JP2707676B2 - Mold - Google Patents
MoldInfo
- Publication number
- JP2707676B2 JP2707676B2 JP1798689A JP1798689A JP2707676B2 JP 2707676 B2 JP2707676 B2 JP 2707676B2 JP 1798689 A JP1798689 A JP 1798689A JP 1798689 A JP1798689 A JP 1798689A JP 2707676 B2 JP2707676 B2 JP 2707676B2
- Authority
- JP
- Japan
- Prior art keywords
- punch
- gate
- cavity
- sprue
- disk gate
- 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
Links
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
- B29C45/38—Cutting-off equipment for sprues or ingates
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はディスクゲートを有し、前記ディスクゲート
を型内で切断する樹脂成形金型に関する。Description: TECHNICAL FIELD The present invention relates to a resin molding die having a disk gate and cutting the disk gate in a mold.
従来の技術 従来この種樹脂成形金型は第３図に示す様にキャビテ
ィ13にディスクゲート12およびスプルー11を接続し、デ
ィスクゲート２の直下にパンチ14を配置する構成になっ
ていた。2. Description of the Related Art Conventionally, this type of resin molding die has a configuration in which a disk gate 12 and a sprue 11 are connected to a cavity 13 and a punch 14 is disposed directly below the disk gate 2 as shown in FIG.
そしてこの様な構成において、キャビティ13に樹脂を
充填完了した後パンチ14を前進させ、パンチ先端面14a
とキャビティ面15との間に存在する溶融樹脂をスプルー
11又はキャビティ13へ排除することによって型内でゲー
ト処理しようとするものであった。In such a configuration, after the cavity 13 is completely filled with the resin, the punch 14 is advanced, and the punch tip surface 14a
Sprue the molten resin existing between
It was intended to gate in the mold by removing to 11 or cavity 13.
発明が解決しようとする課題 しかしながら上記のような構成ではパンチ前進時点に
おいてすでにキャビティ内の溶融樹脂は冷却固化を開始
しており、パンチ先端面とキャビティ面との間の溶融樹
脂はスプルー又はキャビティへ完全に排除することが困
難であることから、成形品のゲート部にバリが残留した
り、あるいは前記バリを毎ショットはさみ込むことから
パンチ先端面およびキャビティ面の損傷が著しく進行す
るという課題を有していた。However, in the above configuration, the molten resin in the cavity has already begun to cool and solidify at the time of advance of the punch, and the molten resin between the punch tip surface and the cavity surface is transferred to the sprue or the cavity. Since it is difficult to completely remove the burrs, there is a problem that burrs remain in the gate portion of the molded product, or that the burrs are inserted every shot, so that the damage to the punch tip surface and the cavity surface progresses remarkably. Was.
課題を解決するための手段 上記課題を解決するための本発明の技術的手段はキャ
ビティ面よりスプルー側に凹状に、その厚さを延長した
ディスクゲートと、前記ディスクゲートと対向して配置
され、その外径が前記ディスクゲート内径よりも小で前
記ディスクゲート内に前進可能なパンチと、前記パンチ
先端部に形成されたスラグウェル部と、前記パンチ内部
に摺動可能に配置されたエジェクターピンとからなるも
のである。Means for solving the problem The technical means of the present invention for solving the above-mentioned problem is a concave shape on the sprue side from the cavity surface, a disk gate whose thickness is extended, and disposed opposite to the disk gate, A punch whose outer diameter is smaller than the inner diameter of the disc gate and which can advance into the disc gate, a slag well formed at the tip of the punch, and an ejector pin slidably disposed inside the punch. It becomes.
作用 この技術的手段の作用は次の様になる。すなわちパン
チ前進初期においてはパンチ先端部とキャビティ面との
間に存在する溶融樹脂はスプルー又はキャビティへ排除
されるが、パンチ前進ストロークがゲート厚さを越える
とディスクゲート内に閉じ込められた溶融樹脂はスプル
ーへ更に排除され続け、この時点でディスクゲートはパ
ンチにより完全に剪断されることとなる。Operation The operation of this technical means is as follows. That is, in the initial stage of the advance of the punch, the molten resin existing between the tip of the punch and the cavity surface is removed to the sprue or the cavity. It continues to be rejected by the sprue, at which point the disk gate will be completely sheared by the punch.
実施例 以下本発明の一実施例を第１図に示し説明する。１は
スプルー、２はキャビティ面５よりスプルー側に向かっ
て凸に延長されたディスクゲート、３はキャビティ、４
はスリーブ状のパンチ、６はパンチ４の中心部に配置さ
れたスラグウェル、７はスラグウェル６を排出するため
のエジェクターピンである。Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 is a sprue, 2 is a disk gate protruding from the cavity surface 5 toward the sprue side, 3 is a cavity, 4
Is a sleeve-shaped punch, 6 is a slag well arranged at the center of the punch 4, and 7 is an ejector pin for discharging the slag well 6.
本図に示す状態でスプルー１、ディスクゲート２を通
過して溶融樹脂がキャビティ３に充填され、前記溶融樹
脂の冷却固化が進行しないうちにパンチ４をすばやく前
進させる。パンチ４の前進開始時にはディスクゲート２
内の溶融樹脂はスプルーへ逆流し、又１部はキャビティ
３へ更に流入するが、パンチ４がディスクゲート２の厚
さ以上に前進するとパンチ４によってディスクゲート２
とキャビティの３の間は閉塞され、ディスクゲート２か
らキャビティ３への溶融樹脂の流入は停止し、ディスク
ゲート２とキャビティ３とは型内で完全に分離される。In the state shown in this figure, the cavity 3 is filled with the molten resin through the sprue 1 and the disk gate 2, and the punch 4 is quickly advanced before the cooling and solidification of the molten resin proceeds. Disk gate 2 at the start of punch 4 advance
The molten resin inside flows back into the sprue and a part further flows into the cavity 3, but when the punch 4 moves forward beyond the thickness of the disk gate 2, the punch 4
The space between the cavity 3 and the cavity 3 is closed, the flow of the molten resin from the disk gate 2 into the cavity 3 is stopped, and the disk gate 2 and the cavity 3 are completely separated in the mold.
パンチ４が更に前進を続け前進限に到達するまでの
間、ディスクゲート２内の溶融樹脂はスプルー１へ流出
を続ける。スプルー1,ディスクゲート2,キャビティ３内
の樹脂が完全に冷却固化した状態で金型のパート部８を
開き、成形品及びディスクゲートを突出すと各々別々に
離型し、成形品のディスクゲート跡は平滑に仕上げられ
た状態になっている。The molten resin in the disk gate 2 continues to flow out to the sprue 1 until the punch 4 further advances and reaches the advance limit. When the resin in the sprue 1, the disc gate 2, and the resin in the cavity 3 are completely cooled and solidified, the mold part 8 is opened, and when the molded product and the disc gate are protruded, they are separated from each other, and the molded product disc gate is separated. The trace is in a smooth finished state.
第２図にピンポイントゲート９とディスクゲート２を
組合わせた他の実施例を示す。FIG. 2 shows another embodiment in which the pinpoint gate 9 and the disc gate 2 are combined.
発明の効果 本発明によればパンチによってディスクゲートが型内
で完全に剪断されるため成形品のゲート跡にバリが発生
せず、又、パンチがディスクゲート部を形成する金型面
に直接接触せず、かつバリ状の樹脂カスをはさむことも
無いためゲート部金型面及びパンチを損傷する可能性が
大巾に低減し金型寿命が延びるという効果がある。Effect of the Invention According to the present invention, the disc gate is completely sheared in the mold by the punch, so that burrs do not occur on the gate mark of the molded product, and the punch directly contacts the mold surface forming the disc gate portion. Since there is no burr-like resin residue, the possibility of damaging the gate mold surface and the punch is greatly reduced, and the mold life is extended.
第１図は本発明の一実施例の成形金型の要部断面図、第
２図は本発明の他の実施例の成形金型の要部断面図、第
３図は従来の成形金型の要部断面図である。 ２……ディスクゲート、４……パンチ、５……キャビテ
ィ面、６……スラグウェル、７……エジェクータピン。FIG. 1 is a cross-sectional view of a main part of a molding die according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a molding die of another embodiment of the present invention, and FIG. It is principal part sectional drawing of. 2 ... Disc gate, 4 ... Punch, 5 ... Cavity surface, 6 ... Slag well, 7 ... Ejector pin.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−67123（ＪＰ，Ａ) 特開 昭60−244516（ＪＰ，Ａ) 特開 平１−159221（ＪＰ，Ａ) 特開 平１−159222（ＪＰ，Ａ) 特開 平１−182018（ＪＰ，Ａ) 実開 平２−99615（ＪＰ，Ｕ) 実開 昭63−53719（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-67123 (JP, A) JP-A-60-244516 (JP, A) JP-A-1-159221 (JP, A) JP-A-1- 159222 (JP, A) JP-A-1-182018 (JP, A) JP-A-2-99615 (JP, U) JP-A-63-53719 (JP, U)
Claims (1)
の厚さを延長したディスクゲートと、前記ディスクゲー
トと対向して配置され、その外径が前記ディスクゲート
内径よりも小で前記ディスクゲート内に前進可能なパン
チと、前記パンチ先端部に形成されたスラグウェル部
と、前記パンチ内部に摺動可能に配置されたエジェクタ
ーピンとからなる成形金型。1. A disk gate having a thickness extended from a cavity surface toward a sprue side and facing the disk gate, wherein an outer diameter of the disk gate is smaller than an inner diameter of the disk gate, and And a slag well formed at the tip of the punch, and an ejector pin slidably disposed inside the punch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1798689A JP2707676B2 (en) | 1989-01-27 | 1989-01-27 | Mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1798689A JP2707676B2 (en) | 1989-01-27 | 1989-01-27 | Mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02198816A JPH02198816A (en) | 1990-08-07 |
| JP2707676B2 true JP2707676B2 (en) | 1998-02-04 |
Family
ID=11959047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1798689A Expired - Fee Related JP2707676B2 (en) | 1989-01-27 | 1989-01-27 | Mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707676B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3934775B2 (en) * | 1998-02-25 | 2007-06-20 | 富士フイルム株式会社 | Injection molding method and injection mold |
| DE50205054D1 (en) * | 2001-08-31 | 2005-12-29 | Netstal Maschinen Ag Naefels | METHOD AND DEVICE FOR AUTOMATIC PRODUCTION OF THIN PLATES |
| JP4511902B2 (en) * | 2004-10-19 | 2010-07-28 | バンドー化学株式会社 | Molding apparatus and molding method |
| JP4698551B2 (en) * | 2006-11-13 | 2011-06-08 | 日精樹脂工業株式会社 | Disc substrate molding method |
-
1989
- 1989-01-27 JP JP1798689A patent/JP2707676B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02198816A (en) | 1990-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081017 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |