JPH0767733B2 - Molding method for hollow resin moldings - Google Patents
Molding method for hollow resin moldingsInfo
- Publication number
- JPH0767733B2 JPH0767733B2 JP61249862A JP24986286A JPH0767733B2 JP H0767733 B2 JPH0767733 B2 JP H0767733B2 JP 61249862 A JP61249862 A JP 61249862A JP 24986286 A JP24986286 A JP 24986286A JP H0767733 B2 JPH0767733 B2 JP H0767733B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- hollow resin
- flange portion
- molding method
- intake manifold
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming 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、端部にフランジ部をもつ中空状の樹脂成形品
をブロー成形法によつて成形する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a hollow resin molded product having a flange portion at its end by a blow molding method.
従来の技術 例えば第３図に示すような内燃機関のインテークマニホ
ールドＭは軽量化のために主としてアルミ合金で鋳造さ
れているが、アルミ鋳造法は製造コストが高く、また軽
合金であるとはいえその製品重量はかなり大きなものと
なつている。例えばＶ型６気筒エンジンのインテークマ
ニホールドでは約5Kgにも達する。2. Description of the Related Art For example, an intake manifold M of an internal combustion engine as shown in FIG. 3 is mainly cast from an aluminum alloy in order to reduce its weight. However, the aluminum casting method has a high manufacturing cost and is a light alloy. The product weight is quite large. For example, the intake manifold of a V6 engine can reach about 5 kg.
このようなことから、インテークマニホールドの材料を
樹脂におきかえることは単なる製造コストの低減や製品
重量の低減のみならず、エンジン側マウント強度や振動
騒音の低減等の二次的効果が大きく、早期の実用化が望
まれており、既に一部においてはいわゆる合金中子法を
製法とする樹脂製インテークマニホールドが発表されて
いる。For this reason, replacing the intake manifold material with resin not only reduces manufacturing costs and product weight, but also has secondary effects such as engine-side mount strength and vibration noise reduction. Practical application is desired, and in part, a resin intake manifold manufactured by the so-called alloy core method has already been announced.
上記の合金中子法は公知のアルミ鋳造法を踏襲したもの
で、中子材質を砂から低融点合金中子とした点に改良点
が認められるものの、本質的には射出成形法の応用にす
ぎない。すなわち、インテークマニホールドを製造する
に際し、低融点合金中子を用いて射出成形を行なつたの
ちに中子を融解排出するという工程をとるため、公知の
アルミ鋳造法と比べて工程的なメリツトが得られないば
かりでなく、低融点合金にはビスマス等の高価な材料を
必要とするために材料コストの低減が望めない。The alloy core method described above follows the well-known aluminum casting method, and although improvements are recognized in that the core material is a low melting point alloy core from sand, it is essentially applied to the injection molding method. Only. That is, when the intake manifold is manufactured, since a step of melting and discharging the core after performing injection molding using a low melting point alloy core, there is a process merits as compared with the known aluminum casting method. Not only can it not be obtained, but an expensive material such as bismuth is required for the low-melting-point alloy, so reduction in material cost cannot be expected.
一方、中子を用いない中空部品の製造法としてはブロー
成形法が広く知られているが、ブロー成形法によりイン
テークマニホールドを製造するためには解決しなければ
ならない多くの問題があり、その一つにフランジ部分の
製造方法が挙げられる。On the other hand, although a blow molding method is widely known as a method for manufacturing a hollow part that does not use a core, there are many problems that must be solved in order to manufacture an intake manifold by the blow molding method. One example is a method of manufacturing the flange portion.
すなわち、インテークマニホールドＭのフランジ部Ｆ
（第３図参照）は比較的厚肉でなければならず、そのた
め一般的にはブロー成形とは別に、例えば射出成形によ
つてフランジ部を成形したのちに両者を接合することが
考えられる。しかしながら、接合に伴う工程の増加や製
造コストの上昇のみならず時として内周面の平滑さが害
され、インテークマニホールドの空気流入抵抗が増大す
るという問題がある。That is, the flange portion F of the intake manifold M
(See FIG. 3) must be relatively thick, so it is generally conceivable to form the flange part by injection molding, for example, separately from blow molding, and then to join the two. However, there is a problem that the smoothness of the inner peripheral surface is sometimes impaired and the air inflow resistance of the intake manifold increases as well as an increase in the number of steps involved in joining and an increase in manufacturing cost.
問題点を解決するための手段 本発明は上記のようなフランジ部の成形に主眼をおいた
ブロー成形方法を提供しようとするもので、実施例にも
示すように、押出機により押し出したチユーブ状のパリ
ソンを所定の型に入れて型締めし、パリソンの下端部を
スカート状に広げた後に、該パリソンの下端部から挿入
されるマンドレルにより前記パリソンの下端部をその軸
心方向に圧縮変形させて例えば厚肉のフランジ部を形成
し、そののちにパリソンに空気を吹き込んで所定形状に
成形するものである。Means for Solving the Problems The present invention is intended to provide a blow molding method focusing on the molding of the flange portion as described above, and as shown in Examples, a tube shape extruded by an extruder is used. After putting the parison of the parison into a predetermined mold and clamping the mold, and spreading the lower end of the parison into a skirt shape, the lower end of the parison is compressed and deformed in the axial direction by a mandrel inserted from the lower end of the parison. For example, a thick flange portion is formed, and then air is blown into the parison to form it into a predetermined shape.
実施例 第１図（Ａ）〜（Ｆ）は本発明の一実施例を示す図であ
つて、前述したインテークマニホールドの成形法につい
て例示している。Example FIGS. 1A to 1F are views showing an example of the present invention and exemplify a method for forming the intake manifold described above.
第１図（Ａ）に示すように、金型1,2が開いている状態
でこれら金型1,2の間に図示外の押出機によりチユーブ
状のパリソンＰを押し出す。この際、パリソンＰの下端
部にマンドレル３が挿入されるように金型1,2の下方に
予めマンドレル３をセツトしておく。As shown in FIG. 1 (A), a tube-shaped parison P is extruded between the molds 1 and 2 with the molds 1 and 2 open by an extruder (not shown). At this time, the mandrel 3 is previously set below the molds 1 and 2 so that the mandrel 3 is inserted into the lower end of the parison P.
そして、第１図（Ｂ）に示すように双方の金型1,2を型
締めした上でマンドレル３を上動させる。すなわち、金
型1,2を型締めし、その突起部1a,2aでパリソンＰの一部
を加圧拘束して縮径化させることにより小径部P1を形成
する一方、その小径部P1よりも下側のパリソンＰの下端
部を相対的に径方向に広げるべく拡径化させてスカート
部P2を形成する。そののちにマンドレル３を上動させ
て、第１図（Ｃ）に示すように金型1,2とマンドレル３
とで画成される空間ＲにパリソンＰの下端部のスカート
部P2を封じ込んで、その軸心方向に圧縮変形させること
により所定の肉厚のフランジ部Ｆを成形する。この場
合、マンドレル３の移動量を調整することによつてフラ
ンジ部Ｆの肉厚を相対的に大きくすることができる。Then, as shown in FIG. 1 (B), both dies 1 and 2 are clamped, and then the mandrel 3 is moved upward. That is, the molds 1 and 2 are clamped, and a small diameter portion P 1 is formed by pressing and restraining a part of the parison P by the projections 1a and 2a to reduce the diameter, while the small diameter portion P 1 The lower end of the lower parison P is enlarged to relatively widen in the radial direction to form the skirt portion P 2 . After that, the mandrel 3 is moved upward, and the molds 1 and 2 and the mandrel 3 are moved as shown in FIG. 1 (C).
The skirt portion P 2 at the lower end portion of the parison P is enclosed in the space R defined by and, and the flange portion F having a predetermined wall thickness is formed by compressively deforming in the axial direction. In this case, the wall thickness of the flange portion F can be relatively increased by adjusting the movement amount of the mandrel 3.
こののち、常法によりパリソンＰ内部に空気を吹き込ん
で所定形状に成形し、第１図（Ｄ），（Ｅ）に示すよう
に圧縮成形に伴うばりＢを除去することで第１図（Ｆ）
のような成形品たるインテークマニホールドＭを得る。After that, air is blown into the parison P by a conventional method to form a predetermined shape, and as shown in FIGS. 1 (D) and 1 (E), the flash B accompanying the compression molding is removed to remove the flash B from FIG. )
An intake manifold M that is a molded product such as the above is obtained.
ここで、金型1,2およびマンドレル３のうちフランジ部
Ｆに近い部分に加熱手段を配置すると、フランジ部Ｆの
成形性が一段とよくなる。Here, if the heating means is arranged in a portion of the molds 1, 2 and the mandrel 3 near the flange portion F, the moldability of the flange portion F is further improved.
またマンドレル３の形状としは第２図に示す形状のもの
を用いることもできる。The mandrel 3 may have the shape shown in FIG.
発明の効果 本発明によれば、パリソンに空気を吹き込むのに先立つ
て、パリソンの端部を圧縮してフランジ部を成形するよ
うにしたため、従来のような接合の手間が省けるばかり
でなく、接合による強度低下がなくなつて信頼性が向上
し、さらにブロー成形法の利点である成形品内面の平滑
さが損われることがない。Advantageous Effects of Invention According to the present invention, prior to blowing air into the parison, the end portion of the parison is compressed to form the flange portion. As a result, the strength is not reduced and the reliability is improved, and the smoothness of the inner surface of the molded product, which is an advantage of the blow molding method, is not impaired.
加えて、フランジ部は、パリソンの下端部を一旦スカー
ト状に広げた後にこれを軸心方向に圧縮変形させること
により形成されることから、フランジ径を大きくできる
利点がある。In addition, since the flange portion is formed by temporarily expanding the lower end portion of the parison into a skirt shape and then compressing and deforming the same in the axial direction, there is an advantage that the flange diameter can be increased.
第１図（Ａ），（Ｂ），（Ｃ），（Ｄ），（Ｅ），
（Ｆ）は本発明の一実施例を示す工程説明図、第２図は
本発明の他の実施例を示す説明図、第３図はアルミ合金
製のインテークマニホールドの斜視図である。 1,2……金型、３……マンドレル、Ｍ……インテークマ
ニホールド（成形品）、Ｐ……パリソン、P1……小径
部、P2……スカート部、Ｆ……フランジ部。1 (A), (B), (C), (D), (E),
(F) is a process explanatory view showing one embodiment of the present invention, FIG. 2 is an explanatory view showing another embodiment of the present invention, and FIG. 3 is a perspective view of an intake manifold made of an aluminum alloy. 1,2 ...... die, 3 ...... mandrel, M ...... intake manifold (moldings), P ...... parison, P 1 ...... small diameter portion, P 2 ...... skirt, F ...... flange.
Claims (1)
品をブロー成形法により成形する方法であって、チュー
ブ状のパリソンを所定の型に入れて型締めし、パリソン
の下端部をスカート状に広げた後に、該パリソンの下端
部から挿入されるマンドレルにより前記パリソンの下端
部をその軸心方向に圧縮変形させてフランジ部を形成
し、そののちにパリソンに空気を吹き込んで所定形状に
成形することを特徴とする中空樹脂成形品の成形方法。1. A method for molding a hollow resin molded product having a flange portion at its end by a blow molding method, wherein a tubular parison is put in a predetermined mold and clamped, and the lower end of the parison is fixed. After expanding into a skirt, the lower end of the parison is compressed and deformed in the axial direction by a mandrel inserted from the lower end of the parison to form a flange portion, and then air is blown into the parison to form a predetermined shape. A method for molding a hollow resin molded product, which comprises molding into a hollow resin molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61249862A JPH0767733B2 (en) | 1986-10-21 | 1986-10-21 | Molding method for hollow resin moldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61249862A JPH0767733B2 (en) | 1986-10-21 | 1986-10-21 | Molding method for hollow resin moldings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63104815A JPS63104815A (en) | 1988-05-10 |
| JPH0767733B2 true JPH0767733B2 (en) | 1995-07-26 |
Family
ID=17199293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61249862A Expired - Lifetime JPH0767733B2 (en) | 1986-10-21 | 1986-10-21 | Molding method for hollow resin moldings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0767733B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538769A (en) * | 1991-07-19 | 1993-02-19 | Mitsutoyo Jushi Kk | Injection molding a thick flange on the end of a blow molded tube |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS498561U (en) * | 1972-04-24 | 1974-01-24 | ||
| US4097570A (en) * | 1976-04-15 | 1978-06-27 | Owens-Illinois, Inc. | Method for making plastic articles |
| JPS60135228A (en) * | 1983-12-23 | 1985-07-18 | Yoji Araki | Blow molding method and apparatus of containers with nozzle connecting cylindrical openings |
-
1986
- 1986-10-21 JP JP61249862A patent/JPH0767733B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63104815A (en) | 1988-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0538769A (en) | Injection molding a thick flange on the end of a blow molded tube | |
| JPH09164586A (en) | Bent tube manufacturing method | |
| US9784399B2 (en) | Damper for air lines of an internal combustion engine having a turbocharger and method for producing said damper | |
| WO1998016365A1 (en) | Hollow tubular body for air intake duct, mold therefor, and method of molding the same | |
| JPH0745853B2 (en) | Intake manifold and method of manufacturing the same | |
| JPS63104815A (en) | Molding method for hollow resin molded product | |
| JPH0739147B2 (en) | Resin incandescent hold | |
| JPH081157B2 (en) | Manufacturing method of synthetic resin intake pipe for engine | |
| JPH05147065A (en) | Injection molding method for producing reinforced plastic article and article molded by said method | |
| JPH0688320B2 (en) | Blow molding method for resin products | |
| CN223720115U (en) | Equipment for fabricating solid high-sided polyethylene steel wire composite reinforcement on the outer wall of pipes | |
| JP3126923B2 (en) | Golf ball manufacturing method | |
| JP2789832B2 (en) | Blow molding equipment | |
| JP3220479B2 (en) | Manufacturing method of hollow molded product with flange | |
| JP2552376B2 (en) | Manufacturing method of hollow disappearance model | |
| JPH0754601Y2 (en) | Hollow molded duct with protrusion | |
| JPH0639123B2 (en) | Molding method for blow molding with flange | |
| JPH09193175A (en) | Method for manufacturing composite core and hollow resin molded product | |
| KR20020032873A (en) | Plastic inlet pipe for vehicle and manufacturing method of that | |
| JPH06280700A (en) | Manufacture of intake manifold | |
| JPS6330849B2 (en) | ||
| KR100195046B1 (en) | Molding method for prototype vehicle | |
| JPS585739B2 (en) | Manufacturing method for bottomed hollow steel ingot | |
| JPS58132525A (en) | Manufacture of blow-molded product having projection | |
| JPH02171228A (en) | Blow molding method for integrally molding interior trim part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |