発泡成形を行うことにより発泡後のトリムやバリ取りの手間を不要ならしめ、成形サイクルの短縮をもたらす。
【００１１】
特に請求項２記載のように表皮材にたわませ部と引掛状掛止部を設ければ、スライド部材を表皮材折曲げ縁部先端部が芯材に当接するまでスライドさせたとき、表皮材が引張られても角部にだれを起こすことなく、外観を良好とし、かつシールをより完全として発泡材料の漏れを阻止可能とする。
【００１２】
【発明の実施の形態】
以下、更に本発明の具体的な実施の形態を添付図面と共に説明する。
【００１３】
図１及び図２は本発明発泡成形方法の実施の１態様であり、図において、１は下部モールド、２は上部モールドで発泡成形用金型は上記一対のモールド１、２によって構成されており、本発明の実施にあたり、下部モールド１に表皮材３が、一方、上部モールド２に芯材４が夫々配置されて、これら上下両モールドが型合わせされ、表皮材３の折曲げ縁部先端部３ａが芯材４と接合した状態で表皮材３と芯材４との間に発泡樹脂材料が注入されて発泡成形がなされる。
【００１４】
なお、表皮材３の下部モールド１への配置（セット）に際しては、図示していないが吸引源に連結する吸引機構が設けられ、この真空吸引によって表皮材３を下部モールド１に吸引圧着させる。
ここで、表皮材３は樹脂シート、レザー等、柔軟なものが用いられ、芯材４としては樹脂パネル、金属パネルなどが用いられる。
【００１５】
また発泡材料５としてはポリウレタン、ＰＶＣ、ポリエチレン等の発泡材料が使用可能であるが、最も一般的にはポリウレタンである。
ところで、上述のように表皮材３の折曲げ縁部先端部３ａが芯材４に接合されて、両者の間に発泡材料５が注入され、発泡成形がなされるが、本発明においては特に表皮材３が配置された一方のモールド１の前記表皮材３の縁部折曲げ位置において、該折曲げ縁部先端部３ａを芯材４に当接せしめるためのスライド部材６、例えばスライドプレートが併設されて表皮材３の折曲げ縁部先端部３ａを該スライド部材６により芯材４に当接せしめるようになっている。
【００１６】
なおこの場合、スライド部材６による表皮材３の芯材４への接合をより確実ならしめるため、好ましい態様として図２（イ）に示すように表皮材３の一部にたわませ部７と、その先端にスライド部材６を掛止するための引掛け状の掛止部８が予め形成される。
たわませ部７は他部に比し稍薄肉とすることが有利で、たわませ部７の伸びる前状態における厚みとしては表皮材３の厚みをｔとするとき（０．２〜１．０）ｔとする。
【００１７】
これらたわませ部７と掛止部８はスライド部材６が表皮材３を芯材４側へ摺動移行するとき、これに順応して、表皮材３の形状を整え、表皮材３と芯材４との間のシールをより完全ならしめる上に有利である。
もし、表皮材３がたわませられることなく、図３（イ）に示すように折曲げ縁部先端部３ａと芯材４との間にスリットＳを有しているときは、前述の如くスライド部材６のスライドによって表皮材３が芯材４側へ押し出され、引張られて接合されるとき、即ち、図３（ロ）の状態になるとき、上記スライド部材６による引張りにより角部にはだれが生じて、しかも表皮材３の一部は薄肉状態となり、不良品を招来し易くなる。
従って、図２のように予め、表皮材３の一部をたわませ、かつ先端に掛止部８を設けておくことは頗る好適である。
【００１８】
かくして、本発明では表皮材３を一方のモールド１に配置し、スライド部材６を表皮材３が掛かる程度スライドさせて、該モールド１に表皮材３のセットを完了し、芯材４を配置し、セットした他方のモールド２と型合わせする。このとき、未だ表皮材３の折曲げ縁部先端部３ａは芯材４に対し、当接状態にはないため、再びスライド部材６を最大限スライドさせ、折曲げ縁部先端部３ａを芯材４に密接させる。
従って、スライド部材６のスライド長さは発泡成形品の形態に合わせ、その折曲げ縁部先端部３ａと芯材４との型合わせにもとづいて設定し、若干の余裕をもたせることが好ましい。
そして、上記表皮材３の折曲げ縁部先端部３ａと芯材４とが当接されると、スライド部材６の押圧により充分にシールし、発泡材料であるポリウレタン等を注入し、発泡成形を行う。
【００１９】
このようにして、本発明では表皮材縁部は完全にシールされ、製品面への影響を最小限にしてトリム工程を合理化し、成形時間を短縮することができる。
【００２０】
【発明の効果】
本発明は以上のように表皮材を配置したモールドの該表皮材縁部折曲げ位置に対応して、表皮材の折曲げ縁部先端部を芯材に当接させるべくスライド部材を配設し、発泡成形に先立つ型合わせにおいて一方のモールドに配置された表皮材の折曲げ縁部先端部を該スライド部材により一旦、掛止させ、芯材を配置した他方のモールドと型合わせした後、更にスライドさせてその表皮材折曲げ縁部先端部を芯材と当接させて発泡材料を注入するようにしたものであり、表皮材の折曲げ縁部をたわませた状態に維持してスライド部材でスライドさせるため、スライド部材により完全なシールができ発泡材料の漏れを完全に阻止することができるので、従来、液漏れにより発生したバリ等の発生が解消され、トリム工程を著しく簡易化すると共に、表皮材と芯材のモールド内セットにおいても表皮材をたわませて配置でき、スライド部材によってセットすることができるので、従来の如く手間を要することもなく、成形時間の短縮ならびに製品の外観向上に顕著な効果を有している。
殊に表皮材に一部のたわませ部と、先端部にスライド部材の引掛け状掛止部を予め形成しておくことにより、スライド部材による表皮材のセットはもとより、更に一層のシール効果を高めることができる。
【図面の簡単な説明】
【図１】本発明発泡成形方法の１態様を示す部分断面概要図である。
【図２】本発明発泡成形方法における表皮材の好ましい態様を示し、（イ）は伸びる前の表皮材の部分断面図、（ロ）は伸びた状態の表皮材の状態における部分断面概要図である。
【図３】比較スライド部材のスライド態様を示し、（イ）はスライド前の部分断面図、（ロ）はスライド後の部分断面概要図であてる。
【図４】既知のシール構造の１例を示す断面図である。
【図５】既知のシール構造の他の例を示す断面図である。
【符号の説明】
１ 下部モールド
２ 上部モールド
３ 表皮材
４ 芯材
５ 発泡材料
６ スライド部材
７ たわませ部
８ 掛止部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foam molding method, and more particularly to a foam molding method for a foamed synthetic resin molded product used for automobile interior parts such as an instrument panel, a glove box, and a console box.
[0002]
[Prior art]
Conventionally, in foam molding of automobile interior parts such as instrument panels, for example, as shown in FIG. 4, using a mold composed of a pair of upper and lower molds 1 and 2, a skin material 3 is arranged in one mold 1, and the other After placing the core material (insert material) 4 in the mold 2 and matching the molds 1 and 2, a foamed synthetic resin material such as urethane is injected between them, and the skin material 3, the foam layer 5 and Although the core material 4 is integrally formed, in such conventional foam molding, the vicinity of the edge of the skin material and the joint portion of the core material are brought into surface contact during foam molding, and both the upper and lower molds 1, 2, the foamed material injected between the core material 4 and the skin material 3 leaks from the joint near the edge and hardens to become burrs, or the isocyanate and polyol are mixed. , Urethane When the gas generated during the chemical reaction moves to a weaker pressure, this leaks and the urethane finishes the reaction during the movement, the gas remains as fine particles, which must be removed in the trim process after molding. In addition to being very time-consuming, there is a problem that the appearance is not preferable, and defective products and waste products are generated.
[0003]
Therefore, as shown in FIG. 5, as a technique for preventing the leakage of the foam material at the joint portion of the skin material edge portion, the foam material is prevented from leaking by using the slide mold 1a in the foam material molding die (Japanese Patent Laid-Open No. 2-197443). No.), a skin material and a core material are arranged in a foaming mold, and when the foam material is injected between them and integrally foamed, a joint is formed on the core material as shown in FIG. 10 or a sealing material (JP-A-4-247915) or a liquid thermoplastic resin (JP-B-7-10533) has been proposed.
[0004]
[Problems to be solved by the invention]
However, each of the above leakage prevention structures is effective as such, but it takes time and effort to set the skin material to a seal shape in advance or to set a shape other than the product surface of the core material. At the time of foam molding, the edge of the skin material is pulled to open the space between the core material joint surface, and there is a difficulty in causing a dimensional accuracy error.
[0005]
On the other hand, as shown in FIG. 3, one mold 1 in which the skin material 3 is arranged and one mold 1 in which the skin material 3 is arranged in a mold for molding the other mold 2 in which the core material 4 is arranged. In some cases, a sliding member 6 is provided at a bending position of the outer skin material, and the member 6 is slid so that the bending edge tip portion 3a of the outer skin material 3 is brought into contact with the core material 4. However, since the skin material 3 is not bent, if there is a slit S between the bent edge tip 3a and the core material 4 as shown in FIG. When the skin material 3 is pushed out to the core material 4 side and is joined by being pulled, that is, when it is in the state shown in FIG. Part of the material 3 is in a thin state, leading to defective products I had stomach problems.
[0006]
The present invention copes with the actual situation as described above, particularly with the adoption of the slide member and the shape of the skin material and the core material, facilitates the setting, shortens the mold setting time and promotes shortening of the molding cycle, The purpose is to eliminate the drooping part due to the tension of the skin material at the time of sealing, to surely prevent leakage and reduce the defective rate.
[0007]
[Means for Solving the Problems]
That is, the present invention suitable for the above purpose is to mold one mold in which the skin material is arranged and the other mold in which the core material is arranged, and inject a foam material between the skin material and the core material, In a foam molding die for molding a foam molded product in which a skin material, a foam layer and a core material are integrated, a skin material bending edge is provided along with a skin material edge bending position of one mold on which the skin material is disposed. When foam molding is performed using a molding die in which a slide member that allows the tip of the part to abut against the core material is disposed so as to be able to slide, the edge of the skin material arranged in one mold is folded, and the bent portion is formed. Maintaining the bent state, slide the slide member attached to the mold to hang the end of the bent edge of the skin material on the tip, and then mold the other mold, and then slide the slide The component, beyond A is further slid while keeping hooked the flared flange of the skin material, and allowed the seal, characterized in that allowed to injection foam molding the foaming material between the skin material and the core member.
[0008]
The invention according to claim 2 adds a suitable means when carrying out the above-described method, and is a hook-like shape that hooks a bending portion on the bent edge portion of the skin material and a slide member on the tip thereof. The latching portion is formed in advance.
[0009]
[Action]
In the present invention, first, the skin material is placed in one mold in a state where the slide member has not yet been slid. Then, the sliding member is slid to the extent that the skin material can be hooked, and the tip end portion of the skin material bending edge is hooked and maintained at the tip and set.
[0010]
In this state, the core material is set in the other mold and lowered, and when the molds are aligned, the slide member is slid again to bring the skin material bent edge tip into full contact with the core material and seal. To do.
Thus, by injecting a foam material and performing foam molding, the need for trimming and deburring after foaming is eliminated, and the molding cycle is shortened.
[0011]
In particular, if the skin member is provided with a bent portion and a hook-like latching portion as described in claim 2, when the slide member is slid until the tip end portion of the skin material bent edge comes into contact with the core material, Even if the material is pulled, it does not sag at the corners, has a good appearance, and makes the seal more complete to prevent leakage of the foam material.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
1 and 2 show one embodiment of the foam molding method of the present invention. In the figure, 1 is a lower mold, 2 is an upper mold, and a foam molding die is composed of the pair of molds 1 and 2 described above. In carrying out the present invention, the skin material 3 is disposed on the lower mold 1, while the core material 4 is disposed on the upper mold 2, and both the upper and lower molds are matched to each other. A foamed resin material is injected between the skin material 3 and the core material 4 in a state where 3a is joined to the core material 4 to perform foam molding.
[0014]
When placing (setting) the skin material 3 on the lower mold 1, a suction mechanism (not shown) connected to a suction source is provided, and the skin material 3 is sucked and pressure-bonded to the lower mold 1 by this vacuum suction.
Here, the skin material 3 is a flexible material such as a resin sheet or leather, and the core material 4 is a resin panel, a metal panel, or the like.
[0015]
The foamed material 5 can be a foamed material such as polyurethane, PVC, or polyethylene, but is most commonly polyurethane.
By the way, as described above, the bent edge tip portion 3a of the skin material 3 is joined to the core material 4, and the foam material 5 is injected between them, and foam molding is performed. A slide member 6, for example, a slide plate, is also provided for abutting the leading edge 3 a of the bent edge with the core material 4 at the edge bending position of the skin material 3 of one mold 1 on which the material 3 is disposed. Thus, the bent edge tip 3 a of the skin material 3 is brought into contact with the core material 4 by the slide member 6.
[0016]
In this case, in order to make the joining of the skin material 3 to the core material 4 by the slide member 6 more reliable, as a preferred embodiment, as shown in FIG. A hook-like hooking portion 8 for hooking the slide member 6 is formed in advance at the tip.
It is advantageous to make the bent portion 7 thinner than the other portions, and when the thickness of the skin material 3 is t (0.2 to 1.. 0) Let t.
[0017]
When the sliding member 6 slides and transfers the skin material 3 toward the core material 4 side, the bending portion 7 and the latching portion 8 adjust the shape of the skin material 3 and adjust the shape of the skin material 3 and the core. It is advantageous to make the seal with the material 4 more complete.
If the skin material 3 is not deflected and has a slit S between the bent edge tip 3a and the core material 4 as shown in FIG. When the skin member 3 is pushed to the core member 4 side by the slide of the slide member 6 and pulled and joined, that is, when the state shown in FIG. In addition, a part of the skin material 3 becomes thin and it is easy to invite defective products.
Therefore, as shown in FIG. 2, it is preferable to bend a part of the skin material 3 in advance and to provide the latching portion 8 at the tip.
[0018]
Thus, in the present invention, the skin material 3 is arranged in one mold 1, the slide member 6 is slid to the extent that the skin material 3 is applied, the setting of the skin material 3 is completed on the mold 1, and the core material 4 is arranged. , And mold matching with the other mold 2 set. At this time, since the bending edge tip 3a of the skin material 3 is not yet in contact with the core material 4, the slide member 6 is slid again to the maximum, and the bending edge tip 3a is moved to the core material. Close to 4.
Therefore, it is preferable that the slide length of the slide member 6 is set in accordance with the shape of the bent edge portion 3a and the core material 4 in accordance with the form of the foam molded product, so that a slight margin is provided.
And if the bending edge front-end | tip part 3a of the said skin material 3 and the core material 4 contact | abut, it will fully seal by the press of the slide member 6, inject | pour polyurethane etc. which are foam materials, and perform foam molding. Do.
[0019]
In this way, in the present invention, the skin material edge is completely sealed, the effect on the product surface is minimized, the trim process is rationalized, and the molding time can be shortened.
[0020]
【The invention's effect】
In accordance with the present invention, a slide member is disposed so as to bring the front end of the bent edge of the skin material into contact with the core material, corresponding to the bent position of the outer edge of the mold in which the skin material is arranged as described above. In the mold matching prior to foam molding, after folding the tip of the bent edge portion of the skin material arranged in one mold by the slide member, and after matching with the other mold in which the core material is arranged, It is made to inject foamed material by making the tip of the folded edge of the skin material abut the core material and slide it while keeping the folded edge of the skin material bent. Since sliding with a member allows complete sealing with the sliding member and completely prevents leakage of foam material, the occurrence of burrs, etc., that have conventionally occurred due to liquid leakage is eliminated, and the trimming process is greatly simplified. Along with the table Even in the in-mold setting of the material and core material, the skin material can be flexed and placed by the slide member, so there is no need for labor as in the past, reducing the molding time and improving the appearance of the product Has a remarkable effect.
In particular, by forming a part of the flexure on the skin material and a hook-like hooking part for the slide member at the tip, the skin material can be set not only by the slide material but also by a further sealing effect. Can be increased.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional schematic view showing one embodiment of a foam molding method of the present invention.
FIG. 2 shows a preferred embodiment of the skin material in the foam molding method of the present invention, where (A) is a partial sectional view of the skin material before stretching, and (B) is a schematic partial sectional view of the skin material in the stretched state. is there.
FIGS. 3A and 3B show a slide mode of a comparative slide member, where FIG. 3A is a partial sectional view before sliding, and FIG. 3B is a partial sectional schematic view after sliding.
FIG. 4 is a cross-sectional view showing an example of a known seal structure.
FIG. 5 is a cross-sectional view showing another example of a known seal structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower mold 2 Upper mold 3 Skin material 4 Core material 5 Foam material 6 Slide member 7 Bending part 8 Latching part

Claims (2)

表皮材を配置した一方のモールドと、芯材を配置した他方のモールドを型合わせして、それら表皮材と芯材との間に発泡材料を注入し、表皮材と発泡層及び芯材が一体化された発泡成形品を成形する発泡成形方法において、前記一方のモールドに配置した表皮材の縁部を折り曲げ、該折り曲げ部をたわませた状態に維持して、該モールドに併設したスライド部材をスライドさせてその先端に前記表皮材の折曲げ縁部先端部を掛止させ、次いで他方のモールドを型合わせした後、上記スライド部材を、その先端に表皮材の折曲げ縁部先端部を掛止させたまま更にスライドさせて該先端部を芯材に当接させシールせしめて、表皮材と芯材の間に発泡材料を注入し発泡成形せしめることを特徴とする発泡成形方法。Match one mold with the skin material and the other mold with the core material, and inject the foam material between the skin material and the core material. The skin material, foam layer and core material are integrated. In a foam molding method for molding a molded foam molded article, the edge of the skin material disposed in the one mold is bent and the bent portion is maintained in a bent state so that the slide member is attached to the mold. And then the end of the folding edge of the skin material is hooked to the tip, and after the other mold has been matched, the slide member is attached to the tip of the bending edge of the skin material. A foam molding method characterized by further sliding and holding the tip part in contact with the core material for sealing, and injecting a foam material between the skin material and the core material to perform foam molding. 表皮材の折曲げ縁部にたわませ部と、その先端にスライド部材を掛止する引掛け状掛止部を予め形成しておく請求項１記載の発泡成形方法。2. The foam molding method according to claim 1, wherein a bent portion is formed at a bent edge portion of the skin material, and a hook-shaped hook portion for hooking the slide member at the tip thereof is formed in advance.
JP23146096A 1996-08-12 1996-08-12 Foam molding method Expired - Lifetime JP3662081B2 (en)

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JP23146096A JP3662081B2 (en) 1996-08-12 1996-08-12 Foam molding method

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JP23146096A JP3662081B2 (en) 1996-08-12 1996-08-12 Foam molding method

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JP3662081B2 true JP3662081B2 (en) 2005-06-22

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KR20040042676A (en) * 2002-11-15 2004-05-20 현대모비스 주식회사 structure of foaming metal mold for crash pad of automobile
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