JP3325340B2 - Method for manufacturing synthetic resin tubular member - Google Patents
Method for manufacturing synthetic resin tubular memberInfo
- Publication number
- JP3325340B2 JP3325340B2 JP15820593A JP15820593A JP3325340B2 JP 3325340 B2 JP3325340 B2 JP 3325340B2 JP 15820593 A JP15820593 A JP 15820593A JP 15820593 A JP15820593 A JP 15820593A JP 3325340 B2 JP3325340 B2 JP 3325340B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- synthetic resin
- mold
- tubular member
- mating surface
- 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 - Fee Related
Links
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明に係る合成樹脂製管状部材
の製造方法は、例えば自動車用エンジンのシリンダ内に
空気を送り込む為の吸気管や吸気マニホールドを合成樹
脂により製造するのに利用する。The method of manufacturing a tubular member made of synthetic resin according to the present invention is used, for example, for manufacturing an intake pipe or an intake manifold for sending air into a cylinder of an automobile engine using synthetic resin.
【０００２】[0002]
【従来の技術】自動車用エンジンのシリンダ内に送り込
む為の空気は、エアクリーナから取り入れられた後、ダ
クト並びに吸気管を通過し、この吸気管の下流側端部に
設けられた燃料噴射装置（或はキャブレータ）によりガ
ソリンを送り込まれ、混合気とされてから、吸気マニホ
ールドを通過して、上記シリンダ内に送り込まれる。2. Description of the Related Art After being taken in from an air cleaner, air for feeding into a cylinder of an automobile engine passes through a duct and an intake pipe, and a fuel injection device (or a fuel injection device) provided at a downstream end of the intake pipe. The gasoline is fed by a carburetor) to form an air-fuel mixture, and then passes through an intake manifold and is fed into the cylinder.
【０００３】上記吸気マニホールドや吸気管（以下、こ
れらを総称して吸気管等とする。）は、従来はアルミニ
ウム合金のダイキャスト成形により造られていたが、近
年自動車の軽量化を図る為、例えば特開昭５８−８２０
５９号公報に開示されている様に、この吸気管等を合成
樹脂の射出成形により造る事が行なわれている。[0003] The above-mentioned intake manifold and intake pipe (hereinafter collectively referred to as an intake pipe and the like) are conventionally made by die-casting of an aluminum alloy. For example, JP-A-58-820
As disclosed in Japanese Unexamined Patent Publication No. 59-59, this intake pipe and the like are manufactured by injection molding of a synthetic resin.
【０００４】一方、吸気管等は中空で、しかも外面形状
並びに内面形状が三次元方向に屈曲している為、通常使
用されている様な単純な割型を有する射出成形装置によ
り造る事が出来ない。この為、三次元方向に屈曲した形
状を有する吸気管等を合成樹脂の射出成形により造る場
合、次の様にして行なっている。On the other hand, since the intake pipe and the like are hollow and the outer surface and inner surface are bent in a three-dimensional direction, they can be manufactured by an injection molding apparatus having a simple split mold as is generally used. Absent. For this reason, when an intake pipe or the like having a shape bent in a three-dimensional direction is manufactured by injection molding of a synthetic resin, it is performed as follows.
【０００５】即ち、射出成形に先立って、BiとSnとの合
金、或はBiとSnとPbとの合金の様な、低融点金属（例え
ば融点が１５０℃）により、図８に示す様な形状に造ら
れた中子１を用意する。この中子１の外面形状は、造る
べき合成樹脂製の吸気管等の内面形状と一致させる。More specifically, prior to injection molding, a low melting point metal (for example, having a melting point of 150 ° C.) such as an alloy of Bi and Sn or an alloy of Bi, Sn and Pb as shown in FIG. A core 1 made in a shape is prepared. The outer surface shape of the core 1 matches the inner surface shape of a synthetic resin intake pipe or the like to be manufactured.
【０００６】そして、造るべき吸気管等の外面形状と一
致する内面形状を有する成形型中に上記中子１をセット
した状態で、この成形型内に、上記低融点金属よりも高
い融点を持つ熱可塑性合成樹脂を注入し、成形型の内面
と中子１の外面との間の空間（キャビティ）内で固化さ
せる。In a state where the core 1 is set in a molding die having an inner surface shape that matches the outer surface shape of an intake pipe or the like to be formed, the molding die has a higher melting point than the low melting point metal. A thermoplastic synthetic resin is injected and solidified in a space (cavity) between the inner surface of the mold and the outer surface of the core 1.
【０００７】上記成形型は、図９に示す様に、上型２と
下型３とから構成される。下型３の上面には第一の合わ
せ面４、並びに、上記中子１の一端部（図８〜９の下端
部）を挿入自在な凹孔５を設けている。又、上型２の下
面には、上記第一の合わせ面４と密接する第二の合わせ
面６を設けている。更に、上記第一、第二の合わせ面
４、６同士を密接させた状態で、上記上下両型２、３を
重ね合わせる事により、これら上下両型２、３の間に、
製造すべき吸気管等の外周面形状に相当する内周面を有
する中空部７が形成される様にしている。[0007] As shown in FIG. 9, the above molding die is composed of an upper die 2 and a lower die 3. The upper surface of the lower die 3 is provided with a first mating surface 4 and a concave hole 5 into which one end (the lower end in FIGS. 8 and 9) of the core 1 can be inserted. On the lower surface of the upper die 2, a second mating surface 6 which is in close contact with the first mating surface 4 is provided. Further, the upper and lower dies 2, 3 are overlapped in a state where the first and second mating surfaces 4, 6 are in close contact with each other, so that the upper and lower dies 2, 3 are placed between the upper and lower dies 2, 3.
A hollow portion 7 having an inner peripheral surface corresponding to the outer peripheral surface shape of an intake pipe or the like to be manufactured is formed.
【０００８】中子１を成形型を構成する上、下型２、３
内にセットするには、先ず、中子１の一端部を下型３の
凹孔５内に挿入すると共に、この中子１の他端部を下型
３の上面に当接させる。次いで、上型２を下型３に向け
移動させ、上下両型２、３を、第一、第二の合わせ面
４、６同士が密接する状態で重ね合わせる。この状態に
於いて、中子１の他端部は上下両型２、３の間で挟持さ
れる。これと共に、この中子１は、上下両型２、３によ
り構成される中空部７の断面中央部に位置する。The core 1 constitutes a molding die, and the lower dies 2, 3
First, one end of the core 1 is inserted into the concave hole 5 of the lower die 3, and the other end of the core 1 is brought into contact with the upper surface of the lower die 3. Next, the upper die 2 is moved toward the lower die 3, and the upper and lower dies 2, 3 are overlapped with the first and second mating surfaces 4, 6 in close contact with each other. In this state, the other end of the core 1 is sandwiched between the upper and lower dies 2 and 3. At the same time, the core 1 is located at the center of the cross section of the hollow portion 7 formed by the upper and lower dies 2 and 3.
【０００９】成形型内に上記中子１をセットした状態
で、上記中子１の外面と成形型の内面である上記中空部
７の内面との間には、射出空間８が形成される。図９〜
１０に於いて１６は、吸気管等の端部にフランジ部を形
成する為の小凹部である。この射出空間８に、上記下型
３の側面で、上記小凹部１６の近傍に設けられた注入口
（図示せず）から、加熱溶融した熱可塑性合成樹脂を注
入する。With the core 1 set in the mold, an injection space 8 is formed between the outer surface of the core 1 and the inner surface of the hollow portion 7 which is the inner surface of the mold. FIG. 9-
Reference numeral 16 denotes a small recess for forming a flange at an end of an intake pipe or the like. A thermoplastic synthetic resin that has been heated and melted is injected into the injection space 8 from an injection port (not shown) provided near the small recess 16 on the side surface of the lower mold 3.
【００１０】上記熱可塑性合成樹脂としては、例えばガ
ラス繊維を含んだナイロン６６（例えば融点が２４０度
以上）等を採用出来る。上記射出空間８内に注入され
る、加熱溶融した熱可塑性合成樹脂の温度は、中子１を
構成する低融点金属の融点よりも高いが、熱容量が大き
く、しかも熱伝達性の良い中子１に接触する事で、直ち
に温度低下する為、上記合成樹脂の注入に伴なって中子
の一部が溶融する事はない。As the thermoplastic synthetic resin, for example, nylon 66 (for example, having a melting point of 240 ° C. or more) containing glass fibers can be used. The temperature of the heat-melted thermoplastic synthetic resin injected into the injection space 8 is higher than the melting point of the low melting point metal constituting the core 1, but has a large heat capacity and a good heat transfer property. Since the temperature is immediately lowered by contact with the core, a part of the core does not melt with the injection of the synthetic resin.
【００１１】成形型内に上記合成樹脂を注入し、固化さ
せたならば、成形型を開いて吸気管等を取り出すが、こ
の吸気管等は三次元方向に屈曲している為、前記中子１
はこの吸気管等に内包されたままの状態となる。そこ
で、この中子１を取り出す為、成形型から取り出した合
成樹脂と中子１とを、上記低融点金属の融点よりも高
く、上記合成樹脂の融点よりも低い温度Ｔ（例えば１５
０℃＜Ｔ＜２４０℃）に加温して、上記低融点金属製の
中子１を溶融させ、合成樹脂製の吸気管等の内側から除
去する。When the above synthetic resin is injected into the mold and solidified, the mold is opened to take out an intake pipe and the like. However, since the intake pipe and the like are bent in a three-dimensional direction, the above-mentioned core is bent. 1
Is kept contained in the intake pipe and the like. Therefore, in order to take out the core 1, the synthetic resin taken out of the mold and the core 1 are heated at a temperature T (for example, 15 ° C.) higher than the melting point of the low melting point metal and lower than the melting point of the synthetic resin.
The temperature is raised to 0 ° C. <T <240 ° C.) to melt the low-melting point metal core 1 and remove it from the inside of a synthetic resin intake pipe or the like.
【００１２】[0012]
【発明が解決しようとする課題】ところで、上述した様
に中子１と成形型とを用いて、合成樹脂製の吸気管等を
製造する場合、以下に述べる様な解決すべき課題が存在
する。However, when an intake pipe or the like made of synthetic resin is manufactured using the core 1 and the molding die as described above, there are the following problems to be solved. .
【００１３】即ち、成形型内にセットされた中子１は、
その一端部を下型３の凹部５に挿入しているのみであ
る。この為、吸気管等を製造すべく、上記射出空間８に
合成樹脂を注入する際に、溶融した合成樹脂が、この射
出空間８の上側部分８ａよりも早く下側部分８ｂに流入
した場合、この合成樹脂の圧力により上記中子１が、図
１０に示す様に上型２に向け移動してしまう。この様
に、中子１が移動した場合、完成後の吸気管等の肉厚が
不均一になる。That is, the core 1 set in the mold is
Only one end is inserted into the concave portion 5 of the lower mold 3. For this reason, when the synthetic resin is injected into the injection space 8 in order to manufacture an intake pipe or the like, when the molten synthetic resin flows into the lower portion 8b earlier than the upper portion 8a of the injection space 8, Due to the pressure of the synthetic resin, the core 1 moves toward the upper mold 2 as shown in FIG. As described above, when the core 1 moves, the thickness of the completed intake pipe and the like becomes uneven.
【００１４】本発明に係る合成樹脂製管状部材の製造方
法は、上述の様な事情に鑑みて発明されたものである。The method of manufacturing a synthetic resin tubular member according to the present invention has been invented in view of the above-mentioned circumstances.
【００１５】[0015]
【課題を解決する為の手段】本発明に係る合成樹脂製管
状部材の製造方法は、前述した従来の製造方法と同様、
第一の合わせ面を有する第一の型と、この第一の合わせ
面と密接する第二の合わせ面を有する第二の型と、これ
ら第一、第二の合わせ面同士を密接した状態で、両合わ
せ面同士の間に設けられる射出空間と、低融点合金によ
り造られた中子とを用い、この中子の一端を上記第一の
型に形成した凹孔内に挿入すると共に、上記中子の他端
を上記第一、第二の型同士の間で挟持する事により、上
記中子を上記射出空間の断面中央部に位置させた状態
で、上記射出空間内に加熱溶融した熱可塑性合成樹脂を
注入する事により、合成樹脂製管状部材を製造する。The method of manufacturing a tubular member made of synthetic resin according to the present invention is the same as the above-described conventional manufacturing method.
A first mold having a first mating surface, a second mold having a second mating surface in close contact with the first mating surface, and in a state in which the first and second mating surfaces are in close contact with each other. Using an injection space provided between the two mating surfaces and a core made of a low melting point alloy, and inserting one end of this core into a recess formed in the first mold, By sandwiching the other end of the core between the first and second molds, while the core is positioned at the center of the cross section of the injection space, the heat that has been heated and melted in the injection space By injecting a plastic synthetic resin, a synthetic resin tubular member is manufactured.
【００１６】特に、本発明に係る合成樹脂製管状部材の
製造方法に於いては、上記中子の一端に一体鋳造により
結合する状態で設けられた巾木部を、上記第一の型に形
成した凹孔内に挿入した状態で、この巾木部を、この第
一の型と上記第二の型との間で、直接又は別の部材を介
して挟持する事により、上記中子の一端が上記凹孔から
抜け出るのを防止する抜け止め手段を構成する事を特徴
としている。In particular, in the method of manufacturing a synthetic resin tubular member according to the present invention, one end of the core is formed by integral casting.
The skirting part provided in the connected state is formed into the first mold.
With the baseboard inserted into the formed recess,
Between one mold and the second mold directly or via another member
By holding the core , the core constitutes a retaining means for preventing one end of the core from coming out of the concave hole.
【００１７】[0017]
【作用】上述の様に構成される本発明の製造方法によれ
ば、射出空間内に加熱溶融した熱可塑性合成樹脂を注入
する際に、中子の一端が凹孔から抜け出るのが防止さ
れ、中子が移動する事がない為、肉厚が均一な管状部材
を製造出来る。しかも、本発明の場合には、第一、第二
の型に中子を設置する際に、この第一の型に形成した凹
孔にこの中子の一端を挿入すると共に、この第一の型の
一部に挿通させたピンの一部や、この中子とは別の部材
に固設したピンを、この中子の一端に設けた凹部に挿入
した状態で、第一、第二の型を組み合わせる様な、面倒
な作業を行なう必要がなくなる。又、巾木部を、第一、
第二の型の間で別の部材を介して挟持させる場合でも、
厳密な位置合わせを必要としない。この為、合成樹脂製
管状部材の製造作業の容易化を図れる。 According to the manufacturing method of the present invention configured as described above, one end of the core is prevented from falling out of the recess when the thermoplastic synthetic resin melted by heating is injected into the injection space. Since the core does not move, a tubular member having a uniform thickness can be manufactured. Moreover, in the case of the present invention, the first and second
When installing the core in the first mold, the concave formed in this first mold
Insert one end of this core into the hole and
A part of the pin inserted through the part, or a member other than this core
Insert the pin fixed to the core into the recess provided at one end of this core
In a state where the first and second molds are combined
It is not necessary to perform a complicated operation. Also, the baseboard part, first,
Even when sandwiched between the second mold via another member,
Does not require strict alignment. For this reason, made of synthetic resin
The operation of manufacturing the tubular member can be facilitated.
【００１８】[0018]
【実施例】図１〜６は、本発明に係る合成樹脂製管状部
材の製造方法の第一実施例を示している。本発明の製造
方法は、前述した従来の製造方法と同様、第一の型であ
る下側１０と第二の型である上型９とからなる成形型
と、中子１１とを使用する。上記下型１０の上面には第
一の合わせ面１２を形成し、上記上型９の下面には、上
記第一の合わせ面１２と密接する第二の合わせ面１３を
形成している。又、上記下型１０の上面及び上型９の下
面のそれぞれ中央部分には、上記第一、第二の合わせ面
１２、１３同士を密接させた場合に、製造すべき吸気管
等の外周面形状と同一の内周面を有する中空部１４が形
成される様、それぞれ所定形状の凹部を設けている。
又、上記中子１１は、前述したBiとSnとの合金等、低融
点合金により造られている。1 to 6 show a first embodiment of a method for manufacturing a synthetic resin tubular member according to the present invention. The manufacturing method of the present invention uses a molding die composed of a lower die 10 as a first die and an upper die 9 as a second die, and a core 11, similarly to the aforementioned conventional manufacturing method. A first mating surface 12 is formed on the upper surface of the lower mold 10, and a second mating surface 13 that is in close contact with the first mating surface 12 is formed on the lower surface of the upper mold 9. When the first and second mating surfaces 12 and 13 are brought into close contact with each other, the outer peripheral surface of an intake pipe or the like to be manufactured is provided at the center of the upper surface of the lower die 10 and the lower surface of the upper die 9 respectively. A recess having a predetermined shape is provided so that a hollow portion 14 having the same inner peripheral surface as the shape is formed.
The core 11 is made of a low melting point alloy such as the above-mentioned alloy of Bi and Sn.
【００１９】特に、本発明の製造方法に使用する中子１
１に於いては、図１に示す様に、その下端に抜け止め手
段を構成する巾木部１５を、この中子１１と一体鋳造す
る事により設けている。この巾木部１５は、上型９に設
けた小凹部１６よりも突出させると共に、下方に向う程
突出量が小さくなる様、倒立台形状にテーパさせる。
又、下型１０には、この巾木部１５を嵌合させる凹孔１
７が設けられており、巾木部１５を上記凹溝１７内に挿
入する事で、中子１１を下型１０に装着する様にしてい
る。In particular, core 1 used in the production method of the present invention
In FIG. 1, as shown in FIG. 1, a baseboard portion 15 constituting a retaining means at the lower end is provided by integrally casting with the core 11. The baseboard portion 15 is made to protrude from the small concave portion 16 provided in the upper die 9 and is tapered in an inverted trapezoid so that the protruding amount becomes smaller toward the lower side.
The lower die 10 has a recess 1 into which the baseboard 15 is fitted.
The core 11 is attached to the lower mold 10 by inserting the baseboard portion 15 into the concave groove 17.
【００２０】上述した様な中子１１並びに上、下型９、
１０から成る成形型を用いて、合成樹脂性の吸気管等を
製造する場合、先ず図２〜３に示す様に、巾木部１５を
下型１０の凹孔１７に内に挿入する。次いで、図４に示
す様に、上型９を下降させ、上、下型９、１０の第二、
第一の合わせ面１３、１２同士を密着させた状態で上記
上下両型９、１０を重ね合わせる。この状態に於いて上
記中子１１は、図５〜６に示す様に、上記中空部１４の
断面中央部に位置すると共に、中子１１の他端部（図５
〜６の上端部）、及び巾木部１５が上記上下両型９、１
０によって挟持される。The core 11 as described above and the upper and lower dies 9,
When manufacturing a synthetic resin intake pipe or the like using a molding die made of the base 10, first, the baseboard portion 15 is inserted into the concave hole 17 of the lower die 10 as shown in FIGS. Next, as shown in FIG. 4, the upper mold 9 is lowered, and the second
The upper and lower molds 9 and 10 are overlapped with the first mating surfaces 13 and 12 in close contact with each other. In this state, the core 11 is located at the center of the cross section of the hollow portion 14 as shown in FIGS.
6), and the baseboard 15 is the upper and lower dies 9, 1
0 pinched.
【００２１】図５〜６に示す状態となったならば、下型
１０の側面に設けた注入口から、加熱溶融した熱可塑性
合成樹脂を、上記中子１１の外面と上記中空部１４の内
面との間に形成される射出空間８内に注入する。この熱
可塑性合成樹脂としては、前述した様に、ガラス繊維を
含んだナイロン６６等を採用出来る。又、射出空間８内
に注入された合成樹脂の温度が、上記中子１１を構成す
る低融点合金の融点よりも高いにも拘らず、中子１１の
一部が溶融する事がないのは、前述した通りである。When the state shown in FIGS. 5 and 6 is reached, the thermoplastic synthetic resin, which has been heated and melted, is injected into the outer surface of the core 11 and the inner surface of the hollow portion 14 through an injection port provided on the side surface of the lower mold 10. Is injected into the emission space 8 formed between the two. As described above, nylon 66 or the like containing glass fibers can be used as the thermoplastic synthetic resin. Further, despite that the temperature of the synthetic resin injected into the injection space 8 is higher than the melting point of the low melting point alloy constituting the core 11, a part of the core 11 does not melt. , As described above.
【００２２】本発明に係る製造方法に於いては、中子１
１に巾木部１５を設け、この巾木部１５を上下両型９、
１０により挟持して、抜け止め手段を構成している為、
合成樹脂の射出時に、溶融した合成樹脂が、射出空間８
の上側部分８ａよりも早く下側部分８ｂに流入したとし
ても、この合成樹脂の圧力によって中子１１が移動する
のが防止される。従って、前記図１０に示す様に、中子
１１の背面（上型側の面）が空間の内面に接触し、当該
部分に合成樹脂が行き亙らなくなる事がない。この結
果、完成した吸気管等の肉厚が均一になる。しかも、本
発明の場合には、上、下型９、１０に中子１１を設置す
る際に、この下型１０に形成した凹孔１７にこの中子１
１の一端を挿入すると共に、この下型１０の一部に挿通
させたピンの一部や、この中子１１とは別の部材に固設
したピンを、この中子１１の一端に設けた凹部に挿入し
た状態で、上記上、下型９、１０を組み合わせる様な、
面倒 な作業を行なう必要がなくなる。この為、吸気管等
の製造作業の容易化を図れる。 In the manufacturing method according to the present invention, the core 1
1 is provided with a skirting part 15, and this skirting part 15 is
10 to constitute the retaining means,
When the synthetic resin is injected, the molten synthetic resin is injected into the injection space 8.
Even if it flows into the lower portion 8b earlier than the upper portion 8a, the core 11 is prevented from moving due to the pressure of the synthetic resin. Therefore, as shown in FIG. 10, the back surface (the upper mold surface) of the core 11 does not come into contact with the inner surface of the space, and the synthetic resin does not go over the portion. As a result, the thickness of the completed intake pipe and the like becomes uniform. And the book
In the case of the invention, the core 11 is installed on the upper and lower dies 9 and 10.
At this time, the core 1 is inserted into the recess 17 formed in the lower mold 10.
1 and one part of this lower mold 10
A part of the pin that was made to be fixed to a member other than the core 11
The inserted pin is inserted into a recess provided at one end of the core 11.
In such a state, the upper and lower dies 9, 10 are combined,
Eliminates the need for troublesome work. For this reason, intake pipe, etc.
Can be easily manufactured.
【００２３】射出空間８内に注入した合成樹脂が固化し
たならば、上型９を下型１０から離隔させ、中子１１が
内包されたままの吸気管等を取り出す。そして、高周波
誘導加熱法等、従来から知られた方法により、中子１１
を加温する。これにより、上記中子１１のみを溶解さ
せ、合成樹脂製の吸気管等の内側から除去する。When the synthetic resin injected into the injection space 8 is solidified, the upper die 9 is separated from the lower die 10 and the intake pipe or the like in which the core 11 is contained is taken out. Then, the core 11 is formed by a conventionally known method such as a high-frequency induction heating method.
Warm. As a result, only the core 11 is dissolved and removed from the inside of the intake pipe or the like made of synthetic resin.
【００２４】[0024]
【００２５】[0025]
【００２６】次に、図７（Ａ）、（Ｂ）は、それぞれ本
発明の第二、第三実施例を示している。図７（Ａ）に示
した第二実施例に於いては、中子１１に、前記第一実施
例と同様の巾木部１５を設けると共に、この巾基部１５
の上面に、下型１０の長さ方向（図７（Ａ）の表裏方
向）に長い係止板２３を載置し、この係止板２３を上下
両型９、１０の間で挟持する。上記巾木部１５と係止板
２３と上型９の第二の合わせ面１３とが、抜け止め手段
を構成する。その他の構成並びに作用は、前述した第一
実施例と同様である。 Next, FIGS. 7A and 7B respectively show the book
7 shows second and third embodiments of the invention. It is In a second embodiment shown in FIG. 7 (A), the core 11, provided with the first embodiment and the same core print section 15, the width base portion 15
A long locking plate 23 is placed on the upper surface of the lower die 10 in the length direction of the lower die 10 (the front and back direction in FIG. 7A), and the locking plate 23 is sandwiched between the upper and lower dies 9 and 10. The baseboard portion 15, the locking plate 23, and the second mating surface 13 of the upper die 9 constitute retaining means. Other configurations and operations are the same as those of the first embodiment.
【００２７】更に、図７（Ｂ）に示した第三実施例に於
いては、中子１１に、下型１０の幅方向（図７（Ｂ）の
左右方向）に突出させた巾木部１５ａを設けている。そ
して、この巾木部１５ａの一側（図７（Ｂ）の左側）上
面に、係止板２３を載置し、この係止板２３を上下両型
９、１０の間で挟持する。上記巾木部１５ａと係止板２
３と上型９の第二の合わせ面１３とが、抜け止め手段を
構成する。その他の構成並びに作用は、前述した第一実
施例と同様である。尚、上述の図７（Ａ）（Ｂ）に示し
た第二、第三実施例の場合には、前述の図１〜６に示し
た第一実施例の場合と異なり、上、下型９、１０に中子
１１を設置する際に、巾木部１５、１５ａと上型９との
間で係止板２３を挟持させる必要がある。但し、この係
止板２３を挟持させる作業では、厳密な位置合わせを必
要としない。この為、下型１０の一部に挿通させたピン
の一部や、この中子１１とは別の部材に固設したピン
を、 この中子１１の一端に設けた凹部に挿入する事によ
り、下型１０に設けた凹孔１７から中子１１の一端が抜
け出るのを防止する場合に比べて、給気管等の製造作業
を容易に行なえる。 Further, in the third embodiment shown in FIG. 7 ( B ), the core 11 has a baseboard portion protruding in the width direction of the lower die 10 (the left-right direction in FIG. 7 ( B )). 15a is provided. Then, the locking plate 23 is placed on the upper surface of one side (the left side in FIG. 7 ( B )) of the baseboard portion 15a, and the locking plate 23 is sandwiched between the upper and lower dies 9, 10. The baseboard 15a and the locking plate 2
The 3 and the second mating surface 13 of the upper mold 9 constitute retaining means. Other configurations and operations are the same as those of the first embodiment. It should be noted that FIG. 7A and FIG.
In the case of the second and third embodiments,
Unlike the case of the first embodiment, the upper and lower dies 9, 10 are provided with cores.
When installing 11, the baseboards 15 and 15a
It is necessary to hold the locking plate 23 between them. However, this
In the work of holding the stop plate 23, strict alignment is required.
No need. For this reason, a pin inserted through a part of the lower mold 10
And a pin fixed to a member other than the core 11
A, to be inserted into a recess provided in one end of the core 11
And one end of the core 11 is pulled out of the concave hole 17 provided in the lower mold 10.
Manufacturing work for air supply pipes, etc.
Can be easily performed.
【００２８】尚、上述した各実施例に於いては、本発明
を自動車用エンジンのシリンダに空気を送る為の吸気管
や吸気マニホールドを製造するのに適用した例に就いて
説明したが、本発明の製造方法は、これに限定されるも
のではなく、総ての合成樹脂製の管状部材を製造するの
に適用出来る。In each of the embodiments described above, an example in which the present invention is applied to manufacture an intake pipe or an intake manifold for sending air to a cylinder of an automobile engine has been described. The manufacturing method of the present invention is not limited to this, and can be applied to manufacture all synthetic resin tubular members.
【００２９】[0029]
【発明の効果】本発明に係る合成樹脂製管状部材の製造
方法は、上述の様に構成する為、合成樹脂の射出時に中
子が移動する事が防止される。この結果、製造された合
成樹脂製管状部材は、肉厚が均一になる。又、肉厚が均
一になる事に伴なって、局部的な強度低下がなくなり、
耐久性が向上する。又、合成樹脂製管状部材の製造作業
の容易化を図れる為、この合成樹脂製管状部材の製造コ
ストの低減を図れる。 The method for manufacturing a synthetic resin tubular member according to the present invention is configured as described above, so that the core is prevented from moving during injection of the synthetic resin. As a result, the thickness of the manufactured synthetic resin tubular member becomes uniform. Also, with the uniform thickness, there is no local decrease in strength,
The durability is improved. In addition, manufacturing work of synthetic resin tubular members
The production cost of this synthetic resin tubular member is
The strike can be reduced.
【図１】本発明の第一実施例を示す、中子の斜視図。FIG. 1 is a perspective view of a core showing a first embodiment of the present invention.
【図２】中子を下型に装着した状態を示す平面図。FIG. 2 is a plan view showing a state in which a core is mounted on a lower die.
【図３】同縦断側面図。FIG. 3 is a vertical sectional side view of the same.
【図４】上型を下型に重ね合わせる状態を示す、縦断側
面図。FIG. 4 is a longitudinal sectional side view showing a state in which an upper mold is overlapped with a lower mold.
【図５】上型と下型とを完全に重ね合わせた状態を示
す、縦断側面図。FIG. 5 is a longitudinal sectional side view showing a state in which an upper mold and a lower mold are completely overlapped.
【図６】図５のＡ−Ａ断面図。FIG. 6 is a sectional view taken along line AA of FIG. 5;
【図７】本発明の第二、第三実施例をそれぞれ示す、図
５のＢ部に相当する図。FIG. 7 is a view showing a second and a third embodiment of the present invention and corresponds to a portion B in FIG. 5;
【図８】従来の中子を示す斜視図。FIG. 8 is a perspective view showing a conventional core.
【図９】中子を成形型に装着した状態を示す、縦断側面
図。FIG. 9 is a longitudinal sectional side view showing a state where the core is mounted on a molding die.
【図１０】中子が移動した状態を示す、図９と同様の
図。FIG. 10 is a view similar to FIG. 9, showing a state in which the core has moved.
１ 中子 ２ 上型 ３ 下型 ４ 第一の合わせ面 ５ 凹孔 ６ 第二の合わせ面 ７ 中空部 ８ 射出空間 ８ａ 上側部分 ８ｂ 下側部分 ９ 上型 １０ 下型 １１ 中子 １２ 第一の合わせ面 １３ 第二の合わせ面 １４ 中空部 １５、１５ａ 巾木部 １６ 小凹部 １７ 凹孔 １８ 係止凹部 １９ 係止片 ２０ 凹溝 ２１ 係止凹部 ２２ａ、２２ｂ 係止板 ２３ 係止板 DESCRIPTION OF SYMBOLS 1 Core 2 Upper die 3 Lower die 4 First mating surface 5 Concave hole 6 Second mating surface 7 Hollow part 8 Injection space 8a Upper part 8b Lower part 9 Upper die 10 Lower die 11 Core 12 First Mating surface 13 second mating surface 14 hollow portion 15, 15 a baseboard portion 16 small concave portion 17 concave hole 18 locking concave portion 19 locking piece 20 concave groove 21 locking concave portion 22a, 22b locking plate 23 locking plate
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ // Ｂ２９Ｋ 77:00 Ｂ２９Ｋ 77:00 105:06 105:06 Ｂ２９Ｌ 23:00 Ｂ２９Ｌ 23:00 31:30 31:30 (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 33/00 - 33/76 B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI // B29K 77:00 B29K 77:00 105: 06 105: 06 B29L 23:00 B29L 23:00 31:30 31:30 (58 ) Surveyed field (Int.Cl. 7 , DB name) B29C 33/00-33/76 B29C 45/00-45/84
Claims (1)
の第一の合わせ面と密接する第二の合わせ面を有する第
二の型と、これら第一、第二の合わせ面同士を密接した
状態で、両合わせ面同士の間に設けられる射出空間と、
低融点合金により造られた中子とを用い、この中子の一
端を上記第一の型に形成した凹孔内に挿入すると共に、
上記中子の他端を上記第一、第二の型同士の間で挟持す
る事により、上記中子を上記射出空間の断面中央部に位
置させた状態で、上記射出空間内に加熱溶融した熱可塑
性合成樹脂を注入する、合成樹脂製管状部材の製造方法
に於いて、上記中子の一端に一体鋳造により結合する状
態で設けられた巾木部を、上記第一の型に形成した凹孔
内に挿入した状態で、この巾木部を、この第一の型と上
記第二の型との間で、直接又は別の部材を介して挟持す
る事により、上記中子の一端が上記凹孔から抜け出るの
を防止する抜け止め手段を構成する事を特徴とする、合
成樹脂製管状部材の製造方法。1. A first mold having a first mating surface, a second mold having a second mating surface in close contact with the first mating surface, and a first and a second mating surface. In an intimate state, an emission space provided between both mating surfaces,
Using a core made of a low melting point alloy, while inserting one end of this core into the recess formed in the first mold,
By sandwiching the other end of the core between the first and second molds, the core was heated and melted in the injection space while being positioned at the center of the cross section of the injection space. In a method of manufacturing a synthetic resin tubular member in which a thermoplastic synthetic resin is injected, a state in which the core is joined to one end of the core by integral casting.
The baseboard part provided in the state, the concave hole formed in the first mold
Insert the baseboard into the first mold
Between the second mold directly or via another member
By that, one end of the core is characterized by constituting a retaining means for preventing the coming off from the recessed hole, the manufacturing method of the synthetic resin tubular member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15820593A JP3325340B2 (en) | 1993-06-04 | 1993-06-04 | Method for manufacturing synthetic resin tubular member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15820593A JP3325340B2 (en) | 1993-06-04 | 1993-06-04 | Method for manufacturing synthetic resin tubular member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06344394A JPH06344394A (en) | 1994-12-20 |
| JP3325340B2 true JP3325340B2 (en) | 2002-09-17 |
Family
ID=15666586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15820593A Expired - Fee Related JP3325340B2 (en) | 1993-06-04 | 1993-06-04 | Method for manufacturing synthetic resin tubular member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3325340B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012142103A2 (en) * | 2011-04-11 | 2012-10-18 | Trelleborg Automotive Usa, Inc. | Method of producing split outer shell cradle mount with rate plates |
| CN114179259A (en) * | 2021-12-09 | 2022-03-15 | 上海中核八所科技有限公司 | RTM (resin transfer molding) forming die and process for composite material with right-angle tubular tee joint structure |
-
1993
- 1993-06-04 JP JP15820593A patent/JP3325340B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06344394A (en) | 1994-12-20 |
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