JPH0767714B2 - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH0767714B2 JPH0767714B2 JP61198689A JP19868986A JPH0767714B2 JP H0767714 B2 JPH0767714 B2 JP H0767714B2 JP 61198689 A JP61198689 A JP 61198689A JP 19868986 A JP19868986 A JP 19868986A JP H0767714 B2 JPH0767714 B2 JP H0767714B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- cooling water
- molded product
- hole
- bush
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、射出成形用金型、特にコップ状の有底筒形射
出成形品を成形する、該成形品の底部にゲートを有する
金型に関するものである。Description: TECHNICAL FIELD The present invention relates to an injection molding die, and more particularly to a die for molding a cup-shaped bottomed cylindrical injection-molded article, which has a gate at the bottom thereof. It is about.
（従来の技術） コップ状の有底筒形射出成形品を成形するに当っては、
金型内に溶融樹脂を充填した後、この樹脂をできるだけ
短時間で固化させることが、成形サイクルを上げ生産性
を向上させる上から望ましい。このため、樹脂の固化を
促進するための手段として、冷却水による金型冷却が一
般に行われている。すなわち、コップ状の成形品にあっ
ては、該成形品の内面を形成するコアの内部に丸穴を掘
り、この穴の中に仕切板，パイプ（バヨネット），螺管
等を入れて冷却水孔を形成し、この冷却水孔に冷却水を
通水してコア内部を循環させることによりコアを冷却す
る構造が採用されている。特願昭60−202146号（特公平
６−18758号）は当出願人よりこのような技術の改良を
提案したものである。(Prior Art) In molding a cup-shaped bottomed cylindrical injection-molded product,
After the molten resin is filled in the mold, it is desirable to solidify the resin in the shortest possible time from the viewpoint of increasing the molding cycle and improving the productivity. Therefore, as a means for promoting the solidification of the resin, cooling of the mold with cooling water is generally performed. That is, in the case of a cup-shaped molded product, a circular hole is dug inside the core forming the inner surface of the molded product, and a partition plate, a pipe (bayonet), a screw pipe, etc. are put in this hole to cool water. A structure is adopted in which holes are formed and cooling water is passed through the cooling water holes to circulate inside the core to cool the core. Japanese Patent Application No. 60-202146 (Japanese Patent Publication No. 6-18758) proposes an improvement of such a technique by the present applicant.
（発明が解決しようとする問題点） このような冷却構造を備えた従来の射出成形用金型にあ
っては、コアの内部において成形品の底部内面に面する
コアの先端面の近傍に冷却水孔のチャンバが形成される
こととなるため、次のような問題が生ずる。すなわち、
成形品の外面を形成するキャビティプレートには、通常
該成形品の底部に面する位置にゲートが形成されている
ので、このゲートから樹脂が射出されるとコアの先端面
には射出圧力による大きな荷重が作用する。一方、コア
の先端部は上記チャンバの存在により周辺部以外は十分
な強度が得られない。したがって、コアの先端部は、周
辺固定あるいは周辺単純支持の円板が射出圧力等の荷重
を受けるとして強度計算を行う必要があるため、その肉
厚寸法は大きいものとなってしまう。しかしながら、コ
アの先端部が厚肉になると、冷却水とコアとの熱交換面
とコアの先端面との距離が大きくなるため、冷却水孔に
冷却水を循環させても、成形時ゲートから射出された溶
融樹脂により最も高温となるコアの先端面の温度低下が
十分になされず、このため金型内に充填された樹脂の固
化を短時間で行うことが困難となる。これに対して冷却
水の温度を下げたり流量を増やしたりする冷却効率向上
索を施しても、コアの先端面にまで所要の熱伝達を行わ
しめるにはなお不十分である。したがって、従来の金型
においては、成形サイクルを上げるために金型冷却時間
を短縮すると、成形品の底部の固化が十分になされない
うちに型開きが行われることになってしまうので、成形
品の底部のヒケやゲート糸ひきといった外観不良が発生
し成形品に品質低下を来たすこととなる。このため従
来、成形サイクルを一定以上には上げることができず、
これが生産性向上を阻害する大きな要因となっていた。(Problems to be Solved by the Invention) In a conventional injection molding die having such a cooling structure, cooling is performed in the vicinity of the tip end surface of the core facing the inner surface of the bottom of the molded product inside the core. Since the water hole chamber is formed, the following problems occur. That is,
Since the cavity plate forming the outer surface of the molded product is usually provided with a gate at a position facing the bottom of the molded product, when resin is injected from this gate, a large amount of injection pressure is applied to the front end surface of the core due to the injection pressure. Load acts. On the other hand, at the tip of the core, due to the presence of the chamber, sufficient strength cannot be obtained except for the peripheral portion. Therefore, since the strength of the tip portion of the core needs to be calculated on the assumption that the disk fixed to the periphery or simply supported on the periphery receives a load such as the injection pressure, the wall thickness becomes large. However, if the tip of the core becomes thicker, the distance between the heat exchange surface between the cooling water and the core and the tip end surface of the core will increase, so even if the cooling water is circulated through the cooling water hole, it will still be discharged from the gate during molding. The injected molten resin does not sufficiently reduce the temperature of the tip end surface of the core, which becomes the highest temperature, which makes it difficult to solidify the resin filled in the mold in a short time. On the other hand, even if a cooling efficiency improving rope is used to lower the temperature of the cooling water or increase the flow rate, it is still insufficient to carry out the required heat transfer to the tip surface of the core. Therefore, in the conventional mold, if the mold cooling time is shortened in order to increase the molding cycle, the mold will be opened before the bottom of the molded product is solidified sufficiently. A defective appearance such as a sink mark at the bottom of the product or a pulling of the gate thread occurs, which causes deterioration in quality of the molded product. Therefore, conventionally, the molding cycle could not be raised above a certain level,
This has been a major factor that hinders productivity improvement.
本発明は、このような事情に鑑みなされたものであっ
て、成形品に品質低下を来たすことなく成形サイクルを
上げることができ、かつ、これを十分な金型強度を確保
した上で実現することのできる射出成形用金型を提供し
ようとするものである。The present invention has been made in view of such circumstances, and can be realized while increasing the molding cycle without deteriorating the quality of the molded product and ensuring sufficient mold strength. The present invention is intended to provide a mold for injection molding which can be used.
（問題点を解決するための手段） 本発明による射出成形用金型は、コア内部の構造に工夫
を施すことにより、成形時最も高温となるコア先端面の
急速冷却を可能ならしめ、上記問題点の解決を図るよう
にしたものである。すなわち、有底筒形射出成形品の外
面を形成する、該成形品の底部外面に面する位置にゲー
トが形成されたキャビティプレートと、該成形品の内面
を形成するコアとを備えた射出成形用金型において、前
記コアの内部に、該コアの前記成形品の底部内面に面す
る先端面近傍にまで延びる水孔を穿け、この水孔内に仕
切板を立設して、前記先端面近傍の該仕切板端部におい
て冷却水が折り返して循環する冷却水孔を形成し、該冷
却水孔に臨む前記コアの前記先端面近傍の内面に、冷却
水の流れ方向と略平行に前記冷却水孔に張り出す少なく
とも１つのリブを設けたことを特徴とするものである。(Means for Solving Problems) In the injection molding die according to the present invention, by devising the internal structure of the core, rapid cooling of the core tip surface, which becomes the highest temperature at the time of molding, can be achieved. This is to solve the problem. That is, an injection molding including a cavity plate that forms an outer surface of a bottomed cylindrical injection-molded product, in which a gate is formed at a position facing a bottom outer surface of the molded product, and a core that forms an inner surface of the molded product. In the mold for use in the core, a water hole is formed inside the core, the water hole extending to the vicinity of the tip end surface facing the inner surface of the bottom of the molded product of the core, and a partition plate is erected in the water hole. A cooling water hole is formed at the end of the partition plate near which the cooling water folds back and circulates, and the cooling water is formed on the inner surface of the core near the tip end surface facing the cooling water substantially parallel to the flow direction of the cooling water. It is characterized in that at least one rib overhanging the water hole is provided.
上記「リブ」は、その断面形状あるいは員数等特に限定
されるものではなく、要するに冷却水孔内に冷却水の流
れ方向と略平行に張り出すものであればよい。The above-mentioned “rib” is not particularly limited in terms of its cross-sectional shape, number of members, etc., and in short, it may be one that overhangs in the cooling water hole substantially parallel to the flow direction of the cooling water.
（作用） 上記構成に示すように、冷却水孔に臨むコアの先端面近
傍の内面にはリブが冷却水孔に張り出して設けられてい
るので、冷却水孔内を循環する冷却水とコアとの熱交換
面積を大きくとることが可能となり、このためコアの先
端部を急速に冷却せしめることが可能となる。そして、
上記リブは冷却水の流れ方向と略平行に設けられている
ので、冷却水の溜り（デッドスペース）が生ずることが
なく境膜伝熱係数の低下を防ぐことができ、コアと冷却
水との熱交換を効率よく行うことができる。(Operation) As shown in the above configuration, since the ribs are provided on the inner surface near the tip end surface of the core facing the cooling water hole so as to project to the cooling water hole, the cooling water and the core circulating in the cooling water hole It is possible to increase the heat exchange area of the core, which makes it possible to rapidly cool the tip of the core. And
Since the ribs are provided substantially parallel to the flow direction of the cooling water, pools of the cooling water (dead spaces) do not occur and the film heat transfer coefficient can be prevented from lowering. Heat exchange can be performed efficiently.
また、上記リブが設けられることにより、コアの先端部
の強度が増大するので、冷却水孔形成用の水孔をコアの
先端面により近い位置まで延びるように形成することが
可能となり、これによりコアの先端面への熱伝達が十分
になされ、射出成形後の成形品をより一層急速に冷却さ
せることが可能となる。一方、上記リブの存在により、
コアの先端面が射出圧力により大きな荷重を受けても破
断しない十分な強度をコアの先端部に持たせることが可
能となる。Further, since the strength of the tip portion of the core is increased by providing the rib, it becomes possible to form the water hole for forming the cooling water hole so as to extend to a position closer to the tip surface of the core. Heat is sufficiently transferred to the tip surface of the core, and the molded product after injection molding can be cooled more rapidly. On the other hand, due to the presence of the ribs,
It is possible to give the tip portion of the core a sufficient strength so that the tip surface of the core does not break even if a large load is applied by the injection pressure.
（発明の効果） したがって、本発明によれば、射出成形品に底引けやゲ
ート糸ひきといった外観不良による品質低下を来たすこ
となく、成形サイクルを上げることができ、かつ、これ
を十分な金型強度を確保した上で実現することができ
る。(Effects of the Invention) Therefore, according to the present invention, it is possible to increase the molding cycle without causing deterioration in quality due to defective appearance such as bottoming and gate stringing in the injection molded product, and to improve the molding cycle with a sufficient mold. It can be realized after securing the strength.
（実 施 例） 以下添付図面を参照して本発明の一実施例について詳述
する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.
第１図は、本実施例による射出成形用金型を型締めした
状態で示す側断面図である。FIG. 1 is a side sectional view showing a state where the injection molding die according to the present embodiment is clamped.
この射出成形用金型は、固定型であるキャビティプレー
ト1aと、可動型であるコア1bとを図中のPL（パ−ティン
グライン）にて型合わせするようにされてなるものであ
って、これら両型によりコップ状の有底筒形射出成形品
２のキャビティ３が構成されるようになっている。キャ
ビティプレート1aは、成形品２の底部外面形状を形成す
るゲートブッシュ４と、成形品２の筒部外周面形状を形
成するキャビティブッシュ５とが固着されてなり、ゲー
トブッシュ４にはキャビティ３内に溶融樹脂を充填する
ための、成形品２の底部外面に面する位置に形成された
ゲート６およびホットランナ７が設けられ、キャビティ
ブッシュ５にはキャビティ３の筒部を囲繞する環状の冷
却水孔８が形成されている。一方、コア1bは、成形品２
の底部内面および筒部内周面形状を形成するコアブッシ
ュ９と、成形品２の開口端面形状を形成する環状のスト
リッパブッシュ10とが嵌合されてなり、ストリッパブッ
シュ10は、成形品２の成形完了後キャビティプレート1a
とコア1bとの型開きがなされた後に、コアブッシュ９に
対して上方に相対移動し、成形品２の離型を行うように
なっている。This injection molding die is configured such that the cavity plate 1a that is a fixed die and the core 1b that is a movable die are matched by a PL (parting line) in the figure, The cavities 3 of the cup-shaped bottomed cylindrical injection-molded product 2 are constituted by these molds. The cavity plate 1a is formed by fixing a gate bush 4 forming the outer surface shape of the bottom of the molded product 2 and a cavity bush 5 forming the outer peripheral surface shape of the cylindrical portion of the molded product 2 in the cavity 3 inside the cavity 3. A gate 6 and a hot runner 7 formed at a position facing the outer surface of the bottom of the molded product 2 are provided for filling the molten resin into the cavity 2. The cavity bush 5 has an annular cooling water surrounding the cylindrical portion of the cavity 3. The hole 8 is formed. On the other hand, the core 1b is a molded product 2
The core bush 9 forming the inner surface of the bottom portion and the inner peripheral surface of the cylindrical portion is fitted with the annular stripper bush 10 forming the shape of the open end surface of the molded product 2. The stripper bush 10 forms the molded product 2 by molding. After completion Cavity plate 1a
After the mold is opened between the core 1b and the core 1b, the core 2 is moved relatively upward with respect to the core bush 9 to release the molded product 2.
コアブッシュ９の内部には、円筒形の穴11が形成されて
いて、その先端は成形品２の底部内面に面するコアブッ
シュ９の先端面近傍にまで延びている。この円筒形の穴
11には、上端部分を除きこの穴11を左右に２分する仕切
板（セパレータ）12が設けられ、これによりコアブッシ
ュ９の内部に冷却水を循環させるための冷却水孔13を形
成している。すなわち、コアブッシュ９に固定して設け
られた可動側取付板14には、冷却水の給排を行うための
供給孔15および排出孔16が、コアブッシュ９の穴11の下
端部の左右に延長して形成された１対の連絡孔17a,17b
を介してそれぞれ冷却水孔13に連通して形成されてい
て、供給孔15から連絡孔17aを経て冷却水孔13に流れ込
んだ冷却水は仕切板12に沿って冷却水孔13内を上昇し、
仕切板12の上方を迂回して再び仕切板12に沿って冷却水
孔13内を下降し、連絡孔17bを経て可動側取付板14の排
孔16へ流れ出るようになっている。可動側取付板14の上
端部の、供給孔15と連絡孔17aとの連結部分および排出
孔16と連絡孔17bとの連結部分にはそれぞれＯリング18
が設けられていて、これにより冷却水が漏れるのを防止
するようになっている。A cylindrical hole 11 is formed inside the core bush 9, and its tip extends to the vicinity of the tip surface of the core bush 9 which faces the inner surface of the bottom of the molded product 2. This cylindrical hole
11 is provided with a partition plate (separator) 12 that divides the hole 11 into left and right parts except for the upper end portion, and thereby a cooling water hole 13 for circulating cooling water is formed inside the core bush 9. There is. That is, in the movable side mounting plate 14 fixedly provided to the core bush 9, the supply hole 15 and the discharge hole 16 for supplying and discharging the cooling water are provided on the left and right of the lower end of the hole 11 of the core bush 9. A pair of extended communication holes 17a, 17b
The cooling water, which is formed to communicate with the cooling water holes 13 via the respective holes, flows into the cooling water holes 13 from the supply holes 15 through the communication holes 17a and rises in the cooling water holes 13 along the partition plate 12. ,
It bypasses the upper part of the partition plate 12, descends again inside the cooling water hole 13 along the partition plate 12, and flows out to the discharge hole 16 of the movable side mounting plate 14 via the communication hole 17b. An O-ring 18 is provided at the upper end of the movable side mounting plate 14 at the connecting portion between the supply hole 15 and the communication hole 17a and at the connecting portion between the discharge hole 16 and the communication hole 17b.
Is provided to prevent cooling water from leaking.
コアブッシュ９の先端面近傍の内面19、すなわち円周形
の穴11の上端部の冷却水孔13の折返し部分の天井面に
は、冷却水孔13内を流れる冷却水の流れ方向と略平行に
該冷却水孔13に張り出すリブ20が設けられている。The inner surface 19 of the core bush 9 near the tip surface, that is, the ceiling surface of the folded portion of the cooling water hole 13 at the upper end of the circumferential hole 11 is substantially parallel to the flow direction of the cooling water flowing in the cooling water hole 13. A rib 20 that overhangs the cooling water hole 13 is provided.
第２図は、第１図におけるII−II線で示すコアブッシュ
９の断面図である。図から明らかなように、リブ20は、
円筒形の穴11の軸線を通り仕切板12（第１図参照）と直
交する方向に延びて設けられている。リブ20は図示のよ
うに単一のものとして構成してもよいが、射出圧力の高
低等に応じて第３図に示すように互いに平行な複数のリ
ブ20′から構成するようにしてもよい。いずれの場合に
おいてもリブ20（あるいは20′）は、冷却水孔13（第１
図参照）を流れる冷却水の流れ方向と略平行となるよう
に設けられる。FIG. 2 is a sectional view of the core bush 9 taken along the line II-II in FIG. As is clear from the figure, the rib 20
It is provided so as to extend through the axis of the cylindrical hole 11 in a direction orthogonal to the partition plate 12 (see FIG. 1). The rib 20 may be formed as a single piece as shown in the drawing, or may be formed by a plurality of ribs 20 'which are parallel to each other as shown in FIG. 3 depending on the level of injection pressure. . In any case, the ribs 20 (or 20 ') have the cooling water holes 13 (first
It is provided so as to be substantially parallel to the flow direction of the cooling water flowing through (see the drawing).
上記リブ20（あるいは20′）の存在によりコアブッシュ
９の先端部の補強が図られるため、第１図に示すよう
に、コアブッシュ９の先端面近傍の内面19はコアブッシ
ュ９の先端面に近接して位置しており、これによりコア
ブッシュ９の先端部21の薄肉化が図られている。The presence of the ribs 20 (or 20 ') reinforces the tip end portion of the core bush 9, so that the inner surface 19 near the tip end surface of the core bush 9 becomes the tip end surface of the core bush 9 as shown in FIG. Since the core bushes 9 are located close to each other, the front end portion 21 of the core bush 9 is thinned.
なお、リブ20（あるいは20′）の断面形状については、
矩形断面、元太先細の台形断面、あるいは三角断面、半
円断面等、冷却水の流れに溜りが生じない形状であれば
任意の断面形状を採用することが可能である。Regarding the cross-sectional shape of the rib 20 (or 20 '),
Any cross-sectional shape can be adopted, such as a rectangular cross section, a trapezoidal cross section having a tapered shape, a triangular cross section, or a semicircular cross section, as long as the flow of cooling water does not accumulate.
次に本実施例の作用について説明する。Next, the operation of this embodiment will be described.
第１図に示すように、キャビティプレート1aとコア1bと
の型締めがなされるとホットランナ７からゲート６を介
して溶融樹脂が射出されキャビティ３内に充填される。
このときコアブッシュ９の先端面には射出圧力による大
きな荷重が作用するが、コアブッシュ９の先端部21は先
端面近傍の内面19に設けられたリブ20による補強が図ら
れているため、コアブッシュ９の先端部21が破断すると
いった危険性を回避することができる。As shown in FIG. 1, when the cavity plate 1a and the core 1b are clamped, a molten resin is injected from the hot runner 7 through the gate 6 to fill the cavity 3.
At this time, a large load due to the injection pressure acts on the tip surface of the core bush 9, but the tip portion 21 of the core bush 9 is reinforced by the ribs 20 provided on the inner surface 19 near the tip surface, so that the core It is possible to avoid the risk that the tip portion 21 of the bush 9 is broken.
キャビティ３内に射出された溶融樹脂は、ゲート６周
辺、すなわち成形品２の底部を構成する部分において最
も高温の状態にある。しかしながら、冷却水孔13を循環
する冷却水が仕切板12上方を迂回する際、この冷却水と
コアブッシュ９の先端面近傍の内面19およびリブ20の表
面との接触により大きな表面積範囲にわたって熱交換が
行われ、コアブッシュ９の先端部の冷却がなされる。そ
して、このコアブッシュ９の先端部21はリブ20の存在に
より薄肉に形成されているので、コアブッシュ９の先端
部21における内面19から先端面への熱伝達は容易に行わ
れ、これにより成形品２の底部に位置するキャビティ３
内の溶融樹脂を効率よく冷却することができ、溶融樹脂
の固化に要する時間の短縮を図ることができる。したが
って、成形完了後短時間のうちに型開きを行っても、成
形品２の底部に位置するキャビティ３内の溶融樹脂が固
化しきれず成形品２の底引けやゲート糸ひきといった外
観不良が発生するおそれがない。このため、一定の品質
を維持したまま、成形サイクルを上げることが可能とな
る。The molten resin injected into the cavity 3 is at the highest temperature in the vicinity of the gate 6, that is, the portion forming the bottom of the molded product 2. However, when the cooling water circulating in the cooling water holes 13 bypasses the upper part of the partition plate 12, the cooling water and the inner surface 19 near the tip surface of the core bush 9 and the surfaces of the ribs 20 come into contact with each other to exchange heat over a large surface area range. Then, the tip of the core bush 9 is cooled. Since the tip portion 21 of the core bush 9 is formed thin due to the presence of the ribs 20, heat transfer from the inner surface 19 to the tip surface of the tip portion 21 of the core bush 9 is easily performed, thereby forming Cavity 3 located at the bottom of item 2
The molten resin inside can be cooled efficiently, and the time required for solidification of the molten resin can be shortened. Therefore, even if the mold is opened within a short time after the completion of molding, the molten resin in the cavity 3 located at the bottom of the molded product 2 cannot be completely solidified, and a defective appearance such as a bottom shrinkage of the molded product 2 and a pulling of a gate thread occurs. There is no danger of Therefore, it is possible to increase the molding cycle while maintaining a constant quality.
またリブ20は、円筒形の穴11の上端部の冷却水孔13の折
返し部分における冷却水の流れ方向に略平行に設けられ
ているので、冷却水の溜り（デッドスペース）を生ずる
ことがなく、境膜伝熱係数の低下を防止することがで
き、コアブッシュ９の先端部21の冷却効率をさらに向上
させることが可能となる。Further, since the rib 20 is provided substantially parallel to the flow direction of the cooling water at the folded portion of the cooling water hole 13 at the upper end of the cylindrical hole 11, the cooling water pool (dead space) does not occur. It is possible to prevent a decrease in the film heat transfer coefficient, and it is possible to further improve the cooling efficiency of the tip end portion 21 of the core bush 9.
なお、成形品２の筒部に位置するキャビティ３内の溶融
樹脂の固化は、コアブッシュ９の冷却水孔13を循環する
冷却水、およびキャビティブッシュ５の冷却水孔８を循
環する冷却水の双方による冷却作用で短時間のうちに行
われる。The solidification of the molten resin in the cavity 3 located in the cylindrical portion of the molded product 2 is performed by cooling water circulating in the cooling water hole 13 of the core bush 9 and cooling water circulating in the cooling water hole 8 of the cavity bush 5. It is performed in a short time by the cooling action of both.
第１図は本発明による射出成形用金型の一例を示す側断
面図、 第２図は第１図のII−II線断面図、 第３図は第２図と同様の図である。 1a……キャビティプレート、1b……コア ２……有底筒形射出成形品、６……ゲート 13……冷却水孔、20……リブFIG. 1 is a side sectional view showing an example of an injection molding die according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a view similar to FIG. 1a ... cavity plate, 1b ... core 2 ... bottomed cylindrical injection molded product, 6 ... gate 13 ... cooling water hole, 20 ... rib
Claims (1)
成形品の底部外面に面する位置にゲートが形成されたキ
ャビティプレートと、該成形品の内面を形成するコアと
を備えた射出成形用金型において、 前記コアの内部に、該コアの前記成形品の底部内面に面
する先端面近傍にまで延びる水孔を穿け、この水孔内に
仕切板を立設して、前記先端面近傍の該仕切板端部にお
いて冷却水が折り返して循環する冷却水孔を形成し、該
冷却水孔に臨む前記コアの前記先端面近傍の内面に、冷
却水の流れ方向と略平行に前記冷却水孔に張り出す少な
くとも１つのリブを設けたことを特徴とする射出成形用
金型。1. A cavity plate, which forms an outer surface of a bottomed cylindrical injection-molded product, having a gate formed at a position facing the outer surface of the bottom of the molded product, and a core forming an inner surface of the molded product. In the injection molding die, a water hole extending to the vicinity of the tip end surface facing the bottom inner surface of the molded product of the core is bored inside the core, and a partition plate is erected in the water hole. A cooling water hole that circulates and circulates the cooling water is formed at the end of the partition plate near the front end surface, and the inner surface of the core near the front end surface facing the cooling water hole is substantially parallel to the flow direction of the cooling water. An injection-molding die, characterized in that at least one rib is provided on the cooling water hole.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198689A JPH0767714B2 (en) | 1986-08-25 | 1986-08-25 | Injection mold |
| DE19873728325 DE3728325C2 (en) | 1986-08-25 | 1987-08-25 | Cooled core for an injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198689A JPH0767714B2 (en) | 1986-08-25 | 1986-08-25 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6354227A JPS6354227A (en) | 1988-03-08 |
| JPH0767714B2 true JPH0767714B2 (en) | 1995-07-26 |
Family
ID=16395403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61198689A Expired - Fee Related JPH0767714B2 (en) | 1986-08-25 | 1986-08-25 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0767714B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100867189B1 (en) * | 2007-03-05 | 2008-11-06 | 창성정밀(주) | Cooling partition injection molding mould |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0622838B2 (en) * | 1987-07-22 | 1994-03-30 | 富士写真フイルム株式会社 | Injection mold |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5112869A (en) * | 1974-07-24 | 1976-01-31 | Yoshiharu Nagai | Purasuchitsukuno netsureiseikeiyokanagata |
-
1986
- 1986-08-25 JP JP61198689A patent/JPH0767714B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100867189B1 (en) * | 2007-03-05 | 2008-11-06 | 창성정밀(주) | Cooling partition injection molding mould |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6354227A (en) | 1988-03-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |