JPS63237921A - Injection mold for disk - Google Patents
Injection mold for diskInfo
- Publication number
- JPS63237921A JPS63237921A JP7227987A JP7227987A JPS63237921A JP S63237921 A JPS63237921 A JP S63237921A JP 7227987 A JP7227987 A JP 7227987A JP 7227987 A JP7227987 A JP 7227987A JP S63237921 A JPS63237921 A JP S63237921A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- punch
- sleeve
- mold
- tip
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims description 10
- 239000007924 injection Substances 0.000 title claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 abstract description 15
- 239000000057 synthetic resin Substances 0.000 abstract description 15
- 229920005989 resin Polymers 0.000 abstract 3
- 239000011347 resin Substances 0.000 abstract 3
- 238000009499 grossing Methods 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
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
- 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
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ビデオディスク、オーディオディスク等の記
録媒体用ディスク（以下、ディスクと云う、）を成形す
るためのディスク用射出成形金型に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disk injection mold for molding recording medium disks (hereinafter referred to as disks) such as video disks and audio disks.
（従来の技術）
従来、ディスクを成形するに当っては、例えば第２図に
示す固定金型２１と可動金型２２とで形成されるキャビ
ティ２３にスプルブツシュ２４を通して射出される合成
樹脂２５を充填してつくられる。溶融した合成樹脂２５
が固定金型２１の中央に設けたスプルブツシュ２４から
キャビティ２３の中心に射出されるとき、合成樹脂２５
はキャビティ２３内に放射状に拡散し、ついにはキャビ
ティ２３内を充満する。(Prior Art) Conventionally, when molding a disk, for example, a cavity 23 formed by a fixed mold 21 and a movable mold 22 shown in FIG. 2 is filled with synthetic resin 25 injected through a sprue bush 24. It is made by Melted synthetic resin 25
When the synthetic resin 25 is injected from the sprue bush 24 provided at the center of the fixed mold 21 into the center of the cavity 23, the synthetic resin 25
diffuses radially into the cavity 23 and finally fills the cavity 23.
一方キャビティ２３内の空気は射出された合成樹脂によ
り漸次キャビティ２３の外周縁方向に追われ、ついには
その外周縁に設けられた極小間隙を通ってキャビティ２
３外に押出される。キャビティ２３内に射出された合成
樹脂の固化を待って、ポンチ２６によって中央部を開口
した後、金型からディスクとして取出される。２７はス
タンパで、ディスクの表面に信号等を賦形するためのも
のである。On the other hand, the air inside the cavity 23 is gradually chased toward the outer periphery of the cavity 23 by the injected synthetic resin, and finally passes through the extremely small gap provided at the outer periphery and enters the cavity 2.
3 is pushed out. After waiting for the synthetic resin injected into the cavity 23 to solidify, the central portion is opened with a punch 26 and then taken out as a disk from the mold. 27 is a stamper for imprinting signals and the like on the surface of the disk.
（発明が解決しようとする問題点）
上記円盤状のキャビティ２３で成形された合成樹脂２５
は型抜きをするまえにポンチ２６で孔をあけるため、ス
プルブツシュ２４とポンチ２６とで画定するゲートの巾
はキャビティ２３の圧みよりも薄く形成するためポンチ
２６の先端部はキャビティ２３の内部に突出した状態に
なっている。(Problem to be solved by the invention) Synthetic resin 25 molded in the disc-shaped cavity 23
Since the hole is punched with the punch 26 before cutting, the width of the gate defined by the sprue bush 24 and the punch 26 is formed to be thinner than the pressure of the cavity 23, so the tip of the punch 26 is inside the cavity 23. It is in a prominent state.
ポンチ２６の先端部周辺は合成樹脂流の流路の死角（淵
）になり、射出充填時には、この死角にあるエアまたは
ガス２９はスムーズにキャビティ２３の外周縁に向って
押し出されず１合成樹脂の充填最終段階にあたる射出保
持圧でキャビティ２３に圧力をかけたとき、ガス２９は
周りを充填された合成樹脂２５で取り囲まれて、エア抜
きから逃げることができない、このため、合成樹脂２５
に、スタンバ−ホルダ２８の外局面に山状のシルバー３
０を形成する（第３図参照）、シルバー３０がディスク
３１のリードイン３２まで発達すると情報入力不能とな
り、不良品となる。また、それを防止するためには射出
充填速度をかなり遅くしなければならず、このため作業
時間が延長し、しかも射出充填速度を変えることは成形
品の複屈折に影響をおよぼす。The area around the tip of the punch 26 becomes a blind spot (edge) in the synthetic resin flow path, and during injection and filling, the air or gas 29 in this blind spot is not smoothly pushed out toward the outer periphery of the cavity 23 and is When pressure is applied to the cavity 23 at the injection holding pressure that corresponds to the final stage of filling, the gas 29 is surrounded by the filled synthetic resin 25 and cannot escape from the air bleed.
There is a mountain-like silver 3 on the outer surface of the stanbar holder 28.
0 (see FIG. 3), and when the silver 30 develops to the lead-in 32 of the disk 31, it becomes impossible to input information and the product becomes defective. In addition, in order to prevent this, the injection filling speed must be considerably slowed down, which increases the working time, and changing the injection filling speed affects the birefringence of the molded product.
本発明は以上の事項を鑑みて、シルバーのない整形され
たディスクを得るためのディスク用射出成形金型を提供
する。In view of the above, the present invention provides an injection mold for a disc for obtaining a shaped disc without silver.
（問題点を解決するための手段）
本発明は、上記目的を達成するために、キャビティを形
成する一方の金型の中央部に突出して位置するポンチの
先端外周面に当接するスリーブを設け、該スリーブの先
端面に前記金型のキャビティを画定する面とポンチの先
端面とが滑らかな連続面を有するような曲面を形成した
ことを特徴とする構成としたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a sleeve that abuts the outer peripheral surface of the tip of the punch that is located protrudingly in the center of one of the molds forming the cavity, This structure is characterized in that a curved surface is formed on the tip end surface of the sleeve so that the surface defining the cavity of the mold and the tip end surface of the punch have a smooth continuous surface.
（作 用）
キャビティ内部のポンチの先端表面とスリーブとは滑ら
かな一面になってキャビティに続いているので、射出さ
れた合成樹脂はポンチの先端面にあたり放射状に拡がっ
ていくが、キャビティまでは滑らかな面になっており、
スリーブの金型との接辺も段差なく連続になっているの
で、空気溜りを形成することなく滑らかに充填される。(Function) The tip surface of the punch inside the cavity and the sleeve form a smooth surface that continues into the cavity, so the injected synthetic resin hits the tip surface of the punch and spreads radially, but it is smooth until it reaches the cavity. It has a
The contact side of the sleeve with the mold is also continuous without any steps, so it can be filled smoothly without forming air pockets.
（実施例） 本発明の実施例を第１図に基づいて説明する。(Example) An embodiment of the present invention will be described based on FIG.
図において、ｌは固定金型、２は可動金型であり、これ
らを型締した状態でディスク形状のキャビティ３を形成
し、固定金型１の中央部には合成樹脂４を射出するスプ
ルブツシュ５が設けられており、可動４、金型２の中央
部にはスリーブ６を介してポンチ７が摺動自在に設けら
れている。スリーブ６は突出しているポンチ７の上面（
刃型面）と連続した滑らかな一面１０を形成しており、
また、キャビティを画定する一面である可動金型２の面
とも滑らかに連続している。８はスタンバであり、スタ
ンバ−ホルダ９により可動金型２に支持されている。In the figure, 1 is a fixed mold, 2 is a movable mold, and when these molds are clamped, a disc-shaped cavity 3 is formed, and in the center of the fixed mold 1 is a sprue bush 5 for injecting synthetic resin 4. A punch 7 is slidably provided in the center of the movable mold 4 and the mold 2 via a sleeve 6. The sleeve 6 is attached to the protruding upper surface of the punch 7 (
It forms a smooth surface 10 that is continuous with the blade shape surface),
It also smoothly continues with the surface of the movable mold 2, which is one surface that defines the cavity. Reference numeral 8 denotes a stand bar, which is supported by the movable mold 2 by a stand bar holder 9.
スリーブ６をポンチ７の突出面と可動金型２の表面とが
連続した面になっているため、射出された合成樹脂は曲
面にそって放射状に拡がっていくので淀みなくキャビテ
ィに充填される。Since the sleeve 6 has a continuous surface between the protruding surface of the punch 7 and the surface of the movable mold 2, the injected synthetic resin spreads radially along the curved surface and is filled into the cavity without stagnation.
そして、ポンチが中央部を開口するため前進すると、ス
プルブツシュは後退する。Then, when the punch moves forward to open the center part, the sprue bush retreats.
なお、スリーブの形状は、ポンチの外周面と滑らかにな
っていてもよい。Note that the shape of the sleeve may be smooth with the outer peripheral surface of the punch.
（発明の効果）
本発明は、以上のように構成されるものであるから、合
成樹脂の流れは滑らかになり、射出時において、エアや
ガスをキャビティ内に閉じ込めることなしに充填できる
ので、一定量の合成樹脂はキャビティ内に充満され歪の
ないディスクが得られる。(Effects of the Invention) Since the present invention is configured as described above, the flow of the synthetic resin becomes smooth, and air or gas can be filled into the cavity without being trapped during injection, so that the flow is constant. The amount of synthetic resin is filled into the cavity to obtain a distortion-free disk.
第１図は本発明の一実施例でするディスク用射出成形金
型の断面図、第２図は従来技術の説明図、第３図は従来
技術で成形された不良ディスクの説明図である。
２ ・・・ 可動金型（金型）
３ ・・・ キャビティ
６ ・・・ スリーブ
７ ・・・ ポンチ
第１図
２・・可動金型〔金型）
３・・・’Ｉ−Ｐビフィ
６・・スリーブ
７・・ポンチ
第３図FIG. 1 is a cross-sectional view of an injection mold for a disc according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a conventional technique, and FIG. 3 is an explanatory diagram of a defective disk molded by the conventional technique. 2... Movable mold (mold) 3... Cavity 6... Sleeve 7... Punch Figure 1 2... Movable mold (mold) 3...'I-P Biffy 6.・Sleeve 7...Punch Figure 3
Claims (1)
置するポンチの先端外周面に当接するスリーブを設け、
該スリーブの先端面に前記金型のキャビティを画定する
面とポンチの先端面とが滑らかな連続面を有するような
曲面を形成したことを特徴とするディスク用射出成形金
型。A sleeve is provided that comes into contact with the outer peripheral surface of the tip of the punch that protrudes from the center of one of the molds that forms the cavity.
An injection mold for a disk, characterized in that a curved surface is formed on the tip end surface of the sleeve so that the surface defining the cavity of the mold and the tip end surface of the punch have a smooth continuous surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227987A JPS63237921A (en) | 1987-03-26 | 1987-03-26 | Injection mold for disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227987A JPS63237921A (en) | 1987-03-26 | 1987-03-26 | Injection mold for disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63237921A true JPS63237921A (en) | 1988-10-04 |
| JPH0367853B2 JPH0367853B2 (en) | 1991-10-24 |
Family
ID=13484687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7227987A Granted JPS63237921A (en) | 1987-03-26 | 1987-03-26 | Injection mold for disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63237921A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01156021U (en) * | 1988-04-08 | 1989-10-26 | ||
| US5340303A (en) * | 1993-07-20 | 1994-08-23 | Galic Maus Ventures | Faster cycling sprue for centerhole - tearout optical disk injection molds |
| US5545365A (en) * | 1993-11-15 | 1996-08-13 | Meiki Co., Ltd. | Method for molding a disc with a central aperture |
| US5738886A (en) * | 1995-08-07 | 1998-04-14 | Kabushiki Kaisha Meiki Seisakusho | Mold for disk substrate |
| EP2095928A4 (en) * | 2006-11-29 | 2011-03-02 | Sumitomo Heavy Industries | Disc forming die, disc substrate and method for forming the disc substrate |
-
1987
- 1987-03-26 JP JP7227987A patent/JPS63237921A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01156021U (en) * | 1988-04-08 | 1989-10-26 | ||
| US5340303A (en) * | 1993-07-20 | 1994-08-23 | Galic Maus Ventures | Faster cycling sprue for centerhole - tearout optical disk injection molds |
| US5545365A (en) * | 1993-11-15 | 1996-08-13 | Meiki Co., Ltd. | Method for molding a disc with a central aperture |
| US5738886A (en) * | 1995-08-07 | 1998-04-14 | Kabushiki Kaisha Meiki Seisakusho | Mold for disk substrate |
| EP2095928A4 (en) * | 2006-11-29 | 2011-03-02 | Sumitomo Heavy Industries | Disc forming die, disc substrate and method for forming the disc substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0367853B2 (en) | 1991-10-24 |
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