JP3125468B2 - Injection mold - Google Patents

Injection mold

Info

Publication number
JP3125468B2
JP3125468B2 JP04268947A JP26894792A JP3125468B2 JP 3125468 B2 JP3125468 B2 JP 3125468B2 JP 04268947 A JP04268947 A JP 04268947A JP 26894792 A JP26894792 A JP 26894792A JP 3125468 B2 JP3125468 B2 JP 3125468B2
Authority
JP
Japan
Prior art keywords
resin
gate
injection hole
movable rod
cavity
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
Application number
JP04268947A
Other languages
Japanese (ja)
Other versions
JPH06114892A (en
Inventor
与志信 武田
Original Assignee
三菱マテリアル株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Priority to JP04268947A priority Critical patent/JP3125468B2/en
Publication of JPH06114892A publication Critical patent/JPH06114892A/en
Application granted granted Critical
Publication of JP3125468B2 publication Critical patent/JP3125468B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/27Sprue channels Runner channels or runner nozzles
    • B29C45/28Closure devices therefor
    • B29C45/2806Closure devices therefor consisting of needle valve systems

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、可動ロッドの先端で樹
脂注入孔を開閉するバルブゲート方式の射出成形金型に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve gate type injection mold for opening and closing a resin injection hole at the tip of a movable rod.

【0002】[0002]

【従来の技術】従来、この種の射出成形金型としては、
固定型板と可動型板との間にキャビティが形成され、固
定型板内に樹脂注入孔を経て上記キャビティに連通する
樹脂通路が設けられ、かつこの樹脂通路内に軸方向に移
動可能に可動ロッドが配置される一方、この可動ロッド
の先端で樹脂注入孔を開閉する構成のものが知られてい
る。そして、上記可動ロッドの基端には、この可動ロッ
ドを移動させるシリンダ機構が連結されており、このシ
リンダ機構のピストンの前後進により、上記可動ロッド
が樹脂注入孔を閉じあるいは開くようになっている。
2. Description of the Related Art Conventionally, injection molding dies of this kind include:
A cavity is formed between the fixed mold plate and the movable mold plate, and a resin passage communicating with the cavity through a resin injection hole is provided in the fixed mold plate, and is movable movably in the axial direction in the resin passage. A configuration in which a resin injection hole is opened and closed at the tip of the movable rod while a rod is disposed is known. A cylinder mechanism for moving the movable rod is connected to the base end of the movable rod, and the movable rod closes or opens the resin injection hole by moving the piston of the cylinder mechanism back and forth. I have.

【0003】[0003]

【発明が解決しようとする課題】ところで、上記従来の
可動ロッドによって樹脂注入孔を開閉する構成の射出成
形金型にあっては、樹脂注入孔位置は、通常、固定型板
の彫刻面に設定されているため、この彫刻面によって形
成された成形品の表面に樹脂注入孔跡が残るようになっ
ている。しかしながら、このように表面に樹脂注入孔跡
が残ると、見栄えが悪くなり、外観上問題になる場合が
あると共に、例えば、樹脂製レンズのような場合には、
機能上も問題となる。
By the way, in the above-mentioned conventional injection mold in which the resin injection hole is opened and closed by the movable rod, the position of the resin injection hole is usually set on the engraved surface of the fixed mold plate. Therefore, traces of resin injection holes are left on the surface of the molded product formed by the engraved surface. However, when the resin injection hole traces remain on the surface in this way, the appearance becomes poor, and there is a case where there is a problem in appearance, for example, in the case of a resin lens,
There is also a problem in functionality.

【0004】本発明は、上記事情に鑑みてなされたもの
で、その目的とするところは、成形品の表面に樹脂注入
孔跡(ゲート跡)が現れることがなく、機能的に問題に
なることがないと共に、見栄えが良好でかつ商品価値が
高い成形品を容易にかつ確実に成形することができる射
出成形金型を提供することにある。
[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin-injection hole mark (gate mark) on the surface of a molded product, which is a functional problem. Another object of the present invention is to provide an injection mold capable of easily and surely molding a molded article having good appearance and high commercial value.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明は、一対の型板間に成形品のキャビティが形
成され、一方の型板内に樹脂注入孔を経て上記キャビテ
ィに連通する樹脂通路が設けられ、かつこの樹脂通路内
に軸方向に移動可能に可動ロッドが配置され、この可動
ロッドの先端で上記樹脂注入孔を開閉する射出成形金
型において、上記樹脂注入孔に連通されたキャビティの
側部と樹脂溜り部との間にゲートが設けられ、かつ上記
可動ロッドの先端に、可動ロッドが樹脂注入孔に挿入さ
れて樹脂注入孔を閉鎖した状態で他方の型板のゲート面
に当接して上記ゲートを閉鎖する先細状のゲートカット
部が形成され、このゲートカット部のキャビティ側の面
が該部の成形品形状とされたものである。
In order to achieve the above object, according to the present invention, a cavity for a molded product is formed between a pair of mold plates, and one of the mold plates communicates with the cavity through a resin injection hole. A resin rod is provided, and a movable rod is disposed in the resin path so as to be movable in the axial direction. In the injection molding die that opens and closes the resin injection hole at the tip of the movable rod , A gate is provided between the side of the communicating cavity and the resin reservoir , and the movable rod is inserted into the resin injection hole at the tip of the movable rod.
With the resin injection hole closed and the gate surface of the other template
A tapered gate cut portion that closes the gate by contacting the gate cut portion is formed, and a surface of the gate cut portion on the cavity side is formed.
Is the shape of the molded product of the portion.

【0006】[0006]

【作用】本発明の射出成形金型にあっては、可動ロッド
を樹脂注入孔から引き抜いてこれを開くことにより、樹
脂通路から樹脂注入孔及びゲートを介してキャビティの
側部から内部に溶融樹脂を円滑に注入した後、上記可動
ロッド樹脂注入孔に挿入してこれを閉じ樹脂通路から
の溶融樹脂の供給を遮断すると共に、上記可動ロッドの
先端に形成されたゲートカット部によってゲートを閉
じ、キャビティ内の成形品の側部とその他のランナー部
(樹脂溜り部)とをゲートを境として切り離す。
According to the injection mold of the present invention, the movable rod
Inserts by opening the are come withdrawn from trees fat injection hole, after smoothly injected inside the molten resin from the side of the cavity from the resin passage through the resin injection hole and the gate, the movable rod in the resin injection hole Then, the supply of the molten resin from the resin passage is shut off, and the gate is closed by a gate cut portion formed at the tip of the movable rod, and the side of the molded product in the cavity and other runner portions (resin And the reservoir) at the gate.

【0007】[0007]

【実施例】以下、図1と図2に基づいて本発明の一実施
例を説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

【0008】これらの図において符号1は固定型板であ
り、この固定型板1に対して可動型板2が接近、離間自
在に設けられていると共に、これらの型板1,2間に
は、成形品(例えば、レンズ)形状をなすキャビティ3
が形成されている。そして、このキャビティ3の側部に
はゲート4が設けられており、このゲート4には、可動
型板2に形成された略円形薄肉状の樹脂溜り部5が連結
されている。また、上記ゲート4に対向して、上記固定
型板1には、樹脂注入孔6が形成されており、この樹脂
注入孔6に連通する溶融樹脂通路7を備えた筒状体8が
上記固定型板1に装着されている。そして、上記筒状体
8の内部の溶融樹脂通路7には、可動ロッド9がその軸
線に沿って移動自在に設けられており、この可動ロッド
9は図示しない移動機構によって駆動させられ上記樹
脂注入孔6に挿入されてこれ閉鎖するようになってい
る。さらに、上記可動ロッド9の先端には、図1に示す
ように、可動ロッド9が樹脂注入孔6に挿入されて樹脂
注入孔6を閉鎖した状態で可動型板2側のゲート面(キ
ャビティ面)に当接して上記ゲート4を閉鎖するゲート
カット部10が形成されており、このゲートカット部1
0は断面形状略矩形状にかつ先細状に形成されていると
共に、このゲートカット部10の、上記ゲート4との対
向面11、つまりキャビティ3側の面は、上記成形品形
状をなすキャビティ3の曲面に一致するような凹面形状
に形成されている。
In these figures, reference numeral 1 denotes a fixed mold plate, and a movable mold plate 2 is provided so as to be able to approach and separate from the fixed mold plate 1, and between these mold plates 1 and 2. A cavity 3 in the form of a molded article (eg, a lens)
Are formed. A gate 4 is provided on the side of the cavity 3, and a substantially circular thin-walled resin reservoir 5 formed on the movable mold plate 2 is connected to the gate 4. A resin injection hole 6 is formed in the fixed mold plate 1 so as to face the gate 4. The cylindrical body 8 having a molten resin passage 7 communicating with the resin injection hole 6 is fixed to the fixed body 1. It is mounted on the template 1. A movable rod 9 is provided in the molten resin passage 7 inside the cylindrical body 8 so as to be movable along the axis thereof. The movable rod 9 is driven by a moving mechanism (not shown) , It is inserted into the injection hole 6 to close it. Further, the tip of the movable rod 9 is shown in FIG.
The movable rod 9 is inserted into the resin injection hole 6 so that the resin
With the injection hole 6 closed, the gate surface (key) on the movable mold plate 2 side
(Gate surface), and a gate cut portion 10 for closing the gate 4 is formed.
Reference numeral 0 denotes a cross-sectional shape that is substantially rectangular and tapered, and a surface 11 of the gate cut portion 10 facing the gate 4 , that is, a surface on the cavity 3 side is a cavity 3 having the shape of the molded product. Is formed in a concave shape so as to match the curved surface.

【0009】上記のように構成された射出成形金型にあ
っては、型締め状態において、可動ロッド9を所定距離
移動させることにより、ゲート4及び樹脂注入孔6を開
放する。この結果、筒状体8の溶融樹脂通路7、樹脂注
入孔6及びゲート4を通って、所要量の溶融樹脂がキャ
ビティ3に円滑に供給される。続いて、上記可動ロッド
9を元の位置に戻すことにより、可動ロッド9の先端部
によって樹脂注入孔6を閉鎖すると共に、可動ロッド9
のゲートカット部10によってゲート4を閉鎖する。こ
の結果、固定型板1と可動型板2の合わせ面及びゲート
カット部10の対向面11によって、成形品のキャビテ
ィ3が容易に形成されて、このキャビティ3内に確実に
成形品が成形されると共に、ゲート4を境にして樹脂溜
り部5が円滑に上記成形品から分離される。次いで、型
開工程に移り、固定型板1に対して可動型板2を開くこ
とにより、キャビティ3内の成形品を可動型板2側に付
着した状態で移動させた後、図示しない突出ピンによっ
て上記キャビティ3内の成形品を固定型板1側に突き出
して離型させると共に、樹脂溜り部5で固化した樹脂は
図示しない吸着手段によって吸着して可動型板2から取
り除く。このようにして、上記可動ロッド9によって樹
脂注入孔6を閉鎖すると共に、可動ロッド9の先端のゲ
ートカット部10によってゲート4を閉鎖する際に、こ
のゲートカット部10の対向面11によって成形品の側
部の一部を形成するから、成形品の表面にゲート跡が残
ることがなく、見栄えが良好でかつ機能的にも問題のな
い製品を容易に成形することができる。
In the injection mold having the above-described structure, the gate 4 and the resin injection hole 6 are opened by moving the movable rod 9 for a predetermined distance in the clamped state. As a result, a required amount of molten resin is smoothly supplied to the cavity 3 through the molten resin passage 7, the resin injection hole 6, and the gate 4 of the cylindrical body 8. Subsequently, by returning the movable rod 9 to the original position, the resin injection hole 6 is closed by the tip of the movable rod 9 and the movable rod 9 is closed.
The gate 4 is closed by the gate cut portion 10 of FIG. As a result, the cavity 3 of the molded product is easily formed by the mating surface of the fixed mold plate 1 and the movable mold plate 2 and the facing surface 11 of the gate cut portion 10, and the molded product is reliably molded in the cavity 3. At the same time, the resin pool portion 5 is smoothly separated from the molded product with the gate 4 as a boundary. Next, the process proceeds to a mold opening step, in which the molded product in the cavity 3 is moved while being attached to the movable mold plate 2 by opening the movable mold plate 2 with respect to the fixed mold plate 1. As a result, the molded product in the cavity 3 protrudes toward the fixed mold plate 1 and is released from the mold, and the resin solidified in the resin reservoir 5 is removed by suction means (not shown) from the movable mold plate 2. In this manner, when the resin injection hole 6 is closed by the movable rod 9 and the gate 4 is closed by the gate cut portion 10 at the tip of the movable rod 9, the molded product is formed by the opposing surface 11 of the gate cut portion 10. Since a part of the side portion is formed, a gate mark does not remain on the surface of the molded product, and a product having good appearance and having no functional problem can be easily molded.

【0010】[0010]

【発明の効果】以上説明したように、本発明は、一対の
型板間に成形品のキャビティが形成され、一方の型板内
に樹脂注入孔を経て上記キャビティに連通する樹脂通路
が設けられ、かつこの樹脂通路内に軸方向に移動可能に
可動ロッドが配置され、この可動ロッドの先端で上記
樹脂注入孔を開閉する射出成形金型において、上記樹脂
注入孔に連通されたキャビティの側部と樹脂溜り部との
間にゲートが設けられ、かつ上記可動ロッドの先端に、
可動ロッドが樹脂注入孔に挿入されて樹脂注入孔を閉鎖
した状態で他方の型板のゲート面に当接して上記ゲート
閉鎖する先細状のゲートカット部が形成され、このゲ
ートカット部のキャビティ側の面が該部の成形品形状と
れたものであるから、可動ロッドを移動して樹脂注入
孔を開くことにより、樹脂通路から樹脂注入孔及びゲー
トを介してキャビティの側部から内部に溶融樹脂を円滑
に注入した後、上記可動ロッドによって樹脂注入孔を閉
じて樹脂通路からの溶融樹脂の供給を遮断すると共に、
上記可動ロッドの先端に形成されたゲートカット部によ
ってゲートを閉じ、キャビティ内の成形品の側部とその
他のランナー部(樹脂溜り部)とをゲートを境として切
り離すことにより、成形品の表面に樹脂注入孔跡(ゲー
ト跡)が現れることがなく、機能的に問題になることが
ないと共に、見栄えが良好でかつ商品価値が高い成形品
を容易にかつ確実に成形することができる。
As described above, according to the present invention, a cavity of a molded product is formed between a pair of mold plates, and a resin passage communicating with the cavity through a resin injection hole is provided in one of the mold plates. and movably movable rod axially to the resin passage is disposed in the injection mold for opening and closing the resin injection hole at the tip end of the movable rod, the side of the cavity communicating with the said resin injection hole A gate is provided between the portion and the resin reservoir , and at the tip of the movable rod,
A movable rod is inserted into the resin injection hole to close the resin injection hole
State tapered gate cut portion for closing the gate in contact with the gate surface of the other mold plate is formed with, this gate
The cavity side surface of the heat cut part is
Since the movable rod is moved to open the resin injection hole, the molten resin is smoothly injected into the inside from the side of the cavity through the resin injection hole and the gate by moving the movable rod. The movable rod closes the resin injection hole and shuts off the supply of molten resin from the resin passage.
The gate is closed by a gate cut portion formed at the tip of the movable rod, and the side of the molded product in the cavity is separated from the other runner portion (resin reservoir) by the gate as a boundary, so that the surface of the molded product is cut off. A resin injection hole mark (gate mark) does not appear, there is no functional problem, and a molded product with good appearance and high commercial value can be easily and reliably molded.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.

【図2】型板の合わせ面の説明図である。FIG. 2 is an explanatory diagram of a mating surface of a template.

【符号の説明】[Explanation of symbols]

1 固定型板 2 可動型板 3 キャビティ 4 ゲート 6 樹脂注入孔 7 溶融樹脂通路 9 可動ロッド 10 ゲートカット部 Reference Signs List 1 fixed mold plate 2 movable mold plate 3 cavity 4 gate 6 resin injection hole 7 molten resin passage 9 movable rod 10 gate cut section

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 一対の型板間に成形品のキャビティが形
成され、一方の型板内に樹脂注入孔を経て上記キャビテ
ィに連通する樹脂通路が設けられ、かつこの樹脂通路内
に軸方向に移動可能に可動ロッドが配置され、この可動
ロッドの先端で上記樹脂注入孔を開閉する射出成形金
型において、 上記樹脂注入孔に連通されたキャビティの側部と樹脂溜
り部との間にゲートが設けられ、 かつ上記可動ロッドの先端に、可動ロッドが樹脂注入孔
に挿入されて樹脂注入孔を閉鎖した状態で他方の型板の
ゲート面に当接して上記ゲートを閉鎖する先細状のゲー
トカット部が形成され このゲートカット部のキャビティ側の面が該部の成形品
形状とさ れたことを特徴とする射出成形金型。
1. A cavity of a molded product is formed between a pair of mold plates, a resin passage communicating with the cavity through a resin injection hole is provided in one mold plate, and an axial direction is formed in the resin passage. movably movable rod is disposed in the injection mold for opening and closing the resin injection hole at the tip end of the movable rod, the cavity communicating with the said resin injection hole side and the resin reservoir
A gate is provided between the movable rod and a resin injection hole at the tip of the movable rod.
Into the other mold plate with the resin injection hole closed.
Is in contact with tapered gate cut portion for closing the gate is formed on the gate surface, the molded article cavity side surface of the gate cut portion is the portion of the
Injection mold, characterized in that it is shaped.
JP04268947A 1992-10-07 1992-10-07 Injection mold Expired - Fee Related JP3125468B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04268947A JP3125468B2 (en) 1992-10-07 1992-10-07 Injection mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04268947A JP3125468B2 (en) 1992-10-07 1992-10-07 Injection mold

Publications (2)

Publication Number Publication Date
JPH06114892A JPH06114892A (en) 1994-04-26
JP3125468B2 true JP3125468B2 (en) 2001-01-15

Family

ID=17465503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04268947A Expired - Fee Related JP3125468B2 (en) 1992-10-07 1992-10-07 Injection mold

Country Status (1)

Country Link
JP (1) JP3125468B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008097912A (en) * 2006-10-10 2008-04-24 Stanley Electric Co Ltd Projection lens for vehicle headlight which uses semiconductor light-emitting element as light source

Also Published As

Publication number Publication date
JPH06114892A (en) 1994-04-26

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