JP2794321B2 - Injection molded body with turbulence prevention structure in hollow part - Google Patents
Injection molded body with turbulence prevention structure in hollow partInfo
- Publication number
- JP2794321B2 JP2794321B2 JP8826690A JP8826690A JP2794321B2 JP 2794321 B2 JP2794321 B2 JP 2794321B2 JP 8826690 A JP8826690 A JP 8826690A JP 8826690 A JP8826690 A JP 8826690A JP 2794321 B2 JP2794321 B2 JP 2794321B2
- Authority
- JP
- Japan
- Prior art keywords
- thick
- bent
- hollow
- prevention structure
- injection molded
- 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.)
- Expired - Lifetime
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)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、例えば自動車のラジエターグリルやホイー
ルカバー、更には事務機器や家庭用電気製品のハウジン
グ等として用いられる射出成形体に関するもので、特に
中空部を有する射出成形体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molded article used, for example, as a radiator grill or a wheel cover for an automobile, and further as a housing for office equipment or household electric appliances. The present invention relates to an injection molded article having a hollow portion.
［従来の技術］ 従来、軽量化やヒケ防止等を目的として、中空の射出
成形体とすることが行われている。[Prior Art] Conventionally, a hollow injection molded body has been used for the purpose of weight reduction and sink prevention.
上記射出成形体の中空部は、例えば溶融樹脂の射出後
又は射出と共に、金型内に加圧ガスを圧入することで形
成されている。The hollow portion of the injection molded body is formed by, for example, injecting a pressurized gas into a mold after or simultaneously with the injection of the molten resin.
［発明が解決しようとする課題］ ところで、上記中空部の形成において、加圧ガスは、
金型内の流動抵抗の小さい箇所、即ち成形体の厚肉部と
なる箇所に重点的に流入しやすいことから、厚肉部のみ
を中空構造とすることが可能である。[Problems to be Solved by the Invention] By the way, in the formation of the hollow portion, the pressurized gas is
Since it is easy to concentrate on the portion where the flow resistance is small in the mold, that is, the portion that becomes the thick portion of the molded body, it is possible to make only the thick portion a hollow structure.
しかしながら、上記加圧ガスは、必ず厚肉部に流入す
るとは限らず、場合によっては厚肉部からはみ出ること
が生じる。この加圧ガスのはみ出しは、厚肉部が直線状
である場合にも生じるが、特に厚肉部が大きく屈曲して
いる場合、圧入される加圧ガスは、この屈曲に沿って流
動しにくく、屈曲した厚肉部を外れて屈曲部の内側を短
絡してしまいやすくなる。この短絡が生じると、本来中
空構造とする必要のない比較的薄肉の箇所に中空部が形
成され、必要な強度が得られなくなる。However, the above-mentioned pressurized gas does not always flow into the thick portion, and may protrude from the thick portion in some cases. The protrusion of the pressurized gas also occurs when the thick portion is straight, but particularly when the thick portion is largely bent, the pressurized gas to be pressed hardly flows along the bend. In addition, it becomes easy to short-circuit the inside of the bent portion by detaching from the bent thick portion. When this short circuit occurs, a hollow portion is formed in a relatively thin portion that does not need to have a hollow structure, and the required strength cannot be obtained.
本発明は、このような問題点に鑑みてなされたもの
で、厚肉部に沿って確実に中空部を形成できるようにす
ることをその解決すべき課題とするものである。The present invention has been made in view of such a problem, and an object of the present invention is to reliably form a hollow portion along a thick portion.
［課題を解決するための手段］ 上記課題を解決するために本発明で講じられた手段を
説明すると、請求項第１項の発明においては、屈曲した
中空構造の厚肉部１の屈曲部内側付近に沿って溝状の流
動堰部２を設けるという手段を講じているものである
（第１図参照）。また、請求項第２項の発明において
は、厚肉部１の両側に沿って溝状の流動堰部２を設ける
という手段を講じているものである（第２図参照）。更
に、請求項第３項の発明においては、屈曲した中空構造
の厚肉部１の屈曲部を、更に肉厚が増大された誘導部３
とするという手段を講じているものである（第３図参
照）。[Means for Solving the Problem] Means taken in the present invention for solving the above problem will be described. In the invention of claim 1, the inside of the bent portion of the thick portion 1 having a bent hollow structure is described. A means is provided in which a groove-shaped flow dam 2 is provided along the vicinity (see FIG. 1). Further, in the invention of claim 2, means is provided for providing a groove-shaped flow weir 2 along both sides of the thick part 1 (see FIG. 2). Furthermore, in the third aspect of the present invention, the bent portion of the thick portion 1 having the bent hollow structure is replaced with the guiding portion 3 having a further increased thickness.
(See FIG. 3).
［作用］ 請求項第１項の発明における流動堰部２は、屈曲部の
内側の肉厚を薄くすることで、当該部分の流動抵抗を更
に増大させることで、圧入される加圧ガスの流路を、屈
曲した厚肉部１に沿った方向に向けさせる働きをなす。[Function] The flow weir 2 according to the first aspect of the present invention reduces the thickness of the inside of the bent portion to further increase the flow resistance of the portion, thereby allowing the flow of the pressurized gas to be press-fitted. It serves to direct the road in the direction along the bent thick part 1.
請求項第２項の発明における流動堰部２は、厚肉部１
の両側に設けられていることにより、圧入される加圧ガ
スの流路を、厚肉部１である両流動堰部２間に限定する
働きをなす。The flowing weir portion 2 according to the second aspect of the present invention has a thick wall portion 1.
Are provided on both sides of the flow damper, and serves to limit the flow path of the pressurized gas to be press-fitted between the two flow weir portions 2 which are the thick portions 1.
請求項第３項の発明における誘導部３は、厚肉部１の
流動抵抗を更に下げることで、圧入される加圧ガスの流
路を、屈曲した厚肉部１内に積極的に導き入れる働きを
なす。According to the third aspect of the present invention, the guide portion 3 further positively guides the flow path of the pressurized gas to be pressed into the bent thick portion 1 by further reducing the flow resistance of the thick portion 1. Work.
［実施例］ 第１図は請求項第１項の発明の一実施例を示すもの
で、本射出成形体は、ほぼ平面コ字形に屈曲されたリブ
状の厚肉部１を有するものとなっている。また、この厚
肉部１内は中空部４となっていると共に、肉厚部１の２
箇所の屈曲部の内側に沿って、溝状の流動堰部２が形成
されている。[Embodiment] FIG. 1 shows an embodiment of the first aspect of the present invention. The present injection molded article has a rib-shaped thick portion 1 which is bent in a substantially U-shape. ing. The inside of the thick portion 1 is a hollow portion 4 and the thick portion 1
A groove-shaped flow weir 2 is formed along the inside of the bent portion.
上記流動堰部２は、中空部４を厚肉部１内に確実に留
めることができるよう、できるだけ厚肉部１に接近させ
て形成しておくことが好ましい。この流動堰部２と厚肉
部１間の間隔は、10mm以内、できれば両者が接している
ことが好ましい。The flow weir 2 is preferably formed as close as possible to the thick portion 1 so that the hollow portion 4 can be securely retained in the thick portion 1. The space between the flowing weir 2 and the thick part 1 is preferably within 10 mm, and preferably both are in contact with each other.
流動堰部２は、少なくとも厚肉部１の屈曲部に沿った
範囲に設けられていれば足るが、できれば屈曲部の前後
にもある程度延在させておくことが好ましい。この延在
長さは、厚肉部１の屈曲状態にもよが、10〜200mm程度
が好ましい。It is sufficient that the flowing weir portion 2 is provided at least in a range along the bent portion of the thick portion 1. However, it is preferable that the flowing weir portion 2 extend to some extent before and after the bent portion if possible. The extension length is preferably about 10 to 200 mm, depending on the bent state of the thick part 1.
流動堰部２の幅と深さは、厚肉部１の屈曲状態や、厚
肉部１やその他の部分の厚さにもよるが、加圧ガスの流
路を確実に厚肉部１へ向けることができる流動抵抗を得
る上で、幅２〜5mm、深さは厚さの10〜90％であること
が好ましい。The width and depth of the flowing weir 2 depend on the bent state of the thick part 1 and the thickness of the thick part 1 and other parts, but the pressurized gas flow path to the thick part 1 is ensured. In order to obtain a flow resistance that can be directed, it is preferable that the width is 2 to 5 mm and the depth is 10 to 90% of the thickness.
第２図は請求項第２項の発明の一実施例を示すもの
で、厚肉部１は直線状で、その両側に第１図のものと同
様の流動堰部２が設けられている。FIG. 2 shows an embodiment of the second aspect of the present invention, in which a thick portion 1 is linear and a flow dam 2 similar to that of FIG. 1 is provided on both sides thereof.
このようにすると、比較的発生割合は少ないものの、
直線状の厚肉部１における加圧ガス流路のはみ出しを防
止することができる。In this way, although the occurrence rate is relatively small,
It is possible to prevent the pressurized gas flow path from protruding in the linear thick portion 1.
尚、第１図に示される屈曲部に沿って流動堰部２を設
ける場合においても、第２図に示されるものと同様に、
この屈曲部の両側に流動堰部２を設けることは一向に差
し支えない。In the case where the flow dam 2 is provided along the bent portion shown in FIG. 1, similarly to the case shown in FIG.
Providing the flow weirs 2 on both sides of this bent portion does not matter at all.
第３図は請求項第３項の発明の一実施例を示すもの
で、第１図で説明したものとほぼ同様であるが、第１図
の流動堰部２に代えて、厚肉部１の屈曲部が、更に肉厚
が増大された誘導部３となっている。FIG. 3 shows an embodiment of the invention according to claim 3, which is substantially the same as that described in FIG. 1, except that the flow weir 2 shown in FIG. Is a guiding portion 3 whose thickness is further increased.
誘導部３は、少なくとも厚肉部１の屈曲部の範囲に形
成すれば足るが、できれば屈曲部の前後にもある程度延
在させておくことが好ましい。この延在長さは、厚肉部
１の屈曲状態にもよるが、10〜100mm程度が好ましい。It is sufficient if the guide portion 3 is formed at least in the range of the bent portion of the thick portion 1, but it is preferable that the guide portion 3 extend to some extent before and after the bent portion if possible. The length of the extension depends on the bent state of the thick part 1, but is preferably about 10 to 100 mm.
誘導部３の肉厚は、厚肉部１の屈曲状態や、厚肉部１
やその他の部分の厚さにもよるが、加圧ガスの流路を確
実に誘導部３内へ導くことができる流動抵抗とする上
で、厚肉部１より1.5〜３倍の肉厚とすることが好まし
い。The thickness of the guiding portion 3 depends on the bent state of the thick portion 1 and the thickness of the thick portion 1.
In order to ensure that the flow path of the pressurized gas flows into the guiding portion 3, the thickness of the thick portion 1 should be 1.5 to 3 times as large as that of the thick portion 1, though it depends on the thickness of the other portions. Is preferred.
［発明の効果］ 本発明は、以上説明した通りのものであり、確実に厚
肉部１に沿って中空部４を形成でき、予定外のところへ
中空部４が形成されて、局部的な強度低下を生じること
もなく、安定した品質の射出成形体を得ることができる
ものである。[Effects of the Invention] The present invention is as described above, and the hollow portion 4 can be reliably formed along the thick portion 1, and the hollow portion 4 is formed at an unexpected place to provide a local portion. An injection-molded article of stable quality can be obtained without a decrease in strength.
第１図は請求項第１項の発明の一実施例を示すもので、
（ａ）は平面図、（ｂ）はそのＸ−Ｘ断面図、第２図は
請求項第２項の発明の一実施例を示すもので、（ａ）は
平面図、（ｂ）はそのＹ−Ｙ断面図、第３図は請求項第
３項の発明の一実施例を示すもので、（ａ）は平面図、
（ｂ）はそのＺ−Ｚ断面図である。 1:厚肉部、2:流動堰部、3:誘導部、4:中空部。FIG. 1 shows an embodiment of the invention of claim 1.
2 (a) is a plan view, FIG. 2 (b) is a sectional view taken along line XX, FIG. 2 shows an embodiment of the second aspect of the present invention, FIG. 2 (a) is a plan view, and FIG. FIG. 3 is a sectional view taken along the line Y-Y, FIG. 3 shows an embodiment of the invention according to claim 3, (a) is a plan view,
(B) is the ZZ sectional view. 1: thick part, 2: flowing weir part, 3: guide part, 4: hollow part.
フロントページの続き (56)参考文献 特開 平３−207617（ＪＰ，Ａ) 特開 昭63−268611（ＪＰ，Ａ) 特開 昭59−152831（ＪＰ，Ａ) 特開 平１−202413（ＪＰ，Ａ) 特開 平１−202412（ＪＰ，Ａ) 特開 昭58−81137（ＪＰ，Ａ) 実開 昭61−192750（ＪＰ，Ｕ) 実開 平３−11240（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/89 B29D 22/00 B29L 22:00Continuation of the front page (56) References JP-A-3-207617 (JP, A) JP-A-63-268611 (JP, A) JP-A-59-152831 (JP, A) JP-A-1-202413 (JP) JP-A-1-202412 (JP, A) JP-A-58-81137 (JP, A) JP-A-61-192750 (JP, U) JP-A-3-11240 (JP, U) (58) Field surveyed (Int.Cl. 6 , DB name) B29C 45/00-45/89 B29D 22/00 B29L 22:00
Claims (3)
の屈曲部内側付近に沿って溝状の流動堰部が設けられて
いることを特徴とする中空部乱れ防止構造付射出成形
体。1. A turbulence prevention structure having a hollow portion, comprising a thick wall portion having a bent hollow structure, and a flow weir portion having a groove shape provided near the inside of the bent portion of the thick wall portion. Injection molding.
沿って溝状の流動堰部が設けられていることを特徴とす
る中空部乱れ防止構造付射出成形体。2. An injection molded article having a hollow portion turbulence prevention structure, comprising a thick portion having a hollow structure, and a groove-shaped flow weir portion provided along both sides of the thick portion.
の屈曲部が、更に肉厚が増大された誘導部となっている
ことを特徴とする中空部乱れ防止構造付射出成形体。3. An injection with a hollow portion turbulence prevention structure, characterized in that it has a thick portion having a bent hollow structure, and the bent portion of the thick portion is a guiding portion having an increased thickness. Molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8826690A JP2794321B2 (en) | 1990-04-04 | 1990-04-04 | Injection molded body with turbulence prevention structure in hollow part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8826690A JP2794321B2 (en) | 1990-04-04 | 1990-04-04 | Injection molded body with turbulence prevention structure in hollow part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03286813A JPH03286813A (en) | 1991-12-17 |
| JP2794321B2 true JP2794321B2 (en) | 1998-09-03 |
Family
ID=13938089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8826690A Expired - Lifetime JP2794321B2 (en) | 1990-04-04 | 1990-04-04 | Injection molded body with turbulence prevention structure in hollow part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2794321B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9714807D0 (en) * | 1997-07-15 | 1997-09-17 | Gas Injection Ltd | Improvements in or relating to gas assisted injection moulding |
| JP4942704B2 (en) * | 2008-06-11 | 2012-05-30 | 株式会社ファルテック | Manufacturing method of synthetic resin molded products |
-
1990
- 1990-04-04 JP JP8826690A patent/JP2794321B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03286813A (en) | 1991-12-17 |
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