JP2002018884A - Gas injection molded article - Google Patents
Gas injection molded articleInfo
- Publication number
- JP2002018884A JP2002018884A JP2000203134A JP2000203134A JP2002018884A JP 2002018884 A JP2002018884 A JP 2002018884A JP 2000203134 A JP2000203134 A JP 2000203134A JP 2000203134 A JP2000203134 A JP 2000203134A JP 2002018884 A JP2002018884 A JP 2002018884A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- injection molded
- thick
- gas injection
- channel
- 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
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、溶融樹脂の内部に
ガスを注入して形成されたチャンネル部を有するガスイ
ンジェクション成形品に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas injection molded article having a channel formed by injecting a gas into a molten resin.
【０００２】[0002]
【従来の技術】ガスインジェクション成形品は、金型内
の主キャビティに溶融樹脂を充填した後、キャビティ内
に、加圧窒素ガス等の不活性ガスを注入して形成され
る。充填された溶融樹脂内には、ガス圧によりガスの流
路が形成され、そのガス流路内のガスによって押圧され
た溶融樹脂が金型の内面に向かって押圧されるため、均
一な厚さの薄肉中空成形品が形成される。2. Description of the Related Art A gas injection molded product is formed by filling a main cavity in a mold with a molten resin and then injecting an inert gas such as pressurized nitrogen gas into the cavity. In the filled molten resin, a gas flow path is formed by gas pressure, and the molten resin pressed by the gas in the gas flow path is pressed toward the inner surface of the mold, so that a uniform thickness is obtained. Is formed.
【０００３】従来のガスインジェクション成形品の例を
図５及び図６に示す。FIGS. 5 and 6 show examples of a conventional gas injection molded product.
【０００４】図５に示したガスインジェクション成形品
５１は、その表面に厚肉のチャンネル部５２に沿ってリ
ブ５３が形成されている。チャンネル部５２の端末部５
４には、チャンネル部５２の肉厚が徐々に薄くなる徐辺
部５５が形成されている。チャンネル部５２の内方に
は、徐辺部５５の手前までガス中空部５６が形成されて
いる。The gas injection molded product 51 shown in FIG. 5 has a rib 53 formed on a surface thereof along a thick channel portion 52. Terminal unit 5 of channel unit 52
In FIG. 4, a slope portion 55 in which the thickness of the channel portion 52 is gradually reduced is formed. A gas hollow portion 56 is formed inside the channel portion 52 up to a position short of the slow side portion 55.
【０００５】図６に示したガスインジェクション成形品
５７は、チャンネル部５８がその端末部５９まで厚肉に
形成されており、その端末部５９の近傍までリブ６１が
形成されている。ガス中空部６２は、チャンネル部５８
の内方で、端末部５９から所定間隔を隔てた位置まで延
出している。The gas injection molded article 57 shown in FIG. 6 has a channel portion 58 formed thick up to a terminal portion 59 thereof, and a rib 61 formed near the terminal portion 59. The gas hollow portion 62 has a channel portion 58.
And extends from the terminal portion 59 to a position at a predetermined interval.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上述し
た従来のガスインジェクション成形品５１では、チャン
ネル部５２の端末部５４が徐々に薄くなっているので、
ガス中空部５６が徐辺部５５の手前で止まり、徐辺部５
５の反対側の面で、ヒケ６３が発生して、溶融樹脂の表
面が引っ張られて窪んでしまうと共に、端末部５４の強
度が不足してしまうといった問題があった。However, in the above-described conventional gas injection molded product 51, the terminal portion 54 of the channel portion 52 is gradually thinned.
The gas hollow portion 56 stops before the slow side portion 55, and the slow side portion 5
On the surface on the side opposite to 5, there is a problem that sink marks 63 occur, the surface of the molten resin is pulled and depressed, and the strength of the terminal portion 54 is insufficient.
【０００７】また、ガスインジェクション成形品５７で
は、チャンネル部５８の端末部５９まで厚肉であるた
め、必要な強度を有してはいるが、極端な肉厚の変化に
より、ガス中空部６２がチャンネル部５８の端末部５９
の手前で止まってしまい、その先端部分（図中右側）
に、ヒケ６４が発生して、溶融樹脂の表面が引っ張られ
て窪んでしまうといった問題があった。The gas injection molded article 57 has a necessary strength because it is thick up to the end portion 59 of the channel portion 58, but the gas hollow portion 62 is formed due to an extreme change in thickness. Terminal section 59 of channel section 58
Stops in front of it, and its tip (right side in the figure)
In addition, there is a problem that sink marks 64 are generated and the surface of the molten resin is pulled and depressed.
【０００８】そこで、本発明は上記問題を解決すべく案
出されたものであり、その目的は、ヒケが発生せずに、
チャンネル部の端末部まで十分な強度を有するガスイン
ジェクション成形品を提供することにある。Therefore, the present invention has been devised to solve the above-mentioned problems, and its object is to eliminate the occurrence of sink marks,
It is an object of the present invention to provide a gas injection molded product having sufficient strength up to a terminal portion of a channel portion.
【０００９】[0009]
【課題を解決するための手段】前記課題を解決すべく、
本発明は、製品の表面を構成する板状部の内部にガスを
注入して形成された厚肉のチャンネル部の外周に溝を形
成して肉盗み形状とすると共に、上記チャンネル部の端
末部に上記板状部よりも肉厚が厚い厚肉部を形成したも
のである。In order to solve the above-mentioned problems,
According to the present invention, a groove is formed on the outer periphery of a thick channel portion formed by injecting a gas into a plate-like portion constituting a surface of a product to form a stealthy shape, and a terminal portion of the channel portion is formed. And a thick portion having a greater thickness than the plate portion.
【００１０】上記構成によれば、チャンネル部の幅方向
両脇を薄肉とし、チャンネル部の端末部を厚肉としたこ
とによって、ガスをチャンネル部の端末部よりも先端側
に流すことができるので、ヒケが発生しないと共に、リ
ブをチャンネル部の端末部まで形成することができ、十
分な強度を得ることができる。According to the above configuration, the gas can be made to flow more distally than the terminal portion of the channel portion by making the both sides in the width direction of the channel portion thin and making the terminal portion of the channel portion thick. No sink marks occur, and the ribs can be formed up to the end of the channel portion, so that sufficient strength can be obtained.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に従って説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１２】図１は本発明に係るガスインジェクション
成形品の好適な実施の形態を示した平面図、図２は図１
のＡ−Ａ線断面図、図３は図１のＢ−Ｂ線断面図、図４
は本発明に係るガスインジェクション成形品の要部拡大
断面図である。FIG. 1 is a plan view showing a preferred embodiment of a gas injection molded product according to the present invention, and FIG.
3 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG.
1 is an enlarged sectional view of a main part of a gas injection molded product according to the present invention.
【００１３】なお、ガスインジェクション成形品として
は、自動車のバンパーやダッシュボード等の内外装品等
の大型面状製品が挙げられるが、本実施の形態において
は、板状部の裏面にリブが形成されて、補強されたイン
ストパネルを例に挙げて説明する。As the gas injection molded product, there is a large planar product such as an interior / exterior product such as a bumper or a dashboard of an automobile. In the present embodiment, a rib is formed on the back surface of the plate portion. The reinforced instrument panel will be described as an example.
【００１４】まず、係るガスインジェクション成形品の
構成について説明する。First, the configuration of such a gas injection molded product will be described.
【００１５】図示するように、ガスインジェクション成
形品１であるインストパネルは、製品の表面を構成する
板状部２の裏面（図１乃至図４では、上側に示してい
る）に補強部材であるリブ３が形成されている。As shown in the figure, an instrument panel, which is a gas injection molded product 1, is a reinforcing member on the back surface (shown on the upper side in FIGS. 1 to 4) of a plate-like portion 2 constituting the surface of the product. Ribs 3 are formed.
【００１６】リブ３は、厚肉のチャンネル部４に沿って
立設されており、チャンネル部４の端末部５まで延出し
ている。チャンネル部４は、板状部２の略中心に位置
し、断面が略半円状に形成されている。The rib 3 is erected along the thick channel portion 4 and extends to a terminal portion 5 of the channel portion 4. The channel portion 4 is located substantially at the center of the plate portion 2 and has a substantially semicircular cross section.
【００１７】チャンネル部４の内方には、成形時のガス
流路６であるガス中空部７が形成されている。Inside the channel portion 4, a gas hollow portion 7 which is a gas flow path 6 at the time of molding is formed.
【００１８】ところで、本発明は、厚肉のチャンネル部
４の外周に溝８を形成して肉盗み形状とすると共に、チ
ャンネル部４の端末部５に板状部２よりも肉厚が厚い厚
肉部９を形成したことを特徴とする。According to the present invention, the groove 8 is formed on the outer periphery of the thick channel portion 4 to form a stealth shape, and the terminal portion 5 of the channel portion 4 is thicker than the plate portion 2. It is characterized in that a meat portion 9 is formed.
【００１９】溝８は、チャンネル部４の幅方向両側から
端末部５に渡って、板状部２の表面を凹まして形成され
ており、その幅は例えば２ｍｍ程度に設定されている。The groove 8 is formed by recessing the surface of the plate-shaped portion 2 from both sides in the width direction of the channel portion 4 to the terminal portion 5, and its width is set to, for example, about 2 mm.
【００２０】厚肉部９は、チャンネル部４の端末部５の
リブ３の延長線上に位置し、溝８を埋めるように形成さ
れている。厚肉部９は、その幅がリブ３と同等の例えば
３ｍｍ程度であり、長さ（図中左右方向）Ｌ1 が溝８の
幅と同等の２ｍｍであり、厚さがチャンネル部４より薄
く、且つ板状部２より厚く、その厚さの差Ｌ2 が例えば
１ｍｍ程度となっており、チャンネル部４から厚肉部
９、板状部２へと向かうにつれて、その肉厚が徐々に薄
くなるように形成されている。The thick part 9 is located on an extension of the rib 3 of the terminal part 5 of the channel part 4 and is formed so as to fill the groove 8. The thick portion 9 has a width, for example, about 3 mm equivalent to the rib 3, a length (left-right direction in the drawing) L 1 is 2 mm equivalent to the width of the groove 8, and a thickness smaller than that of the channel portion 4. and thicker than the plate portion 2, has a thickness thereof difference L 2 is for example 1mm approximately, thick wall portion 9 from the channel portion 4, as toward the plate portion 2, its thickness gradually thinned It is formed so that it becomes.
【００２１】次に、ガスインジェクション成形品１の成
形工程を説明しながら、上記構成によるガスインジェク
ション成形品１の作用を説明する。Next, the operation of the gas injection molded article 1 having the above-described configuration will be described while explaining the molding process of the gas injection molded article 1.
【００２２】まず、金型１１内の主キャビティ１２に溶
融樹脂１４を充填する。その後、キャビティ１２内に、
加圧窒素ガス等の不活性ガスを注入して、溶融樹脂１４
内にガス圧によりガスの流路６を形成し、そのガス流路
６内のガスによって溶融樹脂１４を金型１１の内面に向
かって押圧して、リブ３及びチャンネル部４を形成す
る。なお、図示していないが、ガスは、金型１１に形成
されたガス注入孔より注入する。First, a molten resin 14 is filled in a main cavity 12 in a mold 11. Then, in the cavity 12,
An inert gas such as a pressurized nitrogen gas is injected to the molten resin 14.
A gas flow path 6 is formed therein by gas pressure, and the gas in the gas flow path 6 presses the molten resin 14 toward the inner surface of the mold 11 to form the rib 3 and the channel portion 4. Although not shown, gas is injected from a gas injection hole formed in the mold 11.
【００２３】このとき、係るガスインジェクション成形
品１の厚肉のチャンネル部４の外周に溝８を形成して肉
盗み形状とすると共に、チャンネル部４の端末部５に厚
肉部９を形成したことによって、ガスは、厚肉部９へ流
れて、その先端の板状部２まで流れていく。At this time, a groove 8 was formed on the outer periphery of the thick channel portion 4 of the gas injection molded product 1 to form a stealth shape, and a thick portion 9 was formed at the terminal portion 5 of the channel portion 4. As a result, the gas flows to the thick portion 9 and to the plate-shaped portion 2 at the tip thereof.
【００２４】これは、ガスインジェクション工法におい
ては、厚肉部へガスが流れるといった特異性を利用した
ためである。すなわち、ガスは、チャンネル部４の幅方
向両側が肉盗み形状となっているため、チャンネル部４
の側方には流れず、厚肉のチャンネル部４の長手方向に
沿って端末部５側へ流れる。さらに、端末部５では、チ
ャンネル部４から厚肉部９、板状部２へと向かって肉厚
が徐々に薄くなっており、極端な肉厚の変化がないの
で、ガスは、板状部２まで流れる。[0024] This is because the gas injection method utilizes the uniqueness of flowing gas to a thick portion. That is, since the gas has a stealth shape on both sides in the width direction of the channel portion 4, the gas
Does not flow to the side, but flows to the terminal portion 5 side along the longitudinal direction of the thick channel portion 4. Further, in the terminal portion 5, the thickness gradually decreases from the channel portion 4 to the thick portion 9 and the plate portion 2, and there is no extreme change in the thickness. Flows up to 2.
【００２５】このように、板状部２までガスが流れるの
で、ガス流路６の先端側（図中右側）は、薄肉となり、
ヒケの発生を防止することができる。As described above, since the gas flows to the plate-like portion 2, the tip side (the right side in the figure) of the gas flow path 6 becomes thin,
The occurrence of sink marks can be prevented.
【００２６】また、チャンネル部４をその端末部５まで
厚肉にすることができるので、十分な強度を得ることが
できる。Further, since the channel portion 4 can be made thick up to the terminal portion 5, sufficient strength can be obtained.
【００２７】なお、本実施の形態においては、インスト
パネルを例に挙げて説明したが、本発明は、自動車の内
外装品に限られることなく、家電等他の製品にも適用で
きるのは勿論である。Although the present embodiment has been described by taking an instrument panel as an example, the present invention is not limited to the interior and exterior parts of an automobile, but may be applied to other products such as home appliances. It is.
【００２８】[0028]
【発明の効果】以上要するに本発明によれば、厚肉のチ
ャンネル部の外周に溝を形成して肉盗み形状とすると共
に、チャンネル部の端末部に厚肉部を形成したことによ
って、ガスは、厚肉部へ流れて、その先端の板状部まで
流れ、ヒケを防止することができると共に、チャンネル
部をその端末部まで厚肉にすることができるので、十分
な強度を得ることができるという優れた効果を発揮す
る。In summary, according to the present invention, gas is formed by forming a groove on the outer periphery of a thick channel portion to form a stealth shape and forming a thick portion at a terminal portion of the channel portion. , Flows to the thick portion, flows to the plate-shaped portion at the tip thereof, and prevents sink marks, and the channel portion can be made thick to its terminal portion, so that sufficient strength can be obtained. It has an excellent effect.
【図１】本発明に係るガスインジェクション成形品の好
適な実施の形態を示した平面図である。FIG. 1 is a plan view showing a preferred embodiment of a gas injection molded product according to the present invention.
【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図１のＢ−Ｂ線断面図である。FIG. 3 is a sectional view taken along line BB of FIG. 1;
【図４】本発明に係るガスインジェクション成形品の要
部拡大断面図である。FIG. 4 is an enlarged sectional view of a main part of a gas injection molded product according to the present invention.
【図５】従来のガスインジェクション成形品を示した
（ａ）は平面図、（ｂ）はＣ−Ｃ線断面図、（ｃ）はＤ
−Ｄ線断面図である。5A and 5B show a conventional gas injection molded product, FIG. 5A is a plan view, FIG. 5B is a sectional view taken along line CC, and FIG.
FIG. 4 is a sectional view taken along line D.
【図６】従来のガスインジェクション成形品を示した
（ａ）は平面図、（ｂ）はＥ−Ｅ線断面図、（ｃ）はＦ
−Ｆ線断面図である。6A and 6B show a conventional gas injection molded product, FIG. 6A is a plan view, FIG. 6B is a sectional view taken along line EE, and FIG.
It is a sectional view taken on line -F.
１ ガスインジェクション成形品 ２ 板状部 ４ チャンネル部 ５ 端末部 ８ 溝 ９ 厚肉部 DESCRIPTION OF SYMBOLS 1 Gas injection molded product 2 Plate part 4 Channel part 5 Terminal part 8 Groove 9 Thick part
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F202 AG07 AH25 AH42 AM34 CA11 CB01 CK11 4F206 AG07 AH25 AH42 AM34 JA05 JN27 JQ81 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AG07 AH25 AH42 AM34 CA11 CB01 CK11 4F206 AG07 AH25 AH42 AM34 JA05 JN27 JQ81
Claims (1)
スを注入して形成された厚肉のチャンネル部の外周に溝
を形成して肉盗み形状とすると共に、上記チャンネル部
の端末部に上記板状部よりも肉厚が厚い厚肉部を形成し
たことを特徴とするガスインジェクション成形品。1. A groove is formed on the outer periphery of a thick channel formed by injecting a gas into a plate-like portion constituting a surface of a product to form a stealth shape, and a terminal of the channel is formed. A gas injection molded product characterized in that a thick portion having a greater thickness than the plate portion is formed in the portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203134A JP2002018884A (en) | 2000-06-30 | 2000-06-30 | Gas injection molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203134A JP2002018884A (en) | 2000-06-30 | 2000-06-30 | Gas injection molded article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002018884A true JP2002018884A (en) | 2002-01-22 |
Family
ID=18700572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000203134A Pending JP2002018884A (en) | 2000-06-30 | 2000-06-30 | Gas injection molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002018884A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010173727A (en) * | 2009-01-30 | 2010-08-12 | Dic Corp | Synthetic resin pallet |
-
2000
- 2000-06-30 JP JP2000203134A patent/JP2002018884A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010173727A (en) * | 2009-01-30 | 2010-08-12 | Dic Corp | Synthetic resin pallet |
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