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JP4813940B2 - Runner lock pin - Google Patents

Runner lock pin Download PDF

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Publication number
JP4813940B2
JP4813940B2 JP2006082071A JP2006082071A JP4813940B2 JP 4813940 B2 JP4813940 B2 JP 4813940B2 JP 2006082071 A JP2006082071 A JP 2006082071A JP 2006082071 A JP2006082071 A JP 2006082071A JP 4813940 B2 JP4813940 B2 JP 4813940B2
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Japan
Prior art keywords
undercut
runner
lock pin
runner lock
cross
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Expired - Fee Related
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JP2006082071A
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JP2007253496A (en
Inventor
真史 塩崎
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Tigers Polymer Corp
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Tigers Polymer Corp
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Description

本発明は、ピンゲートやトンネルゲート等が形成された射出成形用金型に設置されるランナーロックピンに関するものである。   The present invention relates to a runner lock pin installed in an injection mold in which a pin gate, a tunnel gate and the like are formed.

射出成形においてピンゲートやトンネルゲート等の場合には型開き時に製品部とランナー部を切り離す必要があり、そのためにランナーロックピンを使用する場合が多い。ランナーロックピンは製品によりランナー部を切り離す力が変わってくるため、アンダーカット部の大きさを変えてランナーロック力を調整する必要があった。しかし、従来のアンダーカット部は径方向の断面が円形をしており、アンダーカット部の大きさが周方向に均一であるため、アンダーカット部を大きくし過ぎるとアンダーカット部に樹脂が巻き付いて残り、アンダーカット部の効果が損なわれるばかりでなく、連続成形が困難になる問題があった。この問題を解決するため、特許文献1にはアンダーカット部の切り込み深さを小さくしてアンダーカット部に樹脂を残り難くし、複数のアンダーカット部を設けて従来のランナーロック力を維持でき、生産性を向上させたランナーロックピンが記載されている。
特開平11−5234号公報
In the case of a pin gate or tunnel gate in injection molding, it is necessary to separate the product portion from the runner portion when the mold is opened, and therefore, a runner lock pin is often used. The runner lock pin needs to adjust the runner lock force by changing the size of the undercut because the force to separate the runner varies depending on the product. However, the conventional undercut part has a circular cross section in the radial direction, and the size of the undercut part is uniform in the circumferential direction. Therefore, if the undercut part is too large, resin will wrap around the undercut part. In addition, the effect of the undercut portion is not only impaired, but there is a problem that continuous molding becomes difficult. In order to solve this problem, Patent Document 1 makes it difficult to leave the resin in the undercut portion by reducing the cutting depth of the undercut portion, and can maintain a conventional runner locking force by providing a plurality of undercut portions, Runner lock pins with improved productivity are described.
Japanese Patent Laid-Open No. 11-5234

しかしながら、アンダーカット部を複数形成するとランナー部において不要な樹脂が増えるばかりでなく、流動抵抗が大きくなるなど様々な問題を生じる恐れがあった。本発明は上記問題に鑑み、ランナーロックピンのアンダーカット部の周方向におけるアンダーカット部の大きさを変化させることで流動抵抗および不要な樹脂を最小限に抑えることができ、また、アンダーカット部に樹脂が残り難くすることできることを知見し、本発明を完成するに至ったものである。   However, when a plurality of undercut portions are formed, not only unnecessary resin is increased in the runner portion, but various problems such as an increase in flow resistance may occur. In view of the above problems, the present invention can minimize the flow resistance and unnecessary resin by changing the size of the undercut portion in the circumferential direction of the undercut portion of the runner lock pin. In view of this, it was found that the resin could hardly remain, and the present invention was completed.

本発明は棒状の本体部、本体部の一端部に鍔部、他端部にアンダーカット部を有する射出成形用金型のランナーロックピンであって、前記アンダーカット部の軸上に沿った断面形状を前記軸に対称に形成し、かつ、前記アンダーカット部の外周上の任意の異なる点から前記軸に向かって見た前記断面形状の面積を互いに異なる部分があるように形成している(請求項1)。   The present invention is a runner lock pin of an injection mold having a rod-like main body part, a collar part at one end of the main body part, and an undercut part at the other end part, and a cross section along the axis of the undercut part The shape is formed symmetrically with respect to the axis, and the areas of the cross-sectional shapes viewed from the arbitrary different points on the outer periphery of the undercut portion toward the axis are formed so that there are different portions ( Claim 1).

本発明のランナーロックピンはアンダーカット部の軸上に沿った断面形状を軸に対称に形成し、かつ、アンダーカット部の外周上の任意の異なる点から軸に向かって見た断面形状の面積が互いに異なる部分があるように形成する事で、断面形状の面積の小さい部分と大きい部分が形成され、ランナーロックピンからランナー部を無理抜きする際、断面積の小さい部分、すなわち、アンダーカット部の小さい部分では、ランナー部が抜け易くなる。一部分が抜けることで、従来のようにランナーロックピンのアンダーカット部に破断した樹脂がリング状に巻きついたまま残らなくなり、断面積の大きい部分においても、例え無理抜きでアンダーカット部の樹脂が破断しても、そのままランナーロックピンに残り難くなる。   The runner lock pin of the present invention is formed symmetrically with the cross-sectional shape along the axis of the undercut portion as the axis, and the area of the cross-sectional shape viewed from the arbitrary different points on the outer periphery of the undercut portion toward the axis By forming so that there are different parts from each other, a small area and a large area of the cross-sectional shape are formed, and when the runner part is forcibly removed from the runner lock pin, the part having a small cross-sectional area, that is, the undercut part In the small portion, the runner portion is easily removed. As a result, the resin that is broken in the undercut part of the runner lock pin does not remain in the ring shape as in the past, and even in the part with a large cross-sectional area, the resin in the undercut part is removed without force. Even if it breaks, it remains difficult to remain on the runner lock pin.

アンダーカット部の断面形状の面積はランナーロック力と比例関係にあることから、断面形状の面積の大きい部分を設けることでランナーロック力を大きくすることができ、ランナーロック力を容易に調整することができる。   Since the area of the cross-sectional shape of the undercut part is proportional to the runner lock force, the runner lock force can be increased by providing a large cross-sectional area, and the runner lock force can be adjusted easily. Can do.

本発明によれば、ランナー部において流動抵抗および不要な樹脂を最小限に抑え、アンダーカット部に樹脂が残り難くすることができ、生産性を向上でき、さらには、ランナーロック力を容易に調整することができる。   According to the present invention, the flow resistance and unnecessary resin can be minimized in the runner portion, the resin can hardly remain in the undercut portion, the productivity can be improved, and the runner locking force can be easily adjusted. can do.

以下、本発明のランナーロックピンについて実施例を参照して説明する。   Hereinafter, the runner lock pin of the present invention will be described with reference to examples.

図1は本発明のランナーロックピンの斜視図である。ランナーロックピン1は鍔部11、本体部12、テーパー部13で構成されている。本体部12に対してテーパー部13は外周にアンダーカット部14を形成するように形成されている。鍔部11、本体部12、アンダーカット部14を形成するテーパー部13の各々の軸芯は軸15上に形成されている。   FIG. 1 is a perspective view of a runner lock pin of the present invention. The runner lock pin 1 includes a flange portion 11, a main body portion 12, and a tapered portion 13. The taper portion 13 is formed so as to form an undercut portion 14 on the outer periphery with respect to the main body portion 12. The shaft cores of the tapered portion 13 that forms the flange portion 11, the main body portion 12, and the undercut portion 14 are formed on the shaft 15.

図2は図1の正面図である。鍔部11は本体部12より大きい円形状に形成されている。本体部12はテーパー部13より大きい円形状に形成されている。テーパー部13は長円形状に形成され、長軸の両端部がほぼ半円形状で長手方向の両側縁に直線部13aが形成されている。A−A矢視線はB−B矢視線と軸15上で直交されている。   FIG. 2 is a front view of FIG. The collar portion 11 is formed in a circular shape larger than the main body portion 12. The main body portion 12 is formed in a circular shape larger than the tapered portion 13. The tapered portion 13 is formed in an oval shape, both end portions of the major axis are substantially semicircular, and straight portions 13a are formed on both side edges in the longitudinal direction. The AA arrow line is orthogonal to the BB arrow line on the axis 15.

図3は図2のA−A矢視断面図である。テーパー部13の外周にはアンダーカット部14a,14aが形成されている。アンダーカット部14a,14aの形状は軸15に対して対称に形成されている。   3 is a cross-sectional view taken along the line AA in FIG. Undercut portions 14 a and 14 a are formed on the outer periphery of the tapered portion 13. The shapes of the undercut portions 14 a and 14 a are formed symmetrically with respect to the axis 15.

図4は図2のB−B矢視断面図である。テーパー部13の外周にはアンダーカット部14b,14bが形成されている。アンダーカット部14b,14bの形状は軸15に対して対称に形成されている。アンダーカット部14b,14bは図2のアンダーカット部14a,14aの断面形状の面積より小さく形成されている。   4 is a cross-sectional view taken along line BB in FIG. Undercut portions 14 b and 14 b are formed on the outer periphery of the tapered portion 13. The shapes of the undercut portions 14 b and 14 b are formed symmetrically with respect to the axis 15. The undercut portions 14b and 14b are formed smaller than the area of the cross-sectional shape of the undercut portions 14a and 14a in FIG.

図5は図1のランナーロックピンを設置した金型の一部断面図である。ランナーロックピン1は押え部材21で押えられている。取付板22とストッパープレート23に形成された挿通部25に挿通されている。ランナープレート24に形成されたランナー部2にテーパー部13が設置されている。ランナー部2には樹脂が充填されている。   FIG. 5 is a partial cross-sectional view of a mold provided with the runner lock pin of FIG. The runner lock pin 1 is pressed by a presser member 21. The mounting plate 22 and the stopper plate 23 are inserted through insertion portions 25 formed in the mounting plate 22 and the stopper plate 23. A tapered portion 13 is installed on the runner portion 2 formed on the runner plate 24. The runner part 2 is filled with resin.

本発明のランナーロックピンはアンダーカット部の断面形状が軸を対称に形成され、かつ、アンダーカット部の外周上の任意の異なる点から軸に向かって見た断面形状の面積が互いに異なる部分があるように形成されればよく、アンダーカット部の形状は実施例に限定されない。例えば、図6の(a)、(b)、(c)に示すランナーロックピン1aのような形状であってもよい。また、実施例ではアンダーカット部を形成するテーパー部の軸芯を本体部および鍔部と同一軸上に形成しているが、テーパー部は本体部に対してアンダーカット部を形成するように設置されればよく、同一軸上に形成されなくてもよい。   In the runner lock pin of the present invention, the cross-sectional shape of the undercut portion is formed symmetrically with respect to the axis, and the areas of the cross-sectional shapes viewed from the different points on the outer periphery of the undercut portion are different from each other. The shape of the undercut portion is not limited to the embodiment. For example, the shape like the runner lock pin 1a shown to (a) of FIG. 6, (b), (c) may be sufficient. In the embodiment, the shaft core of the tapered portion forming the undercut portion is formed on the same axis as the main body portion and the flange portion, but the tapered portion is installed so as to form an undercut portion with respect to the main body portion. It does not have to be formed on the same axis.

本発明のランナーロックピンの斜視図である。It is a perspective view of the runner lock pin of the present invention. 図1の正面図である。It is a front view of FIG. 図2のA−A矢視断面図である。It is AA arrow sectional drawing of FIG. 図2のB−B矢視断面図である。It is a BB arrow sectional view of Drawing 2. 図1のランナーロックピンを設置した金型の一部断面図である。It is a partial cross section figure of the metal mold | die which installed the runner lock pin of FIG. 本発明のランナーロックピンの他の実施例の斜視図である。It is a perspective view of the other Example of the runner lock pin of this invention.

符号の説明Explanation of symbols

1,1a ランナーロックピン
2 ランナー部
11 鍔部
12 本体部
13 テーパー部
13a 直線部
14,14a,14b アンダーカット部
15 軸
21 押え部材
22 取付板
23 ストッパープレート
24 ランナープレート
25 挿通部
1, 1a Runner lock pin 2 Runner part 11 Gutter part 12 Body part 13 Taper part 13a Linear part 14, 14a, 14b Undercut part 15 Shaft 21 Presser member 22 Mounting plate 23 Stopper plate 24 Runner plate 25 Insertion part

Claims (1)

棒状の本体部、本体部の一端部に鍔部、他端部にアンダーカット部を有する射出成形用金型のランナーロックピンであって、前記アンダーカット部の軸上に沿った断面形状を前記軸に対称に形成し、かつ、前記アンダーカット部の外周上の任意の異なる点から前記軸に向かって見た前記断面形状の面積を互いに異なる部分があるように形成したことを特徴とするランナーロックピン。   A rod-shaped main body part, a runner lock pin of an injection mold having a collar part at one end of the main body part and an undercut part at the other end part, wherein the cross-sectional shape along the axis of the undercut part is A runner characterized in that it is formed symmetrically with respect to an axis, and is formed so that there are different portions of the cross-sectional shape viewed from the arbitrary different points on the outer periphery of the undercut portion toward the axis. Lock pin.
JP2006082071A 2006-03-24 2006-03-24 Runner lock pin Expired - Fee Related JP4813940B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006082071A JP4813940B2 (en) 2006-03-24 2006-03-24 Runner lock pin

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Application Number Priority Date Filing Date Title
JP2006082071A JP4813940B2 (en) 2006-03-24 2006-03-24 Runner lock pin

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JP2007253496A JP2007253496A (en) 2007-10-04
JP4813940B2 true JP4813940B2 (en) 2011-11-09

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ID=38628212

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Application Number Title Priority Date Filing Date
JP2006082071A Expired - Fee Related JP4813940B2 (en) 2006-03-24 2006-03-24 Runner lock pin

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07205188A (en) * 1994-01-11 1995-08-08 Citizen Watch Co Ltd Resin molding machine and method
JPH09141697A (en) * 1995-11-21 1997-06-03 Nok Corp Injection molding die
JP3992328B2 (en) * 1997-06-17 2007-10-17 シチズン電子株式会社 Runner lock pin
JP3797005B2 (en) * 1999-01-29 2006-07-12 ぺんてる株式会社 Bonding structure of extrusion pin and runner of injection molding equipment

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