JPH1158413A - Synthetic resin hollow molded form and molding method thereof - Google Patents
Synthetic resin hollow molded form and molding method thereofInfo
- Publication number
- JPH1158413A JPH1158413A JP23036797A JP23036797A JPH1158413A JP H1158413 A JPH1158413 A JP H1158413A JP 23036797 A JP23036797 A JP 23036797A JP 23036797 A JP23036797 A JP 23036797A JP H1158413 A JPH1158413 A JP H1158413A
- Authority
- JP
- Japan
- Prior art keywords
- core
- synthetic resin
- molding
- resin material
- melting point
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、乗用車のエアサ
スペンションのチャンバー、吸気マニフォールド、オイ
ルリザーバタンク、エアダクトあるいは産業用空気ばね
の空気室、レゾネータ等の合成樹脂中空成形品及びその
成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin hollow molded article such as an air suspension chamber of a passenger car, an intake manifold, an oil reservoir tank, an air duct or an air chamber of an industrial air spring, a resonator, and a method of molding the same.
【０００２】[0002]
【従来の技術】従来のこの種の成形品やその製造方法と
しては、特開平８−１７４５６５号公報に記載のものが
知られている。これは、中子を成形する樹脂の融点Ｍ1
と中空成形品を成形する樹脂の融点Ｍ2 との関係をＭ1
＜Ｍ2 とし、射出成形金型内に中子をセットし、この中
子の周囲に形成されるキャビティに射出成形材料を射出
し、成形後に金型から中子及び射出成形品を取出して融
点Ｍ1 以上、融点Ｍ2 未満の温度で加熱しながら、成形
品内面の溶融中子の残存樹脂をエアや液体で圧力をかけ
て完全に除去するものである。2. Description of the Related Art As a conventional molded article of this type and a method for producing the same, the one described in Japanese Patent Application Laid-Open No. 8-174565 is known. This is the melting point M 1 of the resin forming the core.
M 1 the relationship between the melting point M 2 of the resin for molding a hollow molded article and
<And M 2, and set the core in the injection mold, the injection molding material is injected into the cavity formed around the core, taking out the core and injection-molded article from the mold after molding melting point M 1 or more, while heating at a temperature lower than the melting point M 2, is to completely remove under pressure the residual resin in the molten core of the molded article interior surface in air or liquid.
【０００３】[0003]
【発明が解決しようとする課題】従来は、中空成形品の
内面に中子の樹脂が残って内面が凹凸にならないよう
に、溶融させた中子の樹脂の完全排除を行なっていたの
で、そのための工程と時間を要していた。また、中子の
周囲のキャビティに射出成形材料を射出すると、射出時
の樹脂材料の熱により中子がわずかながら溶解するの
で、中子除去後の成形品内面に微小な凹凸が発生してい
た。Conventionally, the melted core resin has been completely removed so that the core resin does not remain on the inner surface of the hollow molded product and the inner surface does not become uneven. Process and time were required. Also, when the injection molding material is injected into the cavity around the core, the core is slightly melted by the heat of the resin material at the time of injection, so that minute irregularities are generated on the inner surface of the molded product after the core is removed. .
【０００４】そこで、この発明は、中空成形品の内面の
平滑性を確保し、工程を短くしてコストダウンも図った
合成樹脂中空成形品及びその成形方法を提供することを
目的とする。Accordingly, an object of the present invention is to provide a synthetic resin hollow molded article in which the smoothness of the inner surface of the hollow molded article is ensured, the process is shortened and the cost is reduced, and a molding method therefor.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
め、この発明は、合成樹脂材料で成形された中子を用い
て成形金型内に中子成形用合成樹脂材料よりも融点の高
い合成樹脂材料を射出成形した後に中子を溶融除去して
得られる合成樹脂中空成形品において、中子を所定量溶
融除去後に中空成形品の内面に中子成形用合成樹脂材料
の被膜が一様に残存形成されたものである。また、中空
部を成形するための中子を合成樹脂材料で成形しておく
工程と、この中子を成形金型内にセットして中子の周囲
にキャビティを形成する工程と、このキャビティに中子
成形用合成樹脂材料よりも融点の高い合成樹脂材料を射
出する工程と、射出成形後に中子及び射出成形品を取出
して射出成形品の融点未満、中子の融点以上で加熱して
中子を所定量溶融除去して成形品の中空内面に中子成形
用合成樹脂材料の被覆を残す工程とから成るものであ
る。In order to achieve the above-mentioned object, the present invention uses a core molded of a synthetic resin material and has a higher melting point than a synthetic resin material for molding a core in a molding die. In a synthetic resin hollow molded product obtained by melting and removing the core after injection molding of the synthetic resin material, the coating of the synthetic resin material for core molding is uniform on the inner surface of the hollow molded product after the core is melted and removed by a predetermined amount. Is formed. Also, a step of molding a core for molding the hollow portion with a synthetic resin material, a step of setting the core in a molding die and forming a cavity around the core, A step of injecting a synthetic resin material having a melting point higher than that of the core molding synthetic resin material, and taking out the core and the injection molded article after the injection molding, and heating at a temperature lower than the melting point of the injection molded article or higher than the melting point of the core. And melting the core in a predetermined amount to leave a coating of the core molding synthetic resin material on the hollow inner surface of the molded article.
【０００６】[0006]
【発明の実施の形態】以下に、この発明の好適な実施例
を図面を参照にして説明する。Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００７】図１に示す合成樹脂中空成形品は、エアサ
スペンションのチャンバー或いはレゾネーターとして使
用できるものであり、中空成形品１の中空内面には後述
する中子成形用合成樹脂材料の被膜２が一様に残存形成
されている。図１において符号３は中空部を示す。The synthetic resin hollow molded product shown in FIG. 1 can be used as a chamber or a resonator of an air suspension, and a hollow molded product 1 has a coating 2 made of a synthetic resin material for core molding to be described later. It is formed as follows. In FIG. 1, reference numeral 3 indicates a hollow portion.
【０００８】図１に示すような中空成形品１は、中空部
３を形成するための中子４を合成樹脂材料で成形し、こ
の中子４を成形金型１０内にセットして中子４の周囲に
キャビティ１１を形成する。このキャビティ１１に射出
口１２から中子成形用合成樹脂材料よりも融点の高い合
成樹脂材料を射出する。射出成形後に中子４を内蔵した
ままの射出成形品を取出す。この取出したものを射出成
形品の融点未満、中子４の融点以上で加熱して中子４を
所定量溶融除去する（図３参照）。この中子４の加熱溶
融は、加熱炉内で行なわれ、中子４の溶融した樹脂を自
重で滴下させ、ある程度の溶融除去が行なわれた状態、
すなわち図４に示す状態になったとき、ガス又は液体を
中子４の融点以下の温度で一定圧力で噴射する。このよ
うな圧力流体の噴射により溶融中子の残存樹脂を中空成
形品１の内面側に圧して一様な被膜２が成形品１の内面
に残存する。In a hollow molded article 1 as shown in FIG. 1, a core 4 for forming a hollow portion 3 is molded from a synthetic resin material, and the core 4 is set in a molding die 10 to form a core. A cavity 11 is formed around 4. A synthetic resin material having a higher melting point than the synthetic resin material for core molding is injected from the injection port 12 into the cavity 11. After the injection molding, an injection molded product having the core 4 built therein is taken out. The removed material is heated at a temperature lower than the melting point of the injection molded product and higher than the melting point of the core 4 to melt and remove a predetermined amount of the core 4 (see FIG. 3). The heating and melting of the core 4 is performed in a heating furnace, the molten resin of the core 4 is dropped by its own weight, and a certain amount of melting and removal is performed.
That is, when the state shown in FIG. 4 is reached, the gas or liquid is injected at a temperature lower than the melting point of the core 4 at a constant pressure. By the injection of the pressure fluid, the resin remaining in the molten core is pressed against the inner surface of the hollow molded article 1, and a uniform coating 2 remains on the inner surface of the molded article 1.
【０００９】流体噴射の代りに、例えば中空部３の中に
ホースを入れて流体を流すことで残存樹脂に平滑面を形
成することもできる。中空部３内へ噴射あるいは流す流
体の温度は、中子４の融点以下としたが、融点以上の温
度で中子４を溶融させながら噴射あるいは流し込むこと
もできる。In place of the fluid injection, a smooth surface can be formed on the remaining resin by, for example, putting a hose into the hollow portion 3 and flowing the fluid. Although the temperature of the fluid jetted or flown into the hollow portion 3 is set to be equal to or lower than the melting point of the core 4, the fluid may be jetted or poured while melting the core 4 at a temperature higher than the melting point.
【００１０】成形品１を形成する合成樹脂材料として
は、ナイロンが好適に使用でき、中子４を形成する合成
樹脂材料としてはポリエチレンやポリアセタールが好適
に使用できる。As the synthetic resin material forming the molded article 1, nylon can be preferably used, and as the synthetic resin material forming the core 4, polyethylene or polyacetal can be preferably used.
【００１１】図５は樹脂製の吸気マニフォールドを示
し、中空部３の内面には中子成形用樹脂材料の被膜２が
一様に残存している。FIG. 5 shows an intake manifold made of resin, in which a coating 2 of a core molding resin material remains uniformly on the inner surface of a hollow portion 3.
【００１２】このように成形品１の内面に被膜２を一様
に残存形成しておくことにより、被膜２に使用する材料
を選択することにより一定の重量を確保したり、密閉性
を良好にしたり或いは耐熱性を確保することもできる。By uniformly forming the coating 2 on the inner surface of the molded article 1 as described above, a certain weight can be ensured by selecting a material to be used for the coating 2, and the sealing property can be improved. Alternatively, heat resistance can be ensured.
【００１３】[0013]
【発明の効果】以上説明したように、この発明によれ
ば、合成樹脂材料で成形された中子を用いて成形金型内
に中子成形用合成樹脂材料よりも融点の高い合成樹脂材
料を射出成形した後に中子を溶融除去して得られる合成
樹脂中空成形品において、中子を所定量溶融除去後に中
空成形品の内面に中子成形用合成樹脂材料の被膜が一様
に残存形成されているので、内面がデコボコにならず平
滑性を確保できる。また、中空部を成形するための中子
を合成樹脂材料で成形しておく工程と、この中子を成形
金型内にセットして中子の周囲にキャビティを形成する
工程と、このキャビティに中子成形用合成樹脂材料より
も融点の高い合成樹脂材料を射出する工程と、射出成形
後に中子及び射出成形品を取出して射出成形品の融点未
満、中子の融点以上で加熱して中子を所定量溶融除去し
て成形品の中空内面に中子成形用合成樹脂材料の被覆を
残す工程とから成る成形方法によれば、中子の樹脂を完
全に排除する工程が不要となり、しかも成形品の内面の
平滑性も確保でき、安価に中空成形品を成形することが
できる。また中子溶融除去後に成形品の中空内面に圧力
流体を噴射して中子成形用合成樹脂材料の被膜を残すよ
うにしたものでは、被膜の平滑性がより一層高まる。As described above, according to the present invention, a synthetic resin material having a higher melting point than a synthetic resin material for molding a core is formed in a molding die by using a core molded of a synthetic resin material. In a synthetic resin hollow molded product obtained by melting and removing the core after injection molding, a coating of the synthetic resin material for core molding is uniformly formed on the inner surface of the hollow molded product after a predetermined amount of the core is melted and removed. As a result, the inner surface does not become uneven and smoothness can be ensured. Also, a step of molding a core for molding the hollow portion with a synthetic resin material, a step of setting the core in a molding die and forming a cavity around the core, A step of injecting a synthetic resin material having a melting point higher than that of the core molding synthetic resin material, and taking out the core and the injection molded article after the injection molding, and heating at a temperature lower than the melting point of the injection molded article or higher than the melting point of the core. A step of leaving a coating of the core-forming synthetic resin material on the hollow inner surface of the molded article by melting and removing a predetermined amount of the core, a step of completely removing the resin of the core becomes unnecessary, and The smoothness of the inner surface of the molded product can be ensured, and the hollow molded product can be molded at low cost. Further, in the case where the pressure fluid is jetted to the hollow inner surface of the molded article after the core is melted and removed to leave a film of the synthetic resin material for core molding, the smoothness of the film is further improved.
【図１】この発明の好適な実施例を示す断面図。FIG. 1 is a sectional view showing a preferred embodiment of the present invention.
【図２】中子を金型にセットした状態の断面図。FIG. 2 is a sectional view of a state in which a core is set in a mold.
【図３】射出成形後に中子を溶融させる途中の断面図。FIG. 3 is a cross-sectional view in the process of melting a core after injection molding.
【図４】中子溶融状態のある時期に圧力流体を噴射する
状態を示す断面図。FIG. 4 is a cross-sectional view showing a state in which a pressure fluid is injected at a certain time in a core melting state.
【図５】吸気マニフォールドに適用した例を示す断面
図。FIG. 5 is a cross-sectional view showing an example applied to an intake manifold.
１ 中空成形品 ２ 被膜 ３ 中空部 ４ 中子 １０ 射出成形金型 １１ キャビティ DESCRIPTION OF SYMBOLS 1 Hollow molded product 2 Coating 3 Hollow part 4 Core 10 Injection mold 11 Cavity
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 31:30 Continued on the front page (51) Int.Cl. 6 Identification code FI B29L 31:30
Claims (3)
成形金型内に中子成形用合成樹脂材料よりも融点の高い
合成樹脂材料を射出成形した後に中子を溶融除去して得
られる合成樹脂中空成形品において、 中子を所定量溶融除去後に中空成形品の内面に中子成形
用合成樹脂材料の被膜が一様に残存形成されたことを特
徴とする合成樹脂中空成形品。An injection molding method of a synthetic resin material having a melting point higher than that of a synthetic resin material for molding a core in a molding die using a core molded of the synthetic resin material, followed by melting and removing the core. A synthetic resin hollow molded article, wherein a coating of a synthetic resin material for core molding is uniformly formed on the inner surface of the hollow molded article after a predetermined amount of the core is melted and removed.
材料で成形しておく工程と、 この中子を成形金型内にセットして中子の周囲にキャビ
ティを形成する工程と、 このキャビティに中子成形用合成樹脂材料よりも融点の
高い合成樹脂材料を射出する工程と、 射出成形後に中子及び射出成形品を取出して射出成形品
の融点未満、中子の融点以上で加熱して中子を所定量溶
融除去して成形品の中空内面に中子成形用合成樹脂材料
の被覆を残す工程とから成る合成樹脂中空成形品の成形
方法。2. A step of molding a core for forming a hollow portion with a synthetic resin material, a step of setting the core in a molding die and forming a cavity around the core. A step of injecting a synthetic resin material having a melting point higher than that of the core molding synthetic resin material into the cavity; removing the core and the injection molded article after the injection molding; Melting the core in a predetermined amount to leave a coating of the synthetic resin material for core molding on the hollow inner surface of the molded article.
に圧力流体を噴射して中子成形用合成樹脂材料の被覆を
残すことを特徴とする請求項２に記載の合成樹脂中空成
形品の成形方法。3. The synthetic resin hollow molded article according to claim 2, wherein after the core is melted and removed, a pressurized fluid is injected into the hollow inner surface of the molded article to leave a coating of the synthetic resin material for core molding. Molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23036797A JPH1158413A (en) | 1997-08-12 | 1997-08-12 | Synthetic resin hollow molded form and molding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23036797A JPH1158413A (en) | 1997-08-12 | 1997-08-12 | Synthetic resin hollow molded form and molding method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1158413A true JPH1158413A (en) | 1999-03-02 |
Family
ID=16906754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23036797A Pending JPH1158413A (en) | 1997-08-12 | 1997-08-12 | Synthetic resin hollow molded form and molding method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1158413A (en) |
-
1997
- 1997-08-12 JP JP23036797A patent/JPH1158413A/en active Pending
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