JPH11105081A - Apparatus for molding ring gate of injection molding machine - Google Patents
Apparatus for molding ring gate of injection molding machineInfo
- Publication number
- JPH11105081A JPH11105081A JP28274997A JP28274997A JPH11105081A JP H11105081 A JPH11105081 A JP H11105081A JP 28274997 A JP28274997 A JP 28274997A JP 28274997 A JP28274997 A JP 28274997A JP H11105081 A JPH11105081 A JP H11105081A
- Authority
- JP
- Japan
- Prior art keywords
- pin
- cavity
- tip
- ring gate
- slope
- 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.)
- Pending
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、キャビテイ内にコ
アピンを挿入し環状の成形品を得るようにした射出成形
装置のリングゲート成形装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring gate molding device of an injection molding device in which a core pin is inserted into a cavity to obtain an annular molded product.
【０００２】[0002]
【従来の技術】従来の射出成形装置のリングゲートは図
５、図６に示す如く、キャビテイ２０内にコアピン２１
を挿入し、キャビテイ２０上端に先ピン２２下端２２ａ
を当接し、その外周のリングランナー２３の先端に成形
品２４に連通するリングゲート２５を成形していた。2. Description of the Related Art As shown in FIGS. 5 and 6, a ring gate of a conventional injection molding apparatus has a core pin 21 in a cavity 20. As shown in FIG.
Is inserted into the upper end of the cavity 20 and the lower end 22a of the tip pin 22.
And a ring gate 25 communicating with the molded product 24 is formed at the end of the ring runner 23 on the outer periphery thereof.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術は、キャ
ビテイ２０の中に長い先ピン２２を出しているので、先
端で芯ズレし易く、リングゲート２５のゲート巾２５ａ
が偏肉し、成形品２４が型から取り出し後、収縮がアン
バランスになり曲ってしまうので組立が困難になるとい
う問題点があった。In the above prior art, the long tip pin 22 is protruded into the cavity 20, so that the tip is easily misaligned at the tip and the gate width 25a of the ring gate 25 is large.
However, after the molded product 24 is taken out of the mold, the shrinkage becomes unbalanced and bends.
【０００４】[0004]
【課題を解決するための手段】本発明は上記問題点を解
決することを目的とし、キャビテイ内にコアピンを挿入
し環状の成形品を得るようにした射出成形装置に於て、
先ピン先端のテーパー合せ部とキャビテイ間の環状空隙
部に複数個の芯合せ部材を先ピン又はキャビテイ何れか
一方又は両方に固定し、リングゲート巾を均一としたこ
とを特徴とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an injection molding apparatus in which a core pin is inserted into a cavity to obtain an annular molded product.
A plurality of centering members are fixed to one or both of the tip pin and the cavity in an annular gap between the tapered portion at the tip of the tip pin and the cavity to make the ring gate width uniform.
【０００５】[0005]
【発明の実施の形態】本発明の実施の形態を図１乃至図
４に示した各実施例に基づいて詳細に説明する。図１、
図２は本発明の第１実施例である。１はキャビテイ、２
は先ピン、３は先端がフリーになっているコアピンで、
リングランナー４から成形品部５にリング状に樹脂が流
入する。先ピン２先端近傍径方向に４個の位置合せ部材
６を固定している。該位置合せ部材６の外側垂直面６ａ
に合せてリングランナー４の内側面４ａに当接し、外側
垂直面６ａ下端より中心方向に傾斜した位置合せ斜面６
ｂを形成し、該位置合せ斜面６ｂの傾斜に合せてリング
ゲート７を形成している。従って、先ピン２先端とキャ
ビテイ１の先ピン２先端対向部間のリングゲート７の巾
７ａは均一になる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the embodiments shown in FIGS. Figure 1,
FIG. 2 shows a first embodiment of the present invention. 1 is cavity, 2
Is the tip pin, 3 is the core pin with a free tip,
The resin flows into the molded part 5 from the ring runner 4 in a ring shape. Four positioning members 6 are fixed in the radial direction near the tip of the tip pin 2. Outer vertical surface 6a of the positioning member 6
The alignment slope 6 abuts on the inner side surface 4a of the ring runner 4 and is inclined toward the center from the lower end of the outer vertical surface 6a.
b is formed, and the ring gate 7 is formed in accordance with the inclination of the alignment slope 6b. Therefore, the width 7a of the ring gate 7 between the tip of the tip pin 2 and the facing portion of the tip of the tip 1 of the cavity 1 becomes uniform.
【０００６】図３、図４は本発明の第２実施例である。
１１はキャビテイ、１２は先ピン、１３は先端がフリー
になっているコアピンで、リングランナー１４から成形
品部１５にリングゲート１６を通って樹脂が流入する。
先ピン１２先端に対向しているキャビテイ１１の内面に
は先ピン１２に向って４個の位置合せ部材１７を固定し
ている。該位置合せ部材１７は上面が先ピン１２の先端
斜面１２ａに合致する上部斜面１７ａが形成され芯ズレ
が生じないように位置合せをし、下部斜面１７ｂに合せ
てリングゲート１６を形成している。従って先ピン１２
先端とキャビテイ１１の先ピン１２先端対向部間のリン
グゲート１６の巾１６ａは均一になる。なお、位置決め
部材は第１実施例の如く、先ピン側及びキャビテイ側両
方から出してもよい。FIGS. 3 and 4 show a second embodiment of the present invention.
11 is a cavity, 12 is a leading pin, and 13 is a core pin having a free end.
Four positioning members 17 are fixed to the inner surface of the cavity 11 facing the tip of the tip pin 12 toward the tip pin 12. The positioning member 17 is positioned so that an upper slope 17a having an upper surface coinciding with the tip slope 12a of the front pin 12 is formed so that there is no misalignment, and a ring gate 16 is formed in accordance with the lower slope 17b. . Therefore, the tip pin 12
The width 16a of the ring gate 16 between the tip and the facing portion of the tip of the tip 12 of the cavity 11 becomes uniform. The positioning member may be protruded from both the tip pin side and the cavity side as in the first embodiment.
【０００７】[0007]
【発明の効果】本発明によると、キャビテイ内にコアピ
ンを挿入し環状の成形品を得るようにした射出成形装置
に於て、先ピン先端のテーパー合せ部とキャビテイ間の
環状空隙部に複数個の芯合せ部材を先ピン又はキャビテ
イ何れか一方又は両方に固定し、リングゲート巾を均一
としてあるので、先ピン先端の位置合せ斜面に位置合せ
部材の斜面を当接して芯合せを行うので芯ズレがなくゲ
ート巾が均一となり、偏肉がなく巾が均一な成形品を得
ることができる。According to the present invention, in an injection molding apparatus in which a core pin is inserted into a cavity to obtain an annular molded product, a plurality of annular moldings are provided in an annular gap between the tapered portion at the tip of the leading pin and the cavity. The centering member is fixed to one or both of the tip pin and the cavity, and the ring gate width is uniform. Therefore, the centering is performed by contacting the slope of the positioning member with the positioning slope at the tip of the front pin. The gate width is uniform without deviation, and a molded product with uniform width without uneven thickness can be obtained.
【図１】本発明の第１実施例リングゲート部正断面部分
図である。FIG. 1 is a partial sectional front view of a first embodiment of the present invention; FIG.
【図２】図１のＡ−Ａ平断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】本発明の第２実施例リングゲート部正断面部分
図である。FIG. 3 is a partial sectional front view of a second embodiment of the present invention;
【図４】図３のＡ−Ａ平断面図である。FIG. 4 is an AA plane sectional view of FIG. 3;
【図５】従来のリングゲートによる成形金型正断面図で
ある。FIG. 5 is a front sectional view of a molding die using a conventional ring gate.
【図６】図５のリングゲート部の拡大正断面図である。FIG. 6 is an enlarged front sectional view of the ring gate section of FIG. 5;
１，１１ キャビテイ ２，１２ 先ピン ３，１３ コアピン ４，１４ リングランナー ４ａ リングランナーの内側面 ５ 成形品部 ６ 位置合せ部材 ６ａ 位置合せ部材の外側垂直面 ７ リングゲート ７ａ リングゲートの巾 １２ａ 先ピンの斜面 １６ リングゲート １６ａ リングゲートの巾 １７ 位置合せ部材 １７ａ 位置合せ部材の上部斜面 １７ｂ 位置合せ部材の下部斜面 DESCRIPTION OF SYMBOLS 1,11 Cavity 2,12 Tip pin 3,13 Core pin 4,14 Ring runner 4a Inner side surface of ring runner 5 Mold part 6 Positioning member 6a Outside vertical surface of positioning member 7 Ring gate 7a Ring gate width 12a point Pin slope 16 Ring gate 16a Ring gate width 17 Alignment member 17a Upper slope of alignment member 17b Lower slope of alignment member
Claims (1)
成形品を得るようにした射出成形装置に於て、先ピン先
端のテーパー合せ部とキャビテイ間の環状空隙部に複数
個の芯合せ部材を先ピン又はキャビテイ何れか一方又は
両方に固定し、リングゲート巾を均一とした射出成形装
置のリングゲート成形装置。In an injection molding apparatus in which a core pin is inserted into a cavity to obtain an annular molded product, a plurality of centering members are provided in a tapered portion at the tip of a leading pin and an annular space between the cavities. A ring gate molding device of an injection molding device fixed to one or both of a tip pin and a cavity to make the ring gate width uniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28274997A JPH11105081A (en) | 1997-09-30 | 1997-09-30 | Apparatus for molding ring gate of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28274997A JPH11105081A (en) | 1997-09-30 | 1997-09-30 | Apparatus for molding ring gate of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11105081A true JPH11105081A (en) | 1999-04-20 |
Family
ID=17656564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28274997A Pending JPH11105081A (en) | 1997-09-30 | 1997-09-30 | Apparatus for molding ring gate of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11105081A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007062121A (en) * | 2005-08-31 | 2007-03-15 | Pentel Corp | Mold device |
| WO2016038742A1 (en) * | 2014-09-12 | 2016-03-17 | 株式会社コジマプラスチックス | Injection molding die and resin molding manufacturing method |
| CN112620604A (en) * | 2020-12-18 | 2021-04-09 | 苏州广型模具有限公司 | Core-pulling parting structure of lightweight valve body die-casting die |
-
1997
- 1997-09-30 JP JP28274997A patent/JPH11105081A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007062121A (en) * | 2005-08-31 | 2007-03-15 | Pentel Corp | Mold device |
| JP4544102B2 (en) * | 2005-08-31 | 2010-09-15 | ぺんてる株式会社 | Mold equipment |
| WO2016038742A1 (en) * | 2014-09-12 | 2016-03-17 | 株式会社コジマプラスチックス | Injection molding die and resin molding manufacturing method |
| US9533442B2 (en) | 2014-09-12 | 2017-01-03 | Kojima Plastics Co., Ltd. | Injection mold and method of producing molded resin article |
| CN112620604A (en) * | 2020-12-18 | 2021-04-09 | 苏州广型模具有限公司 | Core-pulling parting structure of lightweight valve body die-casting die |
| CN112620604B (en) * | 2020-12-18 | 2022-02-18 | 苏州广型模具有限公司 | Core-pulling parting structure of lightweight valve body die-casting die |
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