JPH0722945B2 - Injection molded parts and their molds - Google Patents
Injection molded parts and their moldsInfo
- Publication number
- JPH0722945B2 JPH0722945B2 JP2149613A JP14961390A JPH0722945B2 JP H0722945 B2 JPH0722945 B2 JP H0722945B2 JP 2149613 A JP2149613 A JP 2149613A JP 14961390 A JP14961390 A JP 14961390A JP H0722945 B2 JPH0722945 B2 JP H0722945B2
- Authority
- JP
- Japan
- Prior art keywords
- core pin
- mold
- diameter
- ejector sleeve
- hole
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/303—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting
- B29C33/304—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting 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
- B29C45/26—Moulds
- B29C45/36—Moulds having means for locating or centering cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Coupling Of Light Guides (AREA)
- Moulds For Moulding 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、細い貫通孔を有する円筒形状の成形体および
その射出成形金型に関するものであり、その成形体は光
通信等に適用される光コネクタに光ファイバーをガイド
するフェルールに好適であり、これら円筒形状の成形部
品の製造に関するものである。Description: TECHNICAL FIELD The present invention relates to a cylindrical molded body having a narrow through hole and an injection molding die thereof, and the molded body is applied to optical communication and the like. It is suitable for a ferrule that guides an optical fiber to an optical connector, and relates to manufacturing of these cylindrical molded parts.
本発明は、比較的細長い円筒形状の中心部に0.2mm径以
下の貫通孔を形成する為に、エジェクタースリーブの先
端に円錐状の凹部案内を設け、固定側に保持されたコア
ピンを挿入し、一端の保持部とする。コアピンが細い
為、溶融材料の流入に応動してエジェクタースリーブを
後退させるようにし、コアピンが変形しないようにし
た。The present invention, in order to form a through hole having a diameter of 0.2 mm or less in the center of a relatively elongated cylindrical shape, a conical recess guide is provided at the tip of the ejector sleeve, and the core pin held on the fixed side is inserted. It is a holding part at one end. Since the core pin is thin, the ejector sleeve is made to retract in response to the inflow of the molten material so that the core pin is not deformed.
従来、このような細径を有する円筒成形体のフェルール
は、第２図の断面図に示すように円筒体の軸方向と平行
なパーティングライン17で金型を分割構成し、このパー
ティングライン面で細径のコアピン15を保持し成形して
いた。Conventionally, in a ferrule of a cylindrical molded body having such a small diameter, as shown in the sectional view of FIG. 2, a mold is divided and configured by a parting line 17 parallel to the axial direction of the cylindrical body. The core pin 15 having a small diameter was held by the surface and molded.
従来の方法によると、円筒体の側面に軸方向の平行なパ
ーティングラインのバリが発生し、後加工で除く工程が
必要である。また、型開きとは別に細径コアピンを成形
体から抜き取る操作が必要であり、外部機構が煩雑とな
り極めて量産性が低下する。さらに、型の構造からその
加工精度がでず、円筒成形体の内径と外径の軸ズレ等が
生じ易いという欠点を有していた。According to the conventional method, burrs of parting lines parallel to the axial direction are generated on the side surface of the cylindrical body, and a step of removing by post-processing is required. In addition to the opening of the mold, it is necessary to pull out the small-diameter core pin from the molded body, which complicates the external mechanism and significantly deteriorates mass productivity. Further, there is a defect that the processing accuracy cannot be obtained due to the structure of the mold, and axial deviation between the inner diameter and the outer diameter of the cylindrical molded body easily occurs.
上記課題を解決する為に、本発明は円筒成形体を成形す
るキャビティーを、その軸方向が型開き方向と平行にな
るようにしたもので、すなわち0.2mm径以下の穴を有す
る円筒成形体を射出成形する可動金型と固定金型による
ものにおいて、その穴を形成する為の細径コアピンを収
めるエジェクタスリーブ式構造で、コアピンを保持する
部分が固定金型に有り、固定金型のパーティング面より
突出する円錐状の先端にコアピンが保持され、エジェク
タスリーブの先端には、円錐状の凹部案内が設けてあ
り、エジェクタスリーブは、型締め状態でコアピンを保
持する円錐状の突出部と円錐状の凹部が当接することに
よりゲート深さだけ押されて初期流入空間を構成し、溶
融材料の流入によりエジェクタスリーブを後退させて成
形するものである。In order to solve the above problems, the present invention is a cavity for molding a cylindrical molded body, the axial direction of which is parallel to the mold opening direction, that is, a cylindrical molded body having a hole of 0.2 mm diameter or less. In the case of a movable mold for injection molding and a fixed mold, it has an ejector sleeve type structure that accommodates a small diameter core pin for forming the hole, and the part holding the core pin is in the fixed mold, The core pin is held at the conical tip protruding from the ring surface, and the conical recess guide is provided at the tip of the ejector sleeve.The ejector sleeve has a conical protrusion that holds the core pin in the mold clamped state. When the conical concave portion abuts, it is pushed by the depth of the gate to form an initial inflow space, and the ejector sleeve is retracted and shaped by the inflow of the molten material.
上記型構造によれば、細径コアピンの一端のエジェクタ
スリーブへの挿入が、細径コアピンの変形及び座屈する
ことなく行え、溶融材料の流入に応動したエジェクタス
リーブの後退により、細径コアピンへの変形応力が加わ
らず、外径を基準とした内径の穴曲がりがなく、内径と
外径の軸ズレの少ないフェルールが得られる。According to the mold structure, one end of the small diameter core pin can be inserted into the ejector sleeve without deformation and buckling of the small diameter core pin, and the ejector sleeve retracts in response to the inflow of the molten material, so that the small diameter core pin It is possible to obtain a ferrule in which no deformation stress is applied, there is no bending of the inner diameter with respect to the outer diameter, and there is little axial deviation between the inner diameter and the outer diameter.
以下に、本発明の実施例を図面に基づき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本発明に係る円筒状の成形体とは、その中心に0.2mmφ
以下の細穴を備え、その円筒の肉厚は中心穴径以上で、
かつ円筒の長さは中心穴径の10倍以上と比較的長い穴を
備えた形状を規定するもので、その好適な実施例は、光
コネクタに用いるフェルールである。The cylindrical molded body according to the present invention has a center of 0.2 mmφ
Equipped with the following small holes, the thickness of the cylinder is more than the center hole diameter,
Moreover, the length of the cylinder defines a shape having a relatively long hole having a diameter of 10 times or more the center hole diameter, and a preferred embodiment thereof is a ferrule used for an optical connector.
（実施例１） 第１図は、本発明の実施例を示す金型の断面図である。
第１図ａは、型開き及び突き出し状態、第１図ｂは、型
締め状態、第１図ｃは、材料射出開始状態、第１図ｄ
は、材料充填完了時の断面をしめす。型開き及び突き出
し状態（第１図ａ）では、バネ体５によりエジェクタス
リーブ２の先端は金型のパーティングライン９より固定
側に突き出ている。コアピン３はエジェクタスリーブ２
の軸と平行に固定側６の円錐状の突出部７で保持されて
いる。型締め開始と共に、エジェクタスリーブ２の先端
に形成された円錐状の凹部８にガイドされてコアピン３
がエジェクタスリーブ２に挿入され、円錐状の突出部７
によりエジェクタスリーブ２が押され始める。型締めが
終了すると、エジェクタスリーブ２の先端は円錐状の突
出部７により、ゲート４の深さと等しくパーティングラ
イン９より可動側10へ入りこんで溶融材料の初期流入の
ための空間となっている（第１図ｂ）。ついで、溶融材
料がゲート４を通ってキャビティー１へ流入すると、そ
の圧力によりエジェクタスリーブ２を押していたバネ体
５が縮み充填が開始される（第１図ｃ）。溶融材料は、
ゲート４近傍で充填された後、エジェクタスリーブ２及
びコアピン３の軸方向と平行に進む為、コアピン３に曲
げ応力が加わる事なしに充填が終了する（第１図ｄ）。(Embodiment 1) FIG. 1 is a sectional view of a mold showing an embodiment of the present invention.
1a is a mold opening and protruding state, FIG. 1b is a mold clamping state, FIG. 1c is a material injection starting state, and FIG.
Shows the cross section when the material filling is completed. In the mold open and projecting state (Fig. 1a), the tip of the ejector sleeve 2 is projected by the spring body 5 from the parting line 9 of the mold to the fixed side. The core pin 3 is the ejector sleeve 2
It is held by a conical protrusion 7 on the fixed side 6 parallel to the axis of. When the mold clamping is started, the core pin 3 is guided by the conical recess 8 formed at the tip of the ejector sleeve 2.
Is inserted into the ejector sleeve 2 and the conical protrusion 7
Thus, the ejector sleeve 2 starts to be pushed. When the mold clamping is completed, the tip of the ejector sleeve 2 is equal to the depth of the gate 4 by the conical projection 7 and enters the movable side 10 from the parting line 9 to provide a space for the initial inflow of the molten material. (Fig. 1b). Then, when the molten material flows into the cavity 1 through the gate 4, the pressure thereof causes the spring body 5 pushing the ejector sleeve 2 to shrink and start filling (FIG. 1c). The molten material is
After being filled in the vicinity of the gate 4, the filling progresses in parallel with the axial direction of the ejector sleeve 2 and the core pin 3, so that the filling is completed without applying bending stress to the core pin 3 (Fig. 1d).
（実施例２） 第３図は、本発明の実施例を示す金型の断面図である。
第３図ａは、型開き及び突き出し状態、第３図ｂは、型
締め状態、第３図ｃは、材料射出開始状態、第３図ｄ
は、材料充填完了時の断面をしめす。型開き及び突き出
し状態（第３図ａ）では、バネ体５によりエジェクタス
リーブ２の先端は金型のパーティングライン９より固定
側に突き出ている。コアピン３はエジェクタスリーブ２
の軸と平行に固定側６の円錐状の突出部７で保持されて
いる。型締め開始と共に、エジェクタスリーブ２の先端
に形成された円錐状の凹部８にガイドされてコアピン３
がエジェクタスリーブ２に挿入され、円錐状の突出部７
によりエジェクタスリーブ２が押され始める。型締めが
終了すると、エジェクタスリーブ２の先端は円錐状の突
出部７により、ゲート４の深さと等しくパーティングラ
イン９より可動側10へ入りこんで溶融材料の初期流入の
ための空間となっている（第３図ｂ）。ついで、溶融材
料がゲート４を通ってキャビティー１へ流入すると、そ
の圧力とバランスするかたちでエジェクタスリーブ２を
押していたエアーシリンダ11が縮み充填が開始される
（第３図ｃ）。溶融材料は、ゲート４近傍で充填された
後、エジェクタスリーブ２及びコアピン３の軸方向と平
行に進む為、コアピン３に曲げ応力が加わる事なしに充
填が終了する（第３図ｄ）。(Embodiment 2) FIG. 3 is a sectional view of a mold showing an embodiment of the present invention.
Fig. 3a is a mold opening and protruding state, Fig. 3b is a mold clamping state, Fig. 3c is a material injection starting state, and Fig. 3d.
Shows the cross section when the material filling is completed. In the mold open and projecting state (Fig. 3a), the tip of the ejector sleeve 2 is projected by the spring body 5 from the parting line 9 of the mold to the fixed side. The core pin 3 is the ejector sleeve 2
It is held by a conical projection 7 on the fixed side 6 parallel to the axis of. When the mold clamping is started, the core pin 3 is guided by the conical recess 8 formed at the tip of the ejector sleeve 2.
Is inserted into the ejector sleeve 2 and the conical protrusion 7
Thus, the ejector sleeve 2 starts to be pushed. When the mold clamping is completed, the tip of the ejector sleeve 2 is equal to the depth of the gate 4 due to the conical protrusion 7 and enters the movable side 10 through the parting line 9 to provide a space for the initial inflow of the molten material. (Fig. 3b). Then, when the molten material flows into the cavity 1 through the gate 4, the air cylinder 11 which is pushing the ejector sleeve 2 in a manner balanced with the pressure of the molten material starts contracting and filling (FIG. 3c). After the molten material is filled in the vicinity of the gate 4, the molten material proceeds parallel to the axial direction of the ejector sleeve 2 and the core pin 3, so that the filling is completed without applying bending stress to the core pin 3 (FIG. 3d).
本発明の金型により得られる円筒成形体の穴径は、細い
径であっても実現できることが特徴であるが、その細さ
の限界は、そこに適用できるコアピン３の直径により規
正されるもので、実際には円筒形状の全体寸法や溶融材
料等の条件によりコアピン３の素材や線径が設定され
る。実施例１、実施例２によるフェルールの寸法特性を
示すのが表−１、フェルールの軸方向の外径寸法変化を
示す特性図が第４図である。いずれも、従来の方法より
高精度のフェルールが得られている。The hole diameter of the cylindrical molded body obtained by the mold of the present invention is characterized in that it can be realized even with a small diameter, but the limit of the thinness is regulated by the diameter of the core pin 3 applicable to it. In practice, the material and wire diameter of the core pin 3 are set according to the conditions such as the overall size of the cylindrical shape and the molten material. Table 1 shows the dimensional characteristics of the ferrules of Examples 1 and 2, and FIG. 4 is a characteristic diagram showing the change in the outer diameter of the ferrule in the axial direction. In each case, a ferrule with higher accuracy than the conventional method is obtained.
外径精度は、外径が3.00mmのσ値である。 The outer diameter accuracy is a σ value with an outer diameter of 3.00 mm.
穴径精度は、穴径が0.09mmのσ値である。The hole diameter accuracy is a σ value when the hole diameter is 0.09 mm.
穴曲がりは、全長10mmの５ポイントの平均値。Hole bending is an average value of 5 points with a total length of 10 mm.
以下、本発明によれば、フェルールの軸方向の表面にパ
ーティングラインによるバリの発生がなく、0.2mm以下
の細径の貫通孔を有し、内径と外径の軸ズレが極めて少
ない高精度のフェルールが生産性よく得られるという効
果を有している。Hereinafter, according to the present invention, there is no occurrence of burrs on the surface of the ferrule in the axial direction due to the parting line, it has a through hole with a diameter of 0.2 mm or less, and there is very little axial deviation between the inner diameter and the outer diameter. It has the effect that the ferrule can be obtained with high productivity.
第１図は、本発明の実施例を示す金型の断面図、第２図
は、従来の金型の断面図、第３図は、本発明の他の実施
例を示す金型の断面図、第４図は、本発明の実施例によ
るフェルールの軸方向の外径寸法変化を示す特性図であ
る。 １……キャビティー ２……エジェクタースリーブ ３……コアピン ４……ゲート ５……バネ体 ７……円錐状の突出部 ８……円錐状の凹部 11……エアーシリンダー1 is a sectional view of a mold showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional mold, and FIG. 3 is a sectional view of a mold showing another embodiment of the present invention. FIG. 4 is a characteristic diagram showing an axial outer diameter dimension change of a ferrule according to an embodiment of the present invention. 1 ... Cavity 2 ... Ejector sleeve 3 ... Core pin 4 ... Gate 5 ... Spring body 7 ... Conical protrusion 8 ... Conical recess 11 ... Air cylinder
Claims (2)
出成形する可動金型と固定金型によるものにおいて、そ
の穴を形成する為の細径コアピンを収めるエジェクタス
リーブ式構造で、コアピンを保持する部分が固定金型に
有り、固定金型のパーティング面より突出する円錐状の
先端にコアピンが保持され、エジェクタスリーブの先端
には、円錐状の凹部案内が設けてあり、エジェクタスリ
ーブは、型締め状態でコアピンを保持する円錐状の突出
部と円錐状の凹部が当接することによりゲート深さだけ
押されて初期流入空間を構成し、溶融材料の流入により
後退することを特徴とする射出成形金型。1. A core pin having an ejector sleeve type structure for accommodating a small-diameter core pin for forming a hole in a movable mold and a fixed mold for injection molding a cylindrical molded body having a hole with a diameter of 0.2 mm or less. The fixed die has a portion for holding the core pin, the core pin is held at the conical tip protruding from the parting surface of the fixed die, and the ejector sleeve has a conical recess guide at the tip. Is characterized in that when the conical protrusion that holds the core pin and the conical recess contact with each other in the mold clamped state, they are pushed by the depth of the gate to form the initial inflow space, and they recede due to the inflow of the molten material. Injection mold to do.
下の細穴を備え、円筒の肉厚は中心穴径以上で、かつ円
筒の長さは中心穴径の10倍以上であり、穴曲がり0.002
〜0.004mmであることを特徴とする特許請求の範囲第１
項記載の金型により成形されたフェルール等の射出成形
部品。2. A cylindrical molded body having a fine hole with a diameter of 0.2 mm or less in the center, the thickness of the cylinder being not less than the center hole diameter, and the length of the cylinder being not less than 10 times the center hole diameter. Bent 0.002
~ 0.004 mm, Claim 1
An injection-molded part such as a ferrule molded by the mold described in the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149613A JPH0722945B2 (en) | 1990-06-07 | 1990-06-07 | Injection molded parts and their molds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149613A JPH0722945B2 (en) | 1990-06-07 | 1990-06-07 | Injection molded parts and their molds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0441215A JPH0441215A (en) | 1992-02-12 |
| JPH0722945B2 true JPH0722945B2 (en) | 1995-03-15 |
Family
ID=15479039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2149613A Expired - Lifetime JPH0722945B2 (en) | 1990-06-07 | 1990-06-07 | Injection molded parts and their molds |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722945B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61201207A (en) * | 1985-03-04 | 1986-09-05 | Hitachi Chem Co Ltd | Production of optical connector |
-
1990
- 1990-06-07 JP JP2149613A patent/JPH0722945B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441215A (en) | 1992-02-12 |
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