JPS63295225A - Hot runner type injection molding apparatus - Google Patents
Hot runner type injection molding apparatusInfo
- Publication number
- JPS63295225A JPS63295225A JP13092887A JP13092887A JPS63295225A JP S63295225 A JPS63295225 A JP S63295225A JP 13092887 A JP13092887 A JP 13092887A JP 13092887 A JP13092887 A JP 13092887A JP S63295225 A JPS63295225 A JP S63295225A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- torpedo
- injection molding
- angle
- mold
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 17
- 239000011347 resin Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 239000011324 bead Substances 0.000 description 15
- 238000000465 moulding Methods 0.000 description 10
- 230000001154 acute effect Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 241000270708 Testudinidae Species 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野」
本発明は熔融樹脂の流通部にヒータを配し、樹脂を溶融
状態を保持しながら加圧流動させてゲート部を通して金
型キャビティに圧入させ成形を行うホットランナー式射
出成形装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method in which a heater is disposed in the flow section of the molten resin, and the resin is pressurized and flowed while maintaining the molten state, and is press-fitted into the mold cavity through the gate section. The present invention relates to a hot runner injection molding device that performs molding.
（発明の鷹要〕
本発明はホットランナー式射出成形装置であって、金型
のゲート部に臨むトービード先端部を３０゜以下の先鋭
角に形成することにより、ゲート開き角度を変更するこ
となくゲート部の樹脂流！ＩＪ部が拡大され、成形時に
おける樹脂流動が良好となり、低射出圧での成形かり能
となると共に成形品内の残留応力が小さく、成形歪の減
少を可能とするものである。(Summary of the Invention) The present invention is a hot runner type injection molding device, in which the toe bead tip facing the gate of the mold is formed at an acute angle of 30° or less, thereby eliminating the need to change the gate opening angle. Resin flow at the gate part! The IJ part has been enlarged to improve resin flow during molding, allowing for molding performance at low injection pressures, as well as reducing residual stress within the molded product and reducing molding distortion. It is.
〔従来の技術」
従来、ホットランナー式射出成形装置は、例えば実公昭
６０−１８９０４号公報に開示されるように、マニホー
ルドに形成した溶融樹脂流通部と金型のキャビティのゲ
ート部間の樹脂流通部内にヒータを内蔵した尖鋭発熱体
が、その先端部をゲート部に臨ませて配置されてランナ
ー内の樹脂を加熱して溶融状態に保持したり、ゲート部
分の固化樹脂を加熱して溶融し、ゲートを開いて射出樹
脂の間歇的な射出成形操作を行い溶融樹脂をキャビティ
内に射出注入して成形するように構成されている。[Prior Art] Conventionally, hot runner injection molding equipment has been used to control resin flow between a molten resin flow part formed in a manifold and a gate part of a mold cavity, as disclosed in, for example, Japanese Utility Model Publication No. 18904/1983. A sharp heating element with a built-in heater is placed with its tip facing the gate to heat the resin in the runner and maintain it in a molten state, or to heat and melt the solidified resin in the gate. , the gate is opened to perform intermittent injection molding operations of the injection resin, and the molten resin is injected into the cavity for molding.
この３１；うに構成されるホットランナー式射出成形装
置は前述の如くゲート部を開閉させるため尖鋭発熱体に
は先端の出来るだけ近くまでヒータを配する必要がある
。しかし、ヒータの熱効率からその大きさを小さくする
ことには限界があり、またヒータを先端に近づけるのも
発熱体の肉厚が薄くなり、強度的な限度もある。In the hot runner type injection molding apparatus constructed as shown in 31., in order to open and close the gate portion as described above, it is necessary to arrange the heater as close as possible to the tip of the sharp heating element. However, there is a limit to reducing the size of the heater due to its thermal efficiency, and moving the heater closer to the tip reduces the thickness of the heating element, which also limits its strength.
これらの条件を基ねそなえるためには尖鋭発熱体の尖鋭
先端部の先端部分は細くしてもその元部が太い円錐形状
となり、これに伴ってこの周囲に樹脂流動部を充分取る
ためにはゲート部の開き角である内側テーバ角を大きく
、即ち金型のゲート部のエッヂ角度を小さくする必要が
あるが、このエッヂ角度を小さくすると、この部分の金
型強度が低下することになり、このためゲート部の内側
テーバ角にも限界角度がある。In order to meet these conditions, even if the tip of the sharp tip of the sharp heating element is made thin, the base has a thick conical shape. It is necessary to increase the inner Taber angle, which is the opening angle of the gate part, that is, to reduce the edge angle of the gate part of the mold, but if this edge angle is made small, the mold strength in this part will decrease. Therefore, the inner Taber angle of the gate part also has a limit angle.
このように従来のホットランナー式射出成形装置におい
てはゲート部分に構造的に各種の制限が伴うので樹脂の
射出圧、ゲート切れ、ゲート開閉性の最適条件に対する
調整中が狭くそのため成形適応範囲が狭くなり、またゲ
ート部分の樹脂流動部が小狡であるため射出圧減衰が多
く装置のシリンダーの射出圧力を高める必要があり、こ
のことが原因で成形品内の残’、１′７応力が大きくな
って成形品に歪、即ち反り変形が生じるおそれがある。As described above, in conventional hot runner injection molding equipment, the gate part has various structural limitations, so the adjustment to the optimal conditions of resin injection pressure, gate cutting, and gate opening/closing performance is narrow, and therefore the applicable range of molding is narrow. In addition, since the resin flowing part at the gate part is delicate, the injection pressure is often attenuated and it is necessary to increase the injection pressure in the cylinder of the equipment, which causes a large residual stress in the molded product. As a result, there is a risk that the molded product will be distorted, that is, warped.
本発明はかかる点に漏み、ゲート部の開き角度、即ち、
内側テーバ角を変更することなくゲート部分の樹脂流動
部が拡大されて樹脂流動を良好にすると共にゲート部に
おける樹脂に対するトービードの熱効率を向上させるよ
うにしたホラ１−ランナ一式射出成形装置を堤供するこ
とを目的とする。The present invention addresses this point, and the opening angle of the gate part, that is,
To provide a one-runner complete injection molding device in which a resin flow part in a gate part is enlarged without changing the inner taper angle to improve resin flow and to improve the thermal efficiency of a toe bead with respect to resin in a gate part. The purpose is to
前述した問題を解決するために本発明は、熔融樹脂の流
通路からゲート部に連続して内部加熱形トービードを配
してなるホットランナー式射出成形装置において、１・
−ビードのゲート部に臨むトービード先端部を３０°以
下の先鋭角に形成し、ゲート部における樹脂流動エリア
を所要状態に設定できるようにしたものである。In order to solve the above-mentioned problems, the present invention provides a hot runner type injection molding apparatus in which an internally heated torpedo is disposed continuously from a molten resin flow path to a gate part.
- The tip of the toe bead facing the gate of the bead is formed at an acute angle of 30 degrees or less, so that the resin flow area at the gate can be set to a desired state.
〔作用」
ホットランナー式射出成形装置において、トービードの
ゲート部に臨むトービード先端部を３０゜以Ｆの先鋭角
に形成することにより、ゲート部におりる樹脂流動エリ
アはゲート部の開き角度を拡大することな（充分とるこ
とができて溶融樹脂の流動が円満に行われ低射出圧によ
る成形が可能となり、従来装置に比し種々の利点がある
。[Function] In hot runner injection molding equipment, by forming the tip of the torbead facing the gate of the torbead at an acute angle of 30°F or more, the resin flow area that goes down to the gate expands the opening angle of the gate. This system has various advantages over conventional equipment, as it is possible to obtain a sufficient amount of water (which allows the molten resin to flow smoothly, making it possible to perform molding with low injection pressure).
〔実施例」 以下、本発明の一実施例を図面を参照して説明する。〔Example" Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
し１において＋１１は固定側取付は板でこの下側にスペ
ーサーブロック（２）を介して受は板（３）が固定され
、この受は板（３）の下面にキャビティＣを形成する金
型（４）が取付けられている。In 1, +11 is a plate for fixed side mounting, and a plate (3) is fixed to the lower side of this via a spacer block (2), and this plate is a mold that forms a cavity C on the lower surface of the plate (3). (4) is installed.
この、取付けＪｉ＋１１と受は仮（３）との間にはマニ
ホールド（５）を配し、受は板（３）に対してセンター
ピン（６）により位置決めし、セットボルト（７）によ
り固着する。このマニホールド（５）に形成されるスプ
ル一部（流通路）（８）は取付は板（１）に設置された
ロケートリング（９）にスプルーブツシュ（１０）を介
して連通され、このスプル一部（８）のノズル（８ａ）
（１’ｌにはランナーブツシュ（１１）が嵌着されて
金型（４）のゲート部（１２）に連通されており、この
マニホールド（５）にはヒータ（１３）が装填されて常
時加熱されている。A manifold (5) is placed between the mounting Ji+11 and the temporary receiver (3), and the receiver is positioned with the center pin (6) against the plate (3) and fixed with the set bolt (7). . A part of the sprue (flow path) (8) formed in this manifold (5) is connected to a locate ring (9) installed on the plate (1) via a sprue bush (10). Part (8) of nozzles (8a)
(The runner bush (11) is fitted into 1'l and communicates with the gate part (12) of the mold (4), and this manifold (5) is loaded with a heater (13) and is always on. It's heated.
そして、マニホールド（５）にはスプル一部（８）のノ
ズル（８ａ）からランナーブツシュ（１１）に挿通され
、金型（４）のゲート部（１２）に達するトービード（
１４）が備えられており、このトービード（１４）は内
部にヒータ（１５）が内蔵され、ゲート部（１２）の漏
斗状に形成されるゲート（１２ａ）に臨むトービード先
端部、即ちゲートチップ部（１４ａ）は尖鋭状に形成し
てあり、本例においてはこのトービード（１４）の先端
ゲートチップ部（１４ａ）は先端角θ１は３０°以下で
逆円錐形に形成しである。また、金型（４）のゲート（
１２ａ）の開き角θ２は従来のものと同じで６０°〜１
２０°に形成されている。Then, in the manifold (5), there is a toe bead () that is inserted from the nozzle (8a) of the sprue part (8) to the runner bush (11) and reaches the gate part (12) of the mold (4).
14), this toe bead (14) has a built-in heater (15), and has a toe bead tip portion facing the funnel-shaped gate (12a) of the gate portion (12), that is, a gate tip portion. (14a) is formed into a sharp shape, and in this example, the tip gate tip portion (14a) of this toe bead (14) is formed into an inverted conical shape with a tip angle θ1 of 30° or less. Also, the gate of the mold (4) (
The opening angle θ2 of 12a) is the same as the conventional one, 60° to 1
It is formed at an angle of 20°.
従ってトービード（１４）のゲートチップ部（１４ａ
）の外周面とゲート部（１２）のゲート（１２ａ）の内
周面との間の樹脂流動を部は、θ２−０１即ちって広く
形成されることになる。即ち、トービード（１４）の先
端ゲートチップ部（１４ａ）を出来るだけ鋭角で小体積
にすることによってゲー）（１２ａ）との間の樹脂流動
エリアが充分とれることになる。Therefore, the gate chip part (14a) of the torbead (14)
) and the inner circumferential surface of the gate (12a) of the gate part (12) is formed to be θ2-01, that is, to be wide. That is, by making the end gate tip portion (14a) of the toe bead (14) at an angle as acute as possible and having a small volume, a sufficient resin flow area between the toe bead (14) and the gate tip portion (12a) can be secured.
また、このようにトービード（１４）の先端ゲートチッ
プ部（１４ａ）を鋭角に形成することはこのゲートチッ
プ部（１４ａ ）の元部径が細くなってトービード（１
４）に内蔵されるヒータ（１５）が先端側から離れるが
、ゲートチップ部（１４ａ）の先端側の体積は小さいの
で熱効率も良好となる。In addition, forming the distal end gate tip portion (14a) of the torpedo bead (14) at an acute angle in this way means that the base diameter of the gate tip portion (14a) becomes thinner and the toe bead (14) is formed at an acute angle.
Although the heater (15) built in 4) is separated from the tip side, the volume of the gate tip portion (14a) on the tip side is small, so thermal efficiency is also good.
なお、図中（１６）は受は板（３）及び金型（４）に穿
設された冷却水孔である。Note that the receiver (16) in the figure is a cooling water hole drilled in the plate (3) and the mold (4).
以上のように構成される射出成形装置は溶融樹脂が固定
側取付は板（１）に設置されたロケートリンク（９）か
らスブルーブッシェ（１０）を介してマニホールド（５
）のスプル一部（８）を流通してランナーブツシュ（１
１）から金型（４）のゲート部（１２）に達し、ゲー）
（１２ａ）から金型（４）のキャビティＣ内に射出圧入
され、所望の成形製品が得られる。In the injection molding apparatus configured as described above, the molten resin is attached to the fixed side from the locate link (9) installed on the plate (1) to the manifold (5) via the blue busher (10).
)'s sprue part (8) is distributed and the runner bush (1
1) to the gate part (12) of the mold (4).
(12a) is injected and press-fitted into the cavity C of the mold (4) to obtain a desired molded product.
この成形において熔融樹脂はマニホールド鳳５）のスプ
ル一部（８）からランナーブツシュ（１１）内をトービ
ード（１４）に沿って流通されるのでトービード（１４
）内のヒータ（１５）によってを効に加熱されると共に
ゲート部（１２）のゲート（１２ａ）内においても熱効
率の良好なゲートチップ部（１４ａ）によって加熱され
て熔融状態が維持され、また、トービード（１４）の先
端ゲートチップ部（１４ａ）とゲート（１２ａ）との間
の樹脂流動エリアはゲート径を大きくすることなく充分
とることが出来ることにより、溶融樹脂の流通性が改善
されて低い射出圧で流通させることが出来ると共にこの
流通性の改善により射出圧力の残圧が低減されてゲート
（１２ａ）内における圧力歪が少くなり、ゲート切れも
向上される。さらに、この樹脂流通性の改善により従来
の射出成形装置に比し低い射出圧力、射出時間の短縮を
図ることができて成形サイクルタイムの短縮も可能とな
る０例えば従来装置においては射出圧力１２６ ｋｇ
／ ｃｌＩ、射出時間２．１ ｓｅｃに対して本例装置
では射出圧力９８ｋｇ ／ ｃｄ、射出時間１．５ ｓ
ｅｃで成形されることになる。In this molding, the molten resin flows from the sprue part (8) of the manifold bolt 5) through the runner bushing (11) along the torbead (14).
) is effectively heated by the heater (15) in the gate part (12), and is also heated in the gate (12a) of the gate part (12) by the gate chip part (14a) with good thermal efficiency, so that the molten state is maintained; Since the resin flow area between the tip gate tip (14a) of the toe bead (14) and the gate (12a) can be sufficiently large without increasing the gate diameter, the flowability of the molten resin is improved and is low. The injection pressure can be used to flow the fluid, and the improved fluidity reduces the residual pressure of the injection pressure, reducing pressure distortion within the gate (12a) and improving gate breakage. Furthermore, due to this improved resin flowability, it is possible to achieve lower injection pressure and shorter injection time compared to conventional injection molding equipment, making it possible to shorten molding cycle time.For example, in conventional equipment, injection pressure is 126 kg.
/clI, injection time 2.1 sec, whereas in this example device, the injection pressure is 98 kg/cd, and the injection time is 1.5 s.
It will be molded using EC.
また、金型（４）のゲート（１２ａ）はそのゲート径を
大きく、即ちゲート開き角度を小さくする必要がないの
で金型（４）のゲート部周辺が肉薄となって強度が低下
してクラックが生じる等のおそれがなく長期の繰返し使
用に充′分耐える。In addition, since the gate (12a) of the mold (4) has a large gate diameter, that is, there is no need to make the gate opening angle small, the area around the gate of the mold (4) becomes thin, the strength decreases, and cracks occur. It can withstand repeated use over a long period of time without any risk of damage.
以上は本発明の一例であって本発明はこの実施例に限定
されているものではなく、本発明の要旨を逸脱しない範
囲で変更できるものである。The above is an example of the present invention, and the present invention is not limited to this embodiment, but may be modified without departing from the gist of the present invention.
以上のように本発明によれば熔融樹脂の流通路からゲー
ト部に連続して内部加熱形トービードを配し、ゲート部
に対応するトービード先端部を３０”以下の先鋭角度に
形成したことにより、ゲート部の樹脂流通エリアを充分
とることが出来て溶融樹脂の流通が日清に行われ、低射
出圧での成形が可能となって取数を増加でき、またゲー
ト切れが良好となり、成形品内の残留応力が小さくなっ
て成形金が減少されて良質の成形品が得られる。As described above, according to the present invention, an internally heated tortoise bead is disposed continuously from the molten resin flow path to the gate part, and the tip of the torbead corresponding to the gate part is formed at an acute angle of 30" or less. The resin distribution area at the gate part is sufficiently large, allowing the molten resin to flow through Nissin, making it possible to mold with low injection pressure, increasing the number of moldings, and improving gate cutting, which improves molded products. The residual stress inside the mold is reduced, the amount of molded metal is reduced, and a high-quality molded product can be obtained.
しかもトービード先端部は鋭角で元部も細く形成される
ことにより熱効率が良好でトービードの加熱、非加熱に
よるゲート部における樹脂の熔融、固化が確実に行われ
てゲート開閉性も良好となり、従って樹脂射出圧ゲート
切れ、ゲート開閉性の最適条件調Ｍ幅を広くとることが
できて所望の成形品が容易に得られるホットランナー式
射出成形装置を提供できる。Furthermore, the tip of the torbead is formed at an acute angle and the base part is also narrow, resulting in good thermal efficiency, and the resin at the gate part is reliably melted and solidified by heating or not heating the torbead, resulting in good gate opening/closing performance. It is possible to provide a hot runner type injection molding apparatus in which a desired molded product can be easily obtained by widening the optimal condition adjustment range for injection pressure gate cutting and gate opening/closing performance.
第１図は本発明によるホットランナー式射出成形装置の
一例の要部の拡大断面図、第２図は同、射出成形装置の
一例の一部截断正面図である。
図中（４）は金型、Ｃはキャビティ、（５）はマニホー
ルド、（８）はスプル一部、（１２）はゲート部、（１
２ａ）はゲート、（１４）はトービード、（１４ａ ）
はト一ビード先端部である。
同 松隈秀盛
４：合づに １４；トーヒーｐＣ゛キ
ダこ゛ティ １４α：先ガ鵬郁乏：ケ゛−
ト苔ｐ
木イ列琵１の４剖１ト拡、を断面図
第１図FIG. 1 is an enlarged sectional view of a main part of an example of a hot runner type injection molding apparatus according to the present invention, and FIG. 2 is a partially cutaway front view of an example of the same injection molding apparatus. In the figure, (4) is the mold, C is the cavity, (5) is the manifold, (8) is part of the sprue, (12) is the gate part, (1
2a) is the gate, (14) is the tobeed, (14a)
is the tip of the bead. Same Hidemori Matsukuma 4: Match 14; Touhy pC ゛Kidakity 14α: First Gaho Ikuho: K-
Fig. 1 is a cross-sectional view of the 4th section of the 1st tree and the 1st enlarging tree.
Claims (1)
ービードを配して成るホットランナー式射出成形装置に
おいて、 上記トービードの上記ゲート部に臨むトービード先端部
を３０°以下の先鋭角に形成して成り、上記ゲート部に
おける樹脂流動エリアを所要状態に設定できるようにし
たことを特徴とするホットランナー式射出成形装置。[Scope of Claims] A hot runner injection molding device comprising an internally heated torpedo disposed continuously from a molten resin flow path to a gate portion, wherein the tip of the torbead facing the gate portion is set at an angle of 30° or less. A hot runner type injection molding apparatus characterized in that the resin flow area in the gate part can be set to a desired state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62130928A JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62130928A JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63295225A true JPS63295225A (en) | 1988-12-01 |
| JP2638807B2 JP2638807B2 (en) | 1997-08-06 |
Family
ID=15045998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62130928A Expired - Fee Related JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2638807B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50129659U (en) * | 1974-04-10 | 1975-10-24 | ||
| JPS5260848A (en) * | 1975-11-14 | 1977-05-19 | Sumitomo Bakelite Co | Mold for hot runner molding |
| JPS5769184U (en) * | 1980-10-14 | 1982-04-26 | ||
| JPS6221514A (en) * | 1985-07-18 | 1987-01-29 | ベルナルト・シユタウバ− | Transfer nozzle in high-temperature path tool |
-
1987
- 1987-05-27 JP JP62130928A patent/JP2638807B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50129659U (en) * | 1974-04-10 | 1975-10-24 | ||
| JPS5260848A (en) * | 1975-11-14 | 1977-05-19 | Sumitomo Bakelite Co | Mold for hot runner molding |
| JPS5769184U (en) * | 1980-10-14 | 1982-04-26 | ||
| JPS6221514A (en) * | 1985-07-18 | 1987-01-29 | ベルナルト・シユタウバ− | Transfer nozzle in high-temperature path tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2638807B2 (en) | 1997-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |