JPS63295852A - Manufacture of synthetic resin intake pipe for engine - Google Patents
Manufacture of synthetic resin intake pipe for engineInfo
- Publication number
- JPS63295852A JPS63295852A JP13084087A JP13084087A JPS63295852A JP S63295852 A JPS63295852 A JP S63295852A JP 13084087 A JP13084087 A JP 13084087A JP 13084087 A JP13084087 A JP 13084087A JP S63295852 A JPS63295852 A JP S63295852A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- core
- mold
- intake pipe
- injection
- 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.)
- Granted
Links
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 47
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 9
- 239000000945 filler Substances 0.000 abstract description 6
- 229920001169 thermoplastic Polymers 0.000 abstract description 3
- 239000004416 thermosoftening plastic Substances 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 238000000071 blow moulding Methods 0.000 description 13
- 238000009423 ventilation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14836—Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
- B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C2045/1445—Coating a portion of the article, e.g. the edge of the article injecting a part onto a blow moulded object
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14942—Floating inserts, e.g. injecting simultaneously onto both sides of an insert through a pair of opposed gates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/08—Thermoplastics
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車用エンジンに用いられる合成樹脂製吸
気管の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a synthetic resin intake pipe used in an automobile engine.
（従来の技術）
従来、合成樹脂製吸気管の製造方法としては、例えば特
開昭５８−８２０５９号公報等に開示されるものが知ら
れている。(Prior Art) Conventionally, as a method for manufacturing a synthetic resin intake pipe, the method disclosed in, for example, Japanese Patent Application Laid-Open No. 58-82059 is known.
この従来の製造方法は、低融点合金で形成される中空中
子を予め用意し、該中空中子を射出成形用金型内にセッ
トし、次いで、熱可塑性合成樹脂を金型内に射出し、樹
脂が固化した後、樹脂が溶解せず低融点合金による中空
中子のみが溶解する温度で加熱し、中空中子を溶出して
合成樹脂製吸気管を得るようにしている。In this conventional manufacturing method, a hollow core made of a low melting point alloy is prepared in advance, the hollow core is set in an injection mold, and then a thermoplastic synthetic resin is injected into the mold. After the resin is solidified, it is heated at a temperature at which only the hollow core made of the low melting point alloy melts without melting the resin, and the hollow core is eluted to obtain a synthetic resin intake pipe.
（発明が解決しようとする問題点）
しかしながら、この従来の製造方法にあっては、合成樹
脂射出時の中空中子の支持、特に合成樹脂の射出ゲート
部位における支持が不十分であったため、樹脂の射出圧
等により中空中子が所定位置からズしてしまい合成樹脂
層の肉厚が一定でなくなることがあるという問題点があ
った。(Problems to be Solved by the Invention) However, in this conventional manufacturing method, support for the hollow core during synthetic resin injection, especially at the injection gate portion of the synthetic resin, was insufficient, so the resin There is a problem in that the hollow core may be displaced from a predetermined position due to the injection pressure, etc., and the thickness of the synthetic resin layer may not be constant.
（問題点を解決するための方法）
本発明は、上述のような問題点を解決することを目的と
し、この目的達成のために本発明では、吸気管の管路形
状に対応した曲がり形状の中子を形成し、この中子を吸
気管形状を成す射出成形用金型内に配し、該射出成形用
金型内に対向して設けられた射出ゲートを含む平面上に
少なくとも１対設けられている支持ピンで中子を支持し
、その後、合成樹脂材を射出ゲートから金型と中子間に
射出し、この合成樹脂層が固化する前に支持ピンを合成
樹脂層から抜くようにしたことを特徴とする方法とした
。(Method for Solving the Problems) The present invention aims to solve the above-mentioned problems, and in order to achieve this purpose, the present invention has a bent shape corresponding to the shape of the intake pipe. A core is formed, the core is placed in an injection mold having an intake pipe shape, and at least one pair of cores are provided on a plane including injection gates provided facing each other in the injection mold. After that, the synthetic resin material is injected from the injection gate between the mold and the core, and the support pins are pulled out from the synthetic resin layer before the synthetic resin layer solidifies. This method is characterized by the fact that
（作 用）
従って、本発明のエンジン用合成樹脂製吸気管の製造方
法によれば、合成樹脂を対向する射出ゲートから射出し
、かつ、この射出時に中子を射出ゲートと同一平面に少
なくとも１対設けられた支持ピンにより支持するように
したため、中子に対する射出圧が相殺されて中子に位置
ズレが生じ難く、さらに、この射出圧を受けるのと同一
平面において中子を支持ピンで支持するから一層中子に
位置ズレが生じ難くなる。(Function) Therefore, according to the method of manufacturing a synthetic resin intake pipe for an engine of the present invention, the synthetic resin is injected from the opposing injection gates, and at the time of this injection, at least one core is placed on the same plane as the injection gate. Since the core is supported by a pair of support pins, the injection pressure on the core is canceled out, making it difficult for the core to be misaligned.Furthermore, the core is supported by the support pin on the same plane that receives this injection pressure. This makes it even more difficult for the core to become misaligned.
従って、合成樹脂の射出時に中子が所定位置からズレる
ことがないようにでき、それによって合成樹脂層を一定
厚に保って一定の製品精度を得ることができる。Therefore, it is possible to prevent the core from shifting from a predetermined position during injection of the synthetic resin, thereby making it possible to maintain a constant thickness of the synthetic resin layer and obtain a constant product accuracy.
また、支持ピンは合成樹脂の固化前に合成樹脂層から抜
くため、支持ピンにより生じる合成樹脂層の穴にその回
りの可塑状態の樹脂が流れ込んで埋められ固化時に吸気
管に支持ピンの穴があくことはない。In addition, since the support pin is removed from the synthetic resin layer before the synthetic resin solidifies, the plastic resin around it flows into and fills the hole in the synthetic resin layer created by the support pin, and when it solidifies, the support pin hole is formed in the intake pipe. It never gets cold.
（実 施 例） 以Ｆ、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, embodiments of the present invention will be described based on the drawings.
第１図は本発明に係るエンジン用合成樹脂製吸気管（以
下、吸気管と称する）の第１実施例を示す断面図である
。FIG. 1 is a sectional view showing a first embodiment of a synthetic resin intake pipe for an engine (hereinafter referred to as an intake pipe) according to the present invention.
吸気管１０は、ブロー成形製の内層１１と、この内層１
１の外周に被覆された外層１２と、この外層１２の端部
に一体的に形成されたフランジ部１３と、ダクト部１４
の途中に一体的に形成された通気パイプ（突出機能部位
）１６とから構成され、ダクト部１４の内側は吸気管路
１５とされている。また、内層１１及び外層１２は均一
な肉厚に形成されている。The intake pipe 10 includes an inner layer 11 made of blow molding, and an inner layer 1 made of blow molding.
1, a flange portion 13 integrally formed at the end of this outer layer 12, and a duct portion 14.
The inside of the duct portion 14 is an intake pipe line 15. Further, the inner layer 11 and the outer layer 12 are formed to have uniform thickness.
尚、前記通気パイプ１６には、吸気量センサのピックア
ップパイプやブローバイガス環流パイプ等が接続される
。Note that the ventilation pipe 16 is connected to a pickup pipe of an intake air amount sensor, a blow-by gas recirculation pipe, and the like.
次に、第２図に示す上記吸気管１０の製造方法を順を追
って説明する。Next, a method for manufacturing the intake pipe 10 shown in FIG. 2 will be explained step by step.
先ず、第２図（ａ）の如く、目的とする吸気管１０に於
ける吸気管路１５の形状に見合った曲がり管２０をブロ
ー成形によって作成する。周知の如く、ブロー成形では
曲り管２０の形状が如何に複雑であっても成形すること
が可能である。First, as shown in FIG. 2(a), a bent pipe 20 matching the shape of the intake pipe path 15 in the intended intake pipe 10 is created by blow molding. As is well known, blow molding allows the curved pipe 20 to be formed no matter how complicated its shape.
次に、第２図（ｂ）の如く、ブロー成形された曲り管２
０内に、射出成形時の高圧に抗じて曲り管２０の形状を
変形させない充填材２１、例えばセラミックス等のよう
な微粒の砂或いは非圧縮性の液体を充填する。Next, as shown in FIG. 2(b), the bent pipe 2 is blow-molded.
0 is filled with a filler 21 that does not deform the shape of the bent tube 20 against high pressure during injection molding, such as fine sand such as ceramics or an incompressible liquid.
その後、第２図（Ｃ）の如く、変形しないように処理を
施した曲り管２０を、射出成形用金型２２内に中子とし
てセットする。Thereafter, as shown in FIG. 2(C), the bent pipe 20, which has been treated to prevent deformation, is set as a core in an injection mold 22.
この射出成形用金型２２には、横断面図である第３図及
び縦断面図である第４図に示すように、１対の射出ゲー
）２４，２４が対向して複数箇所に設けられ、かつ、こ
の１対の射出ゲート２４゜２４を含む同一平面上であっ
て射出ゲート２４゜２４を結ぶ線に対して直角の位置に
１対の支持ピン２５．２５が設けられている。この支持
ピン２５は金型２２に対して出入可能に設けられていて
、この支持ピン２５を突出状態にして曲り管２０（中子
）を支持することで、上記的り管２０のセットを行う。As shown in FIG. 3, which is a cross-sectional view, and FIG. 4, which is a longitudinal sectional view, this injection mold 22 is provided with a pair of injection games 24, 24 facing each other at a plurality of locations. , and a pair of support pins 25, 25 are provided on the same plane containing the pair of injection gates 24.degree. 24 and at positions perpendicular to a line connecting the injection gates 24.degree. This support pin 25 is provided so as to be able to move in and out of the mold 22, and by supporting the bent tube 20 (core) with this support pin 25 in a protruding state, the above-mentioned target tube 20 is set. .
この状態で第２図（ｄ）の如く、熱可塑性の合成樹脂材
を射出成形用金型２２内に射出し、金型２２と曲り管２
０とで形成される空間２３内に充填する。In this state, as shown in FIG. 2(d), a thermoplastic synthetic resin material is injected into the injection mold 22, and the mold 22 and the bent pipe 2 are
The space 23 formed by 0 and 0 is filled.
この合成樹脂の射出時に曲り管（中子）２０に対し射出
圧がかかるが、射出ゲート２４．２４を対向させている
のでその射出圧は相殺されて曲り管２０に対する影響は
少なく曲り管（中子）２０の位置ズレが生じ難い。When this synthetic resin is injected, injection pressure is applied to the bent tube (core) 20, but since the injection gates 24 and 24 are facing each other, this injection pressure is canceled out and has little effect on the bent tube (core) 20. Child) 20 is less likely to be misaligned.
また、曲り管２０をブロー成形により樹脂で形成してい
るため、射出圧によって射出ゲート２４に対し直角方向
に変形したり、その方向へ移動しようとしたりする恐れ
があるが、この位置を支持ピン２５で支持しているため
、その変形及び移動が生じ難い。Furthermore, since the bent tube 20 is made of resin by blow molding, there is a risk that it may deform or move in a direction perpendicular to the injection gate 24 due to the injection pressure. Since it is supported by 25, its deformation and movement are unlikely to occur.
尚、この際の成形条件は、使用材料、形状等考慮して常
法に従って行なう。Note that the molding conditions at this time are carried out in accordance with conventional methods, taking into consideration the materials used, shape, etc.
そして、合成樹脂が固化する前のまだ可塑性を有してい
るうちに支持ピン２５を外層１２（空間２３であった部
分）から金型２２内に退入させると、支持ピン２５が位
置していた部分にも樹脂が流れ込んで樹脂で埋まる。Then, when the support pin 25 is moved into the mold 22 from the outer layer 12 (the part that was the space 23) while the synthetic resin is still plastic before solidifying, the support pin 25 is positioned. The resin also flows into the exposed areas and fills them with resin.
その後、合成樹脂が固化して、曲り管２０の外側には射
出された合成樹脂材が一体的に被覆して外層１２を形成
すると共に、一端部にフランジ部１３が、ダクト部１４
に通気パイプ１６が形成される。Thereafter, the synthetic resin solidifies, and the outside of the bent pipe 20 is integrally covered with the injected synthetic resin material to form the outer layer 12. At the same time, a flange portion 13 is formed at one end and a duct portion 14 is formed.
A ventilation pipe 16 is formed.
成形が完了すると、金型２２を型開きして成形品を取り
出し、曲り管２０内の充填材２１を取り出し、さらに、
通気パイプ１６の内径と同じ穴を内層１１にあけてパイ
プ穴１６ａとすること・で、第１図に示す吸気管１０を
得ることができる。When the molding is completed, the mold 22 is opened to take out the molded product, the filler 21 inside the bent tube 20 is taken out, and further,
The intake pipe 10 shown in FIG. 1 can be obtained by making a hole in the inner layer 11 with the same diameter as the inside diameter of the ventilation pipe 16 to serve as the pipe hole 16a.
第５図は本発明に係る吸気管１０の第２実施例を示す断
面図である。FIG. 5 is a sectional view showing a second embodiment of the intake pipe 10 according to the present invention.
この第２実施例は、機能部位であるフランジ部１３と通
気パイプ１６との強度をさらに高めるようにした例であ
る。This second embodiment is an example in which the strength of the flange portion 13 and the ventilation pipe 16, which are functional parts, is further increased.
次に、第５図に示す上記吸気管ｌＯの製造方法を順を追
って説明する。Next, a method for manufacturing the intake pipe IO shown in FIG. 5 will be explained step by step.
先ず、第６図（ａ）の如く、目的とする吸気管１０に於
ける吸気管路１５の形状に見合った曲り管２０をブロー
成形によって作成する。First, as shown in FIG. 6(a), a bent pipe 20 matching the shape of the intake pipe path 15 in the intended intake pipe 10 is created by blow molding.
この曲り管２０のブロー成形時には、フランジ用突起部
２０ａ及び通気パイプ用突起部２０ｂも同時に成形する
。When the bent pipe 20 is blow-molded, the flange projection 20a and the ventilation pipe projection 20b are also molded at the same time.
次に、第６図（ｂ）の如く、ブロー成形された曲り管２
０内に、射出成形時の高圧に抗して曲り管２０の形状を
変形させない充填材２１を充填する。Next, as shown in FIG. 6(b), the bent pipe 2 is blow-molded.
0 is filled with a filler 21 that does not deform the shape of the bent pipe 20 against high pressure during injection molding.
その後、第６図（Ｃ）の如く、変形しないように処理を
施した曲り管２０を、射出成形用金型２２内に中子とし
てセットする。Thereafter, as shown in FIG. 6(C), the bent pipe 20, which has been treated to prevent deformation, is set as a core in an injection mold 22.
この金型には第７図に示すように、１対の射出ゲー）
２４．２４と同一平面上に２対の支持ピン２５．２５，
２５．２５が設けられていて、この支持ピン２５で支持
して曲り管２０をセットする。This mold has a pair of injection gauges as shown in Figure 7.
24. Two pairs of support pins 25.25 on the same plane as 24,
25.25 is provided, and the bent pipe 20 is set by supporting it with this support pin 25.
この状態で、第６図（ｄ）の如く、合成樹脂材を射出成
形用金型２２内に射出し、金型２２と曲り管２０とで形
成される空間２３内に充填し、合成樹脂の固化前に支持
ピン２５を外層１２（空間２３であった部分）から金型
２２内に退入させ、支持ピン２５が位置していた部分の
空間２３を樹脂で埋める。In this state, as shown in FIG. 6(d), a synthetic resin material is injected into the injection mold 22, filling the space 23 formed by the mold 22 and the bent pipe 20, and the synthetic resin material is Before solidification, the support pins 25 are moved into the mold 22 from the outer layer 12 (the part that was the space 23), and the space 23 where the support pins 25 were located is filled with resin.
その後、合成樹脂が固化し、曲り管２０の外側には射出
された合成樹脂材が一体的に被覆して外層１２を形成す
ると共に、一端部に補強内層１３ａを有するフランジ部
１３が、ダクト部１４に補強内層１６ｂを有する通気パ
イプ１６が形成される。After that, the synthetic resin is solidified, and the outside of the bent pipe 20 is integrally covered with the injected synthetic resin material to form the outer layer 12, and the flange part 13 having the reinforcing inner layer 13a at one end is attached to the duct part. 14 is formed with a ventilation pipe 16 having a reinforcing inner layer 16b.
成形が完了すると、金型２２を型開きして成形品を取り
出し、曲り管２０内の充填材２１を取り出し、さらに、
通気パイプ用突起部２０ｂの上部を切断しパイプ穴１６
ａとすることで、第５図に示す吸気管ｌＯを得ることが
できる。When the molding is completed, the mold 22 is opened to take out the molded product, the filler 21 inside the bent tube 20 is taken out, and further,
Cut the upper part of the ventilation pipe protrusion 20b and make a pipe hole 16.
By setting a, the intake pipe IO shown in FIG. 5 can be obtained.
以上のように、本実施例の吸気管ｌＯの製造方法によれ
ば、以下に述べるような効果が達成される。As described above, according to the method for manufacturing the intake pipe IO of this embodiment, the following effects are achieved.
■ この合成樹脂の射出を対向する射出ゲート２４．２
４から行うようにしたため、その射出圧は相殺されて曲
り管（中子）２０に対する影響は少なく曲り管（中子）
２０の位置ズレが生じ難い。■ Injection gate 24.2 facing the injection of this synthetic resin
4, the injection pressure is canceled out and the effect on the bent tube (core) 20 is small.
Positional deviation of 20 is less likely to occur.
よって、外層１２の肉厚を一定にすることができ製品精
度を向上させることかで・きる。Therefore, the thickness of the outer layer 12 can be made constant and product precision can be improved.
■ 曲り管（中子）２０をブロー成形により樹脂で形成
しているため、射出圧によって射出ゲート２４に対し直
角方向に変形したり、その方向へ移動しようとしたりす
る恐れがあるが、この位置を支持ピン２５で支持してい
るため、その変形及び移動が生じ難い、よってこれによ
っても、外層１２の肉厚を一定に保ち製品精度を向上さ
せることができる。■ Since the bent tube (core) 20 is made of resin by blow molding, there is a risk that it may deform or move in a direction perpendicular to the injection gate 24 due to the injection pressure. Since it is supported by the support pins 25, deformation and movement of the outer layer 12 is difficult to occur.This also makes it possible to keep the thickness of the outer layer 12 constant and improve product precision.
■ ブロー成形により成形された合成樹脂製の曲り管２
０が射出成形時に中子の機能を果しながら製品と一体化
する為、独立した中子成形工程及び加熱による中子溶出
工程が不要になり、合成樹脂製の吸気管１０を、工程数
が少なく短時間で且つコスト安に製造出来る。■ Bent pipe 2 made of synthetic resin molded by blow molding
0 is integrated with the product while performing the function of a core during injection molding, so a separate core molding process and core elution process by heating are no longer required, and the synthetic resin intake pipe 10 can be manufactured with fewer steps. It can be manufactured in a short time and at low cost.
■ ブロー成形による合成樹脂製油り管２゜は、最終的
に得られる吸気管１０の内層１１となり、この内層１１
と射出成形による外層１２との二重構造により、管厚の
バラツキ防止や高い管強度の確保が達成される。■ The synthetic resin oil pipe 2° made by blow molding becomes the inner layer 11 of the intake pipe 10 finally obtained, and this inner layer 11
The double structure of the outer layer 12 formed by injection molding prevents variations in tube thickness and ensures high tube strength.
■ 機能部位であるフランジ部１３や通気パイプ１６は
、外層１２と共に射出成形時に形成される為、別工程で
の成形や接合を要さず、機能部位付加のための工程が省
略出来る。(2) Since the flange portion 13 and ventilation pipe 16, which are functional parts, are formed together with the outer layer 12 during injection molding, there is no need for molding or joining in a separate process, and the process for adding functional parts can be omitted.
■ 機能部位であるフランジ部１３や通気バイブ１６は
、外層１２と一体に形成される為、外力を受けても強度
的信頼性が高い。- Since the flange portion 13 and the ventilation vibrator 16, which are functional parts, are formed integrally with the outer layer 12, their strength and reliability are high even when subjected to external forces.
■ 第２実施例にあっては、機能部位であるフランジ部
１３や通気バイブ１６が内外層による二重構造となる為
、機能部位の強度がさらに向上し、特に大きな破壊応力
（振動や疲労等）が加わる場合に有用である。■ In the second embodiment, the functional parts such as the flange part 13 and the ventilation vibrator 16 have a double structure with inner and outer layers, so the strength of the functional parts is further improved, and especially high breaking stress (such as vibration and fatigue) is achieved. ) is useful when added.
以上、本発明を実施例により説明してきたが、具体的な
製造工程については、この実施例に限られるものではな
く、本発明の要旨を変更しない範囲における工程の追加
や工程の変更があっても本発明に含まれる。Although the present invention has been described above with reference to examples, the specific manufacturing process is not limited to these examples, and there may be additions or changes to the process without changing the gist of the present invention. are also included in the present invention.
例えば、上記実施例では、中子としてブロー成形により
形成し、吸気管の内層となる曲り管２０を用いた例を示
したが、中子として低融点合金を用いてもよい。For example, in the above embodiment, the bent pipe 20 formed by blow molding and serving as the inner layer of the intake pipe is used as the core, but a low melting point alloy may be used as the core.
また、曲り管２０の肉厚を略均−にした場合に就いて説
明したが、肉厚を強度要求に応じて変えることも可能で
ある。Moreover, although the case where the wall thickness of the bent pipe 20 is approximately uniform has been described, it is also possible to change the wall thickness depending on strength requirements.
この場合には、ブロー成形時に任意に選定すれば良い。In this case, it may be selected arbitrarily at the time of blow molding.
更に、曲がり形状も一個所に限らず、複数個所に設けて
も良い、この場合も、ブロー成形時に処置できる為、射
出成形時に特別な処置を施す必要がない。Furthermore, the curved shape is not limited to one location, but may be provided at multiple locations.In this case as well, since this can be done during blow molding, there is no need to take any special steps during injection molding.
又、実施例では、吸気管に突出して形成された機能部位
として通気パイプの例を示したが、取付ネジ部や他の突
出した機能部位を形成しても良い。Further, in the embodiment, an example of a ventilation pipe is shown as a functional part formed to protrude from the intake pipe, but a mounting screw part or other protruding functional part may be formed.
又、第８図に示すように、ブロー成形時、フランジ用突
起部１３ａに凹凸粗面１３ｂを形成し、アンカー効果に
より内外層１３ａ、１３の密着性を高めるようにしても
良い。Further, as shown in FIG. 8, during blow molding, an uneven rough surface 13b may be formed on the flange projection 13a to enhance the adhesion between the inner and outer layers 13a and 13 due to the anchor effect.
又、本発明に係る吸気管は、エンジンに取り付ける場合
には、外気を直接吸入する場所に設けるタイプでも、タ
ーボチャージャの過給側と連結するタイプでも良い。又
、エンジンに直接取り付ける方式に限らず、エンジンに
連通ずる吸気通路を形成する経路に設けるタイプであっ
ても良い。Further, when the intake pipe according to the present invention is attached to an engine, it may be of a type provided at a place where outside air is directly taken in, or of a type connected to the supercharging side of a turbocharger. Moreover, the system is not limited to a system in which the system is directly attached to the engine, but a system in which the system is installed in a path that forms an intake passage that communicates with the engine may be used.
（発明の効果）
以上のように本発明の製造方法にあっては、対向位置か
ら合成樹脂を射出し、この射出を行う射出ゲートを含む
平面上に少なくとも１対設けられている支持ピンで中子
を支持し、合成樹脂層が固化する前に支持ピンを合成樹
脂層から抜くようにしたために１合成樹脂の射出時に射
出圧等により中子が所定位置からズレることがないよう
にでき、それによって合成樹脂層の肉厚を一定に保って
高い製品精度を得ることができ、しかも、支持ピンによ
る穴が吸気管にあくことのないようにできるという効果
が得られる。(Effects of the Invention) As described above, in the manufacturing method of the present invention, synthetic resin is injected from opposing positions, and at least one pair of support pins are provided on a plane including an injection gate for performing this injection. By supporting the core and pulling out the support pin from the synthetic resin layer before the synthetic resin layer solidifies, it is possible to prevent the core from shifting from the specified position due to injection pressure etc. during injection of the synthetic resin. This makes it possible to maintain a constant thickness of the synthetic resin layer and obtain high product accuracy, and also to prevent holes formed by the support pins from forming in the intake pipe.
第１図は本発明に係るエンジン用合成樹脂製吸気管の第
１実施例を示す断面図、第２図は第１実施例の製造工程
を示す説明図、第３図は第１実施例の製造工程を示す横
断面図、第４図は第１実施例の製造工程を示す縦断面図
、第５図は本発明に係るエンジン用合成樹脂製吸気管の
第２実施例を示す断面図、第６図は第２実施例の製造工
程を示す説明図、第７図は第２実施例の製造工程を示す
縦断面図、第８図はフランジ部の他の補強構造を示す要
部断面図である。
１０・・・エンジン用合成樹脂製吸気管１２・・・外層
（合成樹脂層）
１５・・・吸気管路（管路）
２０・・・曲り管（中子）
２２・・・射出成形用金型
２４・・・射出ゲート
２５・・・支持ピン
特 許 出 願 人
日本ラヂヱーター株式会社
第３図Fig. 1 is a sectional view showing a first embodiment of a synthetic resin intake pipe for an engine according to the present invention, Fig. 2 is an explanatory diagram showing the manufacturing process of the first embodiment, and Fig. 3 is a cross-sectional view of the first embodiment. 4 is a longitudinal sectional view showing the manufacturing process of the first embodiment; FIG. 5 is a sectional view showing the second embodiment of the synthetic resin intake pipe for engines according to the present invention; Fig. 6 is an explanatory diagram showing the manufacturing process of the second embodiment, Fig. 7 is a longitudinal sectional view showing the manufacturing process of the second embodiment, and Fig. 8 is a sectional view of main parts showing another reinforcing structure of the flange part. It is. 10... Synthetic resin intake pipe for engine 12... Outer layer (synthetic resin layer) 15... Intake pipe line (pipe line) 20... Bent pipe (core) 22... Injection molding metal Mold 24...Injection gate 25...Support pin patent application Hito Nippon Radiator Co., Ltd. Figure 3
Claims (1)
形成し、この中子を吸気管形状を成す射出成形用金型内
に配し、該射出成形用金型内に対向して設けられた射出
ゲートを含む平面上に少なくとも１対設けられている支
持ピンで中子を支持し、その後、合成樹脂材を射出ゲー
トから金型と中子間に射出し、この合成樹脂層が固化す
る前に支持ピンを合成樹脂層から抜くようにしたことを
特徴とするエンジン用合成樹脂製吸気管の製造方法。(1) A core with a curved shape corresponding to the shape of the intake pipe is formed, this core is placed in an injection mold forming the shape of the intake pipe, and the core is placed facing the inside of the injection mold. The core is supported by at least one pair of support pins provided on a plane including an injection gate provided at A method for manufacturing a synthetic resin intake pipe for an engine, characterized in that the support pin is removed from the synthetic resin layer before the resin solidifies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13084087A JPH081157B2 (en) | 1987-05-27 | 1987-05-27 | Manufacturing method of synthetic resin intake pipe for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13084087A JPH081157B2 (en) | 1987-05-27 | 1987-05-27 | Manufacturing method of synthetic resin intake pipe for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63295852A true JPS63295852A (en) | 1988-12-02 |
| JPH081157B2 JPH081157B2 (en) | 1996-01-10 |
Family
ID=15043927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13084087A Expired - Fee Related JPH081157B2 (en) | 1987-05-27 | 1987-05-27 | Manufacturing method of synthetic resin intake pipe for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081157B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03221423A (en) * | 1990-01-29 | 1991-09-30 | Daikyo Inc | Production of plastic tubular body and structure of mold |
| JPH05147069A (en) * | 1991-11-26 | 1993-06-15 | Yazaki Kako Kk | Method for forming rib or the like to resin coated steel pipe |
| JPH09155933A (en) * | 1995-12-12 | 1997-06-17 | Masahiro Furusawa | Resin flexible nozzle and injection molding method of hollow material in continuous form |
| US6251332B1 (en) | 1990-11-26 | 2001-06-26 | Excell Corporation | Method for manufacturing a multilayer plastic pipe |
| JP2003525437A (en) * | 2000-03-02 | 2003-08-26 | マイクロ・モーション・インコーポレーテッド | Method and apparatus for manufacturing Coriolis flowmeters mainly composed of plastic |
| CN103203831A (en) * | 2013-02-27 | 2013-07-17 | 德尔福派克电气***有限公司 | Novel insert injection molding process |
| CN107444282A (en) * | 2016-05-31 | 2017-12-08 | 高铁工业股份有限公司 | Bicycle link rod for cart combine closely construction and manufacture method |
-
1987
- 1987-05-27 JP JP13084087A patent/JPH081157B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03221423A (en) * | 1990-01-29 | 1991-09-30 | Daikyo Inc | Production of plastic tubular body and structure of mold |
| US6251332B1 (en) | 1990-11-26 | 2001-06-26 | Excell Corporation | Method for manufacturing a multilayer plastic pipe |
| US6537484B2 (en) | 1990-11-26 | 2003-03-25 | Excell Corporation | Method for manufacturing a multi-layer plastic pipe |
| JPH05147069A (en) * | 1991-11-26 | 1993-06-15 | Yazaki Kako Kk | Method for forming rib or the like to resin coated steel pipe |
| JPH09155933A (en) * | 1995-12-12 | 1997-06-17 | Masahiro Furusawa | Resin flexible nozzle and injection molding method of hollow material in continuous form |
| JP2003525437A (en) * | 2000-03-02 | 2003-08-26 | マイクロ・モーション・インコーポレーテッド | Method and apparatus for manufacturing Coriolis flowmeters mainly composed of plastic |
| CN103203831A (en) * | 2013-02-27 | 2013-07-17 | 德尔福派克电气***有限公司 | Novel insert injection molding process |
| CN107444282A (en) * | 2016-05-31 | 2017-12-08 | 高铁工业股份有限公司 | Bicycle link rod for cart combine closely construction and manufacture method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH081157B2 (en) | 1996-01-10 |
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