JPH0546899Y2 - - Google Patents
Info
- Publication number
- JPH0546899Y2 JPH0546899Y2 JP1988043965U JP4396588U JPH0546899Y2 JP H0546899 Y2 JPH0546899 Y2 JP H0546899Y2 JP 1988043965 U JP1988043965 U JP 1988043965U JP 4396588 U JP4396588 U JP 4396588U JP H0546899 Y2 JPH0546899 Y2 JP H0546899Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- hole
- movable
- stamper
- gas
- 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
- 238000001746 injection moulding Methods 0.000 claims description 4
- 238000013022 venting Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 238000000465 moulding Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はビデオデイスク、オーデイオデイスク
等の記録媒体用デイスクを成形するための射出成
形機の金型に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold for an injection molding machine for molding disks for recording media such as video disks and audio disks.
（従来の技術）
射出成形機によつて成形する場合、溶融樹脂
は、固定側金型の中央に設けられたスプルブツシ
ユから金型キヤビテイの中央部に射出され、射出
された溶融樹脂は放射状に拡散して金型キヤビテ
イに充填される。(Prior art) When molding is performed using an injection molding machine, molten resin is injected into the center of the mold cavity from a sprue bush provided at the center of the stationary mold, and the injected molten resin is diffused radially. and then filled into the mold cavity.
他方金型キヤビテイ内の空気と溶融樹脂から発
生したガス（以下単にガスという。）は、溶融樹
脂によつて金型キヤビテイの外周方向に移動させ
られ、金型の外周縁部に設けられた微小間隙から
金型キヤビテイ外に流出する。しかしこのように
金型キヤビテイ外に排出されるのはガスの一部
で、残りのガスは排出されることなく金型キヤビ
テイ内に残存する。 On the other hand, the gas generated from the air and molten resin in the mold cavity (hereinafter simply referred to as gas) is moved by the molten resin toward the outer periphery of the mold cavity, It flows out of the mold cavity through the gap. However, only a portion of the gas is discharged outside the mold cavity in this way, and the remaining gas remains within the mold cavity without being discharged.
上記のごとく金型キヤビテイ内にガスが残存す
ると、第４図に示すように、成形品Ａの開口部周
辺に山形状のガスマークＢが生ずる。このガスマ
ークＢには情報を入力することができず、したが
つてガスマークＢがリードインＣに達した成形品
は成形不良として処理される。 If gas remains in the mold cavity as described above, a mountain-shaped gas mark B is generated around the opening of the molded product A, as shown in FIG. No information can be input to this gas mark B, and therefore, a molded product in which gas mark B reaches lead-in C is treated as a molding defect.
そこで、金型内の中央に、キヤビテイー内に頭
部が突出しないように設けた突き出しピンの周囲
に間隙を設けてキヤビテイー内を金型外と連通し
てキヤビテイー内のガスを逸出させようとするも
のが知られている（実公昭42−5109号公報参照）。
また、スタンパホルダと位置決めスリーブとの間
に間隙を設け、この間隙からエジエクトエアを吹
出し、残存するエアを金型外に放出する手段を設
けたものも知られている（特開昭60−11326号公
報参照）。 Therefore, an attempt was made to create a gap around the ejector pin, which was installed in the center of the mold so that the head would not protrude into the cavity, to communicate the inside of the cavity with the outside of the mold and allow the gas inside the cavity to escape. It is known to do so (see Utility Model Publication No. 42-5109).
There is also a known device in which a gap is provided between the stamper holder and the positioning sleeve, and a means is provided to blow out eject air from this gap and release the remaining air to the outside of the mold (Japanese Patent Laid-Open No. 60-11326). (see official bulletin).
（考案が解決しようとする課題）
可動側金型中央部の外方にスタンパを保持する
ためのつばが固定金型側に膨出して形成されてい
るので、つばの外周部分にガスが残留し、図５に
示すように、つばの外周側面に溶融樹脂Ｃが充分
拡散されないため、従来の技術ではガスマークの
発生を防ぐことができなかつた。(Problem to be solved by the invention) Since the collar for holding the stamper is formed outside the center of the movable mold to bulge toward the fixed mold side, gas remains on the outer periphery of the collar. As shown in FIG. 5, the molten resin C is not sufficiently diffused on the outer circumferential side of the brim, so the conventional technology has not been able to prevent the occurrence of gas marks.
そこで本考案は、上記問題点に鑑みキヤビテイ
内のガスを確実に排出し、ガスマークの発生を抑
止することのできる射出成形機の金型を提供する
こと目的とする。 SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a mold for an injection molding machine that can reliably exhaust the gas in the cavity and prevent the occurrence of gas marks.
（課題を解決するための手段）
上記目的を達成するための本考案の固有の構成
は次のとおりである。(Means for Solving the Problems) The unique configuration of the present invention for achieving the above object is as follows.
可動側金型に一端が空孔に連通するとともに他
端が外気に連通する貫通孔を形成し、スタンパ押
えの外周面を軸線方向に面取りして複数の平端部
を形成し、空孔にスタンパ押えを嵌合して平端部
と空孔内面の間に形成された間隙の一端が金型キ
ヤビテイに連通するとともに他端が貫通孔に連通
するガス抜き溝部を形成したものである。 A through hole is formed in the movable mold, one end of which communicates with the hole, and the other end of which communicates with the outside air, the outer peripheral surface of the stamper holder is chamfered in the axial direction to form a plurality of flat ends, and the stamper is inserted into the hole. One end of the gap formed between the flat end and the inner surface of the hole by fitting the presser foot communicates with the mold cavity, and the other end communicates with the through hole, forming a gas vent groove.
（作用）
金型キヤビテイに射出された溶融樹脂は、金型
キヤビテイの外周部方向に拡散し、これとともに
ガスの一部は金型の微小間隙から金型キヤビテイ
外に流出する一方、残部のガスは、スタンパ押え
の外周壁に形成されたガス抜き溝部と可動側金型
に形成された貫通孔とを通つて外部に流出する。(Function) The molten resin injected into the mold cavity diffuses toward the outer periphery of the mold cavity. At the same time, part of the gas flows out of the mold cavity through the micro gaps in the mold, while the remaining gas The gas flows out through the gas vent groove formed in the outer circumferential wall of the stamper holder and the through hole formed in the movable mold.
（考案の効果）
上記のごとく金型の微小間隙から排出されない
ガスはガス抜き溝部から排出されるため、金型キ
ヤビテイ内にガスが残存することがなく、このた
め成形デイスクにガスマークが生ずることがな
い。(Effect of the invention) As mentioned above, the gas that is not exhausted from the minute gap in the mold is exhausted from the gas vent groove, so no gas remains in the mold cavity, which prevents gas marks from forming on the molding disk. There is no.
さらに射出初速を落すことなくガスマークの発
生をなくすことができるので、成形サイクルが長
くなることもなく、また成形デイスクの複屈折率
が大きくなることもない。 Furthermore, since the occurrence of gas marks can be eliminated without reducing the initial injection speed, the molding cycle does not become long and the birefringence of the molded disk does not increase.
（実施例）
以下本考案の実施例を図面を参照しながら説明
する。第１図において、１は固定側金型、２は可
動側金型で、固定側金型１は図示しない可動盤に
固定され、可動側金型２は図示しない固定盤にそ
れぞれ固定されていて、可動側金型２は固定側金
型１に対して前後進可能になつている。３はスタ
ンパで、可動側金型２のキヤビテイ面に設けられ
ている。この可動側金型２の中央部には、同金型
２の軸線方向にのびる空孔４が形成され、空孔４
に略載頭円錐体状のスタンパ押え５が嵌合されて
いる。(Example) Examples of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a fixed mold, and 2 is a movable mold. The fixed mold 1 is fixed to a movable platen (not shown), and the movable mold 2 is fixed to a fixed platen (not shown). , the movable mold 2 is movable back and forth relative to the fixed mold 1. 3 is a stamper, which is provided on the cavity surface of the movable mold 2. A hole 4 extending in the axial direction of the movable mold 2 is formed in the center of the movable mold 2.
A stamper holder 5 having a substantially truncated cone shape is fitted into the stamper holder 5 .
第２図はスタンパ押え５を示すもので、スタン
パ押え５の一端部には外方に張り出す保持つば６
が形成され、またスタンパ押え５の他端部にはね
じ部７が形成されている。さらにスタンパ押え５
の曲面をなす側周面は第３図にも示すように軸線
方向に面取りされ、複数の平坦部８が形成されて
いる。第３図に示すようにこの平坦部８は軸対称
に六面形成するのが好ましい。すなわちこのよう
にスタンパ押え５の周面を面取りすることによ
り、スタンパ押え５には平坦部８と曲面部９とが
交互に形成されることになる。そして後記するよ
うに、スタンパ押え５を可動側金型２の空孔４に
嵌合した際、曲面部９が空孔４の内面に密接し、
他方平坦部８と空孔４の内面とには間隙１０が形
成される。この間隙１０はガス抜き溝部を形成す
る。 FIG. 2 shows the stamper holder 5, and one end of the stamper holder 5 has a holding collar 6 that projects outward.
A threaded portion 7 is formed at the other end of the stamper holder 5. Furthermore, stamper presser 5
As shown in FIG. 3, the curved side circumferential surface is chamfered in the axial direction to form a plurality of flat portions 8. As shown in FIG. 3, this flat portion 8 is preferably formed into six axially symmetrical faces. That is, by chamfering the circumferential surface of the stamper holder 5 in this manner, the stamper holder 5 is alternately formed with flat portions 8 and curved portions 9. As will be described later, when the stamper holder 5 is fitted into the hole 4 of the movable mold 2, the curved surface portion 9 comes into close contact with the inner surface of the hole 4,
On the other hand, a gap 10 is formed between the flat portion 8 and the inner surface of the hole 4 . This gap 10 forms a gas vent groove.
１２はスタンパ押え５の基部に形成されたガス
集合部で、ガス抜き溝部とねじ部７との間に形成
された環状の溝部からなつている。このようなス
タンパ押え５を可動側金型２の空孔４に取り付け
るには、スタンパ３を可動側金型２のキヤビテイ
面上に配設した後、スタンパ押え５をスタンパ３
の中央開口部から挿入して空孔４に嵌合し、ねじ
部７を空孔４に形成したねじ部にねじ込む。この
状態でスタンパ押え５の保持つば６とスタンパ３
の開口部１３周辺とは相対面し間隙１４が形成さ
れる。 Reference numeral 12 denotes a gas collecting portion formed at the base of the stamper holder 5, which is an annular groove formed between a gas venting groove and the threaded portion 7. To attach such a stamper holder 5 to the hole 4 of the movable mold 2, the stamper 3 is placed on the cavity surface of the movable mold 2, and then the stamper holder 5 is attached to the stamper 3.
It is inserted through the central opening of the hole 4 and fitted into the hole 4, and the threaded portion 7 is screwed into the threaded portion formed in the hole 4. In this state, the holding collar 6 of the stamper holder 5 and the stamper 3
A gap 14 is formed facing the periphery of the opening 13 .
１２ａは可動側金型２に形成された第１貫通
孔、１２ｂは後述する可動側保持部材２２に形成
された第２貫通孔で、第１貫通孔１２ａの一端は
スタンパ押え５のガス滞留部１２に連通するとと
もに同貫通孔１２ａの他端は第２貫通孔１２ｂに
連通している。すなわちガス集合部は第１および
第２貫通孔１２ａ，１２ｂを介して外気と連通し
ている。 12a is a first through hole formed in the movable mold 2, 12b is a second through hole formed in the movable holding member 22, which will be described later, and one end of the first through hole 12a is a gas retention part of the stamper holder 5. 12, and the other end of the through hole 12a communicates with a second through hole 12b. That is, the gas collecting portion communicates with the outside air via the first and second through holes 12a and 12b.
１５は環状の外周リングで、可動側金型２の外
周部に形成された環状溝１６に固定されている。
外周リング１５には内方に張り出すフランジ部１
５ａが形成され、このフランジ部１５ａはスタン
パ３の外周部に対し隙間１７をおいて相対面して
いる。また外周リング１５の内周面はスタンパ３
の外周面３ａに当接してスタンパ３を保持してい
る。固定側金型１の中央部には突部１８が形成さ
れ、突部１８は型閉時に外周リング１５のフラン
ジ部１５ａに達しかつフランジ部１５ａの内周面
とこの突部１８の外周面とには隙間１９が形成さ
れ、さらにフランジ部１５ａの前端面と固定側金
型１とにも間隙２０が形成されるようになつてい
る。 Reference numeral 15 denotes an annular outer circumference ring, which is fixed in an annular groove 16 formed on the outer circumference of the movable mold 2 .
The outer ring 15 has a flange portion 1 that extends inward.
5a is formed, and this flange portion 15a faces the outer peripheral portion of the stamper 3 with a gap 17 in between. In addition, the inner circumferential surface of the outer circumferential ring 15 is
The stamper 3 is held in contact with the outer peripheral surface 3a of the stamper 3. A protrusion 18 is formed in the center of the stationary mold 1, and the protrusion 18 reaches the flange 15a of the outer ring 15 when the mold is closed, and the inner circumferential surface of the flange 15a and the outer circumferential surface of the protrusion 18 meet. A gap 19 is formed between the flange portion 15a and a gap 20 between the front end surface of the flange portion 15a and the stationary mold 1.
２１は固定側金型１に取り付けられた固定側保
持部材、２２は可動側金型２に取り付けられ前述
の可動側保持部材で、型締時にこれら保持部材２
１，２２が互いに当接して型締力を支持すること
により固定側金型１と可動側金型２とに前記のよ
うな間隙２０が形成される。２３は固定側金型１
に設けられたスプルブツシユである。 21 is a fixed side holding member attached to the fixed side mold 1, 22 is the above-mentioned movable side holding member attached to the movable side mold 2, and these holding members 2 are attached to the movable side mold 2 during mold clamping.
1 and 22 come into contact with each other and support the mold clamping force, thereby forming the gap 20 between the stationary mold 1 and the movable mold 2. 23 is fixed side mold 1
This is a sprue bush installed in the.
つぎに上記構成に係る金型の作用について述べ
る。このような金型を用いて成形を行うには固定
側金型１に対し可動側金型２を前進させて型締を
行つた後、スプルブツシユ２３から金型キヤビテ
イに溶融樹脂を射出する。射出された溶融樹脂は
放射状に広がり金型キヤビテイ内に充填される。 Next, the operation of the mold according to the above configuration will be described. To perform molding using such a mold, the movable mold 2 is moved forward relative to the fixed mold 1 and the mold is clamped, and then molten resin is injected from the sprue bush 23 into the mold cavity. The injected molten resin spreads radially and fills the mold cavity.
他方金型キヤビテイ内のガスは溶融樹脂の移動
にともない間隙１９，２０から金型キヤビテイ外
に流出するが、間隙１９，２０から流出しないガ
スはスタンパ押え５の間隙１０に流入する。すな
わち金型キヤビテイ内のガスは、隙間１４内に流
入しさらに間隙１０を通つてガス集合部にいた
り、ここから第１および第２貫通孔１２ａ，１２
ｂを経て外部に流出する。 On the other hand, the gas inside the mold cavity flows out of the mold cavity through the gaps 19 and 20 as the molten resin moves, but the gas that does not flow out from the gaps 19 and 20 flows into the gap 10 of the stamper holder 5. That is, the gas in the mold cavity flows into the gap 14, passes through the gap 10, reaches the gas collection part, and from there flows into the first and second through holes 12a, 12.
It flows out through b.
第１図は本考案に係る金型の断面図、第２図は
スタンパ押えの斜視図、第３図は第２図のＡ−Ａ
線における拡大断面図、第４図は従来の金型によ
つて成形されたデイスクの平面図、第５図は従来
の金型の溶融樹脂が射出されてキヤビテイ内にガ
スが残留する様子を示す拡大摸式図である。
１……固定側金型、２……可動側金型、３……
スタンパ、４……空孔、５……スタンパ押え、６
……保持つば、１０……間隙（ガス抜き溝部）、
１２ａ……第１貫通孔、１２ｂ……第２貫通孔。
Fig. 1 is a sectional view of the mold according to the present invention, Fig. 2 is a perspective view of the stamper holder, and Fig. 3 is A-A in Fig. 2.
Fig. 4 is a plan view of a disk molded by a conventional mold, and Fig. 5 shows gas remaining in the cavity after molten resin is injected from the conventional mold. It is an enlarged schematic diagram. 1...Fixed side mold, 2...Movable side mold, 3...
Stamper, 4... Hole, 5... Stamper holder, 6
...holding collar, 10...gap (gas vent groove),
12a...first through hole, 12b...second through hole.
Claims (1)
盤とを設け、 該固定盤に固定側金型を固定するとともに該可
動盤に可動側金型を固定し、 該可動側金型のキヤビテイ面にスタンパを設
け、 さらに該可動側金型に空孔を形成し、 該空孔に載頭円錐体状のスタンパ押えを嵌合し
て、該スタンパ押えの保持つばを該スタンパ押え
の開口部周辺に対面させ、 前記可動側金型に一端が前記空孔に連通すると
ともに他端が外気に連通する貫通孔を形成し、 しかも、前記スタンパ押えの側周面を軸線方向
に面取りして複数の平端部を形成し、前記空孔に
前記スタンパ押えを嵌合した状態において平端部
と空孔内面の間に形成される間隙の一端が金型キ
ヤビテイに連通するとともに他端が前記貫通孔に
連通するガス抜き溝部を形成したことを特徴とす
る射出成形機の金型。[Scope of Claim for Utility Model Registration] A fixed platen and a movable platen that can move forward and backward relative to the fixed platen are provided, and the fixed side mold is fixed to the fixed platen, and the movable side mold is fixed to the movable platen. A stamper is provided on the cavity surface of the movable mold, a hole is formed in the movable mold, and a truncated cone-shaped stamper holder is fitted into the hole. A holding collar is made to face the periphery of the opening of the stamper holder, and a through hole is formed in the movable mold, one end communicating with the hole and the other end communicating with the outside air, and the side periphery of the stamper holder The surface is chamfered in the axial direction to form a plurality of flat ends, and when the stamper holder is fitted into the hole, one end of the gap formed between the flat end and the inner surface of the hole communicates with the mold cavity. A mold for an injection molding machine, characterized in that a gas venting groove is formed at the other end of the mold and the other end communicates with the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988043965U JPH0546899Y2 (en) | 1988-03-31 | 1988-03-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988043965U JPH0546899Y2 (en) | 1988-03-31 | 1988-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01146923U JPH01146923U (en) | 1989-10-11 |
| JPH0546899Y2 true JPH0546899Y2 (en) | 1993-12-09 |
Family
ID=31270346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988043965U Expired - Lifetime JPH0546899Y2 (en) | 1988-03-31 | 1988-03-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0546899Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6011326A (en) * | 1983-07-01 | 1985-01-21 | Hitachi Ltd | Mold |
-
1988
- 1988-03-31 JP JP1988043965U patent/JPH0546899Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6011326A (en) * | 1983-07-01 | 1985-01-21 | Hitachi Ltd | Mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01146923U (en) | 1989-10-11 |
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