JPH0374610B2 - - Google Patents
Info
- Publication number
- JPH0374610B2 JPH0374610B2 JP17943484A JP17943484A JPH0374610B2 JP H0374610 B2 JPH0374610 B2 JP H0374610B2 JP 17943484 A JP17943484 A JP 17943484A JP 17943484 A JP17943484 A JP 17943484A JP H0374610 B2 JPH0374610 B2 JP H0374610B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- core pin
- mold
- fixed mold
- recess
- 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
Links
- 238000000465 moulding Methods 0.000 claims description 41
- 239000012768 molten material Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000003780 insertion Methods 0.000 description 12
- 230000037431 insertion Effects 0.000 description 12
- 239000000047 product Substances 0.000 description 11
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000012778 molding material Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000289 melt material 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- 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
- B29C45/26—Moulds
- B29C45/36—Moulds having means for locating or centering cores
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C2045/5695—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding using a movable mould part for continuously increasing the volume of the mould cavity to its final dimension during the whole injection step
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は例えば光フアイバプラスチツクコネク
タ（以下光コネクタと称す）のフエルールを成形
する際に用いる成形金型に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a molding die used, for example, in molding a ferrule of an optical fiber plastic connector (hereinafter referred to as an optical connector).
従来光コネクタの一例として第３図に示すよう
に、光フアイバ心線１が挿入される穴２と、光フ
アイバ素線３が挿入される例えば125μｍの微小
穴４を有するフエルール５と、このフエルール５
の外周に設けられるスリーブ６と、このスリーブ
６と上記フエルール５とを結合する袋ナツト７と
によつて構成されている。
As shown in FIG. 3 as an example of a conventional optical connector, a ferrule 5 has a hole 2 into which a cored optical fiber 1 is inserted, a microhole 4 of, for example, 125 μm into which an optical fiber 3 is inserted, and this ferrule. 5
The ferrule 5 is made up of a sleeve 6 provided on the outer periphery of the ferrule 5, and a cap nut 7 that connects the sleeve 6 to the ferrule 5.
上記フエルール５は第４図に示すように固定金
型１０と可動金型２０とから構成されている。固
定金型１０は、成形用樹脂注入口１１とガイド穴
１２とコアピン挿入穴１３を有する固定金型本体
１４と、この固定金型本体１４のコアピン挿入穴
１３に挿入固着され、かつ微小ピン挿入穴１６を
有するコアピン１５とからなつている。可動金型
２０は、フエルール５の外側形状を設定するため
の穴２１およびガイドピン２４を有する可動金型
本体２２と、この可動金型本体２２の穴２１の底
部に設けられたキヤビテイ入れ駒（微小ピンホル
ダ）２３と、このキヤビテイ入れ駒２３に植立さ
れ上記コアピン１５の微小ピン挿入穴１６に挿入
可能な微小ピン２５とからなつている。 The ferrule 5 is composed of a fixed mold 10 and a movable mold 20, as shown in FIG. The fixed mold 10 includes a fixed mold main body 14 having a molding resin injection port 11, a guide hole 12, and a core pin insertion hole 13, and is inserted and fixed into the core pin insertion hole 13 of the fixed mold main body 14, and has a micro pin insertion hole. It consists of a core pin 15 having a hole 16. The movable mold 20 includes a movable mold main body 22 having a hole 21 and a guide pin 24 for setting the outer shape of the ferrule 5, and a cavity insertion piece ( It consists of a micro pin holder) 23 and a micro pin 25 which is set in this cavity insertion piece 23 and can be inserted into the micro pin insertion hole 16 of the core pin 15.
このような構成の成形金型を用いて成形するに
は、固定金型１０と可動金型２０を第５図のよう
に組合せ、これを成形機にセツトし、このシリン
ダから溶融樹脂３０を上記成形用樹脂注入口１１
に対して注入すればよい。このようにすることに
より、樹脂３０は可動金型本体２２の穴２１とコ
アピン１５とによつて形成されるキヤビテイの上
部から下部に徐々に注入され、最後に微小ピン２
５近くに樹脂３０は注入される。この微小ピン２
５近くに注入された樹脂３０は、上記シリンダの
先端に長く滞留したものであるため、劣化が進み
分子量等の物性値が低下している。しかもキヤビ
テイ内の空気、樹脂３０から発生するガス等の気
泡分が逃げ場を失ない、微小ピン２５の近傍に固
定されたまま樹脂３０の冷却が起こり、最終的に
製品であるフエルール５の最も重要な先端部分の
微***径およびこの部分の外形寸法のバラツキ、
さらには外形面の粗さを生じる原因にもなる。ま
た、分流された樹脂の流れの合流でできるウエル
ドラインがフエルール５の先端部にできることか
ら機械的強度を低下させる一因となる。 In order to perform molding using a molding die having such a configuration, the fixed die 10 and the movable die 20 are combined as shown in FIG. Molding resin injection port 11
You can inject it into. By doing this, the resin 30 is gradually injected from the upper part to the lower part of the cavity formed by the hole 21 of the movable mold body 22 and the core pin 15, and finally
The resin 30 is injected near 5. This minute pin 2
Since the resin 30 injected near the cylinder 5 remains at the tip of the cylinder for a long time, its deterioration progresses and physical property values such as molecular weight decrease. Moreover, the air inside the cavity and the gas bubbles generated from the resin 30 have no place to escape, and the resin 30 is cooled while being fixed near the micro pin 25, which is the most important part of the final product, the ferrule 5. Variations in the microhole diameter of the tip and the external dimensions of this part,
Furthermore, it also causes roughness of the external surface. Furthermore, a weld line is formed at the tip of the ferrule 5 due to the convergence of the separated resin flows, which causes a decrease in mechanical strength.
本発明は上記事情に基いてなされたもので、成
形製品の微***径およびこの部分の外形寸法のバ
ラツキを少なくでき、しかも成形製品の先端部の
外形面の粗さが少なくかつ先端部の機械的強度の
低下を防止できる成形金型を提供することを目的
とする。
The present invention has been made based on the above-mentioned circumstances, and it is possible to reduce variations in the microhole diameter of a molded product and the external dimensions of this part, and to reduce the roughness of the external surface of the tip of the molded product. The purpose of the present invention is to provide a molding die that can prevent a decrease in mechanical strength.
以下、本発明について図面を参照して説明す
る。ここでは、光コネクタのフエルールを成形す
るために用いる成形金型を例にあげて説明する
が、これに限らず他の製品を成形するためのもの
であつてもよい。第１図は本発明の成形金型の一
実施例を示す断面図で、これは固定金型４０と可
動金型５０で構成されている。固定金型４０は成
形用溶融材の注入口４１、ガイド穴４２およびコ
アピン挿入穴４３を有する固定金型本体４４と、
コアピン４５とからなつている。
Hereinafter, the present invention will be explained with reference to the drawings. Here, a molding die used for molding a ferrule of an optical connector will be described as an example, but the molding die is not limited to this and may be used for molding other products. FIG. 1 is a sectional view showing one embodiment of the molding die of the present invention, which is composed of a fixed mold 40 and a movable mold 50. The fixed mold 40 includes a fixed mold body 44 having an injection port 41 for a molten material for molding, a guide hole 42, and a core pin insertion hole 43;
It consists of a core pin 45.
このコアピン４５は棒状であつて、一端にフラ
ンジ４５ａが形成され、他端面に軸方向のくぼみ
４５ｂが形成されている。このような構成のコア
ピン４５は、上記固定金型本体４４のコアピン挿
入穴４３に、スライド（上下動）可能に挿入さ
れ、上記フランジ４５ｂにより支持されている。 This core pin 45 is rod-shaped and has a flange 45a formed at one end and an axial recess 45b formed at the other end. The core pin 45 having such a structure is slidably (vertically movable) inserted into the core pin insertion hole 43 of the fixed mold body 44 and supported by the flange 45b.
可動金型５０は上端部にガイドピン５１を有
し、中心部に製品の外側形状を設定するための貫
通穴５２を有する可動金型本体５３と、この可動
金型本体５３の貫通穴５２の底部に設けられるキ
ヤビテイ入れ駒（微小ピンホルダ）５４と、この
キヤビテイ入れ駒５４に支持される微小ピン５５
とからなつている。 The movable mold 50 has a guide pin 51 at the upper end, a movable mold main body 53 having a through hole 52 in the center for setting the outer shape of the product, and a movable mold main body 53 having a through hole 52 in the center thereof. A cavity insertion piece (micro pin holder) 54 provided at the bottom and a micro pin 55 supported by this cavity insertion piece 54.
It is made up of.
このように構成された固定金型40と可動金型５
０を第１図のように組合せ、これを成形機にセツ
トし、このシリンダから成形用溶融材６０を上記
注入口４１に注入する。すると、成形用溶融材６
０は最初貫通穴５２とコアピン４５とによつて形
成されるキヤビテイを流れてキヤビテイ底部に到
達する。キヤビテイ底部に到達した成形用溶融材
６０は逃げ場を失ない、キヤビテイ底部とコアピ
ン４５の先端とのすきまを通り、コアピン４５の
くぼみ４５ｂの内部に入り、このくぼみ４５ｂの
底部に最終的に入る。 Fixed mold 40 and movable mold 5 configured in this way
0 are assembled as shown in FIG. 1, this is set in a molding machine, and the molten material 60 for molding is injected into the injection port 41 from this cylinder. Then, the molten material for molding 6
0 first flows through the cavity formed by the through hole 52 and the core pin 45 and reaches the bottom of the cavity. The molten material 60 for molding that has reached the bottom of the cavity has no place to escape, passes through the gap between the bottom of the cavity and the tip of the core pin 45, enters the inside of the recess 45b of the core pin 45, and finally enters the bottom of the recess 45b.
この場合くぼみ４５ｂ特にこの底部に入つた成
形用溶融材６０は、上記シリンダの内部に長く滞
留したものであるため、劣化が進み、分子量等の
物性値が低下しているが、キヤビテイ底部の微小
ピン５５の突出している部分つまり製品、すなわ
ちフエルール５の先端部となる部分は、成形用溶
融材６０は劣化が少なく、分子量等の物性値の低
下も少ない。従つて、製品すなわちフエルール５
の先端部の微***径のバラツキおよびこの部分の
外形寸法のバラツキが少なくなり、しかもフエル
ール５の先端部の外形面の粗さが少なくなる。ま
た注入口４１から注入される成形溶融材６０の合
流でできるウエルドラインはフエルール５の先端
部に形成されないので、機械的強度の低下を防止
できる。 In this case, the molten molding material 60 that has entered the cavity 45b, especially the bottom, has remained inside the cylinder for a long time, so it has progressed to deteriorate and its physical properties such as molecular weight have decreased. In the part where the pin 55 protrudes, that is, the part that becomes the tip of the ferrule 5, the molten material 60 for molding is less likely to deteriorate and its physical properties such as molecular weight are less likely to decrease. Therefore, the product i.e. ferrule 5
The variation in the microhole diameter at the tip of the ferrule 5 and the variation in the external dimensions of this portion are reduced, and the roughness of the external surface of the tip of the ferrule 5 is also reduced. Further, since a weld line formed by the merging of the molding melt material 60 injected from the injection port 41 is not formed at the tip of the ferrule 5, a decrease in mechanical strength can be prevented.
しかして第１図の状態において、上記シリンダ
から成形用溶融材６０をさらに注入口４１に注入
することにより、成形用溶融材６０は上記と同様
にキヤビテイを流れ、キヤビテイ底部からコアピ
ン４５のくぼみ４５ｂに入り、成形用溶融材６０
の逃げ場がなくなり、成形用溶融材６０の圧力に
より、コアピン４５上方に押し上げられ、第２図
のようになり、この動作が連続的に行われる。 In the state shown in FIG. 1, by further injecting the molten material 60 for molding from the cylinder into the injection port 41, the molten material 60 flows through the cavity in the same manner as described above, and enters the depression 45b of the core pin 45 from the bottom of the cavity. molten material for molding 60
There is no place to escape, and the pressure of the molten molding material 60 pushes the core pin 45 upward, as shown in FIG. 2, and this operation is performed continuously.
このようにコアピン４５が成形用溶融材６０の
圧力によつて上方に押し上げられるので、最終点
に製品例えばフエルールで問題となる成形用溶融
材６０のうちシリンダ内部に長く滞留した成形用
溶融材６０はキヤビテイ底部（微小ピン５５の突
出部）からさらに遠くに流れるので、製品の微小
穴径のバラツキおよびこの部分の外形寸法のバラ
ツキがさらに少なくなり、しかも製品の先端部の
外形面の粗さがさらに少なくなる。 As the core pin 45 is pushed upward by the pressure of the molten material 60, at the final point, the molten material 60 that has remained inside the cylinder for a long time becomes a problem in products such as ferrules. Flows further away from the bottom of the cavity (the protruding part of the micro pin 55), which further reduces the variation in the micro hole diameter of the product and the variation in the external dimensions of this part, and further reduces the roughness of the external surface at the tip of the product. Even less.
なお、以上述べた実施例では固定金型４０の成
形用溶融材６０の注入口４１は可動金型本体５３
に形成せず固定金型本体４４に形成してあるの
は、キヤビテイ内でできる製品例えばフエルール
５の寸法精度があまり要求されない部分（具体的
にはフランジ部）であるので、製品を成形金型か
ら取出した後の処理が容易に行えるようにするた
めである。 In the embodiment described above, the injection port 41 for the molten material 60 for molding of the fixed mold 40 is connected to the movable mold main body 53.
The parts that are not formed in the mold body 44 but are formed in the mold body 44 are parts that do not require high dimensional accuracy (specifically, the flange part) of a product that can be formed within the cavity, such as the ferrule 5, so the product is not formed in the molding mold. This is to facilitate processing after taking it out.
以上述べた本発明によれば、成形金型の微***
径およびこの部分の外形寸法のバラツキを少なく
でき、しかも成形製品の先端部の外形面の粗さが
少なくなり、また成形製品の先端部の機械的強度
の低下を防止できる成形金型を提供できる。
According to the present invention described above, it is possible to reduce variations in the microhole diameter of the molding die and the external dimensions of this part, and to reduce the roughness of the external surface of the tip of the molded product. It is possible to provide a molding die that can prevent a decrease in mechanical strength.
第１図と第２図はいずれも本発明による成形金
型の一実施例の断面図であつて、第１図は成形初
期の状態を示す図、第２図は成形途中の状態を示
す図、第３図は光コネクタの概略構成を示す断面
図、第４図および第５図は第３図のフエルールを
製作するための従来の成形金型の一例を示す断面
図であつて、第４図は成形前の状態を示す図、第
５図は成形後の状態を示す図である。
４０……固定金型、４１……注入口、４２……
ガイド穴、４３……コアピン挿入穴、４４……固
定金型本体、４５……コアピン、４５ａ……フラ
ンジ、４５ｂ……くぼみ、５０……可動金型、５
１……ガイドピン、５２……貫通穴、５３……可
動金型本体、５４……キヤビテイ入れ駒（微小ピ
ンホルダ）、５５……微小ピン。
1 and 2 are both cross-sectional views of an embodiment of a molding die according to the present invention, with FIG. 1 showing a state in the initial stage of molding, and FIG. 2 showing a state in the middle of molding. , FIG. 3 is a sectional view showing a schematic configuration of an optical connector, and FIGS. 4 and 5 are sectional views showing an example of a conventional molding die for manufacturing the ferrule shown in FIG. The figure shows the state before molding, and FIG. 5 shows the state after molding. 40...Fixed mold, 41...Injection port, 42...
Guide hole, 43... Core pin insertion hole, 44... Fixed mold body, 45... Core pin, 45a... Flange, 45b... Hollow, 50... Movable mold, 5
1...Guide pin, 52...Through hole, 53...Movable mold body, 54...Cavity insertion piece (micro pin holder), 55...Minute pin.
Claims (1)
し、上記固定金型本体に製品の内側形状を設定す
るためのコアピンを設けた固定金型と、この固定
金型に組合せた状態で可動金型本体に、上記コア
ピンが挿入されるとともに、製品の外側形状を設
定するための穴を形成した可動金型とからなる成
形金型において、上記コアピンの端面にくぼみを
形成し、このくぼみには成形最終段階で、上記固
定金型の注入口からの成形用溶融材がくぼみの周
囲から流れ込むようにした成形金型。 ２ 固定金型本体に成形用溶融材の注入口を形成
し、上記固定金型本体に製品の内側形状を設定す
るためのコアピンを設けた固定金型と、この固定
金型に組合せた状態で可動金型本体に、上記コア
ピンが挿入されるとともに、製品の外側形状を設
定するための穴を形成した可動金型とからなる成
形金型において、上記コアピンの端面にくぼみを
形成し、しかも上記コアピンを上記固定金型本体
にスライド可能に設け、成形時上記くぼみにこの
周囲から流れ込む上記成形用溶融材の圧力により
上記コアピンを順次上方にスライドさせるように
した成形金型。[Scope of Claims] 1. A fixed mold in which an injection port for a molten material for molding is formed in a fixed mold body, and a core pin for setting the inner shape of a product in the fixed mold body, and this fixed mold. In a molding mold consisting of a movable mold in which the core pin is inserted into a movable mold main body in a state in which the core pin is assembled in a mold, and a hole is formed for setting the outer shape of the product, a recess is formed in the end surface of the core pin. A molding mold having a recess formed in the recess, in which the molten material for molding from the injection port of the fixed mold flows from around the recess in the final stage of molding. 2 A fixed mold in which an injection port for the molten material for molding is formed in the fixed mold body, and a core pin for setting the inner shape of the product is provided in the fixed mold body, and the fixed mold is combined with this fixed mold. In a molding mold consisting of a movable mold body into which the core pin is inserted and a movable mold in which a hole is formed for setting the outer shape of the product, a recess is formed in the end face of the core pin, and the core pin is inserted into the movable mold body. A molding die in which a core pin is slidably provided in the stationary mold body, and the core pin is sequentially slid upward by the pressure of the molten material for molding that flows into the recess from the periphery during molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17943484A JPS6157316A (en) | 1984-08-30 | 1984-08-30 | Molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17943484A JPS6157316A (en) | 1984-08-30 | 1984-08-30 | Molding die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6157316A JPS6157316A (en) | 1986-03-24 |
| JPH0374610B2 true JPH0374610B2 (en) | 1991-11-27 |
Family
ID=16065794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17943484A Granted JPS6157316A (en) | 1984-08-30 | 1984-08-30 | Molding die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6157316A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018112334B4 (en) * | 2018-05-23 | 2022-03-03 | Leoni Kabel Gmbh | Apparatus for molding an elongate member |
-
1984
- 1984-08-30 JP JP17943484A patent/JPS6157316A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6157316A (en) | 1986-03-24 |
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