JPH0525862Y2 - - Google Patents
Info
- Publication number
- JPH0525862Y2 JPH0525862Y2 JP1987099937U JP9993787U JPH0525862Y2 JP H0525862 Y2 JPH0525862 Y2 JP H0525862Y2 JP 1987099937 U JP1987099937 U JP 1987099937U JP 9993787 U JP9993787 U JP 9993787U JP H0525862 Y2 JPH0525862 Y2 JP H0525862Y2
- Authority
- JP
- Japan
- Prior art keywords
- runner
- cavity
- annular
- film gate
- sprue
- 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
- 239000012778 molding material Substances 0.000 claims description 19
- 238000001746 injection moulding Methods 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 13
- 208000015943 Coeliac disease Diseases 0.000 description 18
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は射出成形装置に関し、特に、溶融状態
にある成形材料を受けてシールリング等の円環状
の成形品を高品質で成形することのできる射出成
形装置に関するものである。[Detailed description of the invention] [Industrial field of application] The present invention relates to an injection molding device, and in particular, to molding an annular molded product such as a seal ring with high quality by receiving a molding material in a molten state. This relates to injection molding equipment that can be used.
従来、Ｏリングやリツプシール等の円環状のシ
ールリングの成形法としては、第５図に示すイン
ジエクシヨン・ランナゲート法が知られている。
Conventionally, as a method for forming annular seal rings such as O-rings and lip seals, the injection runner gate method shown in FIG. 5 has been known.
すなわち、当接離間する金型１，２の分割面
に、複数の円環状のキヤビテイ溝３を配設すると
ともに、キヤビテイ溝３を棒状ランナー４と、そ
の先端のゲート５で連結して１個のキヤビテイ溝
３へ１点のゲート５から成形材料を射出流入さ
せ、成形加工していた。ここで６はノズル間挿
穴、７はスプルーである。 That is, a plurality of annular cavity grooves 3 are provided on the dividing surfaces of the molds 1 and 2 that are brought into contact with each other and separated, and the cavity grooves 3 are connected to a rod-shaped runner 4 by a gate 5 at its tip to form one piece. The molding material was injected and flowed into the cavity groove 3 from one gate 5 for molding. Here, 6 is a nozzle insertion hole, and 7 is a sprue.
しかし、この方法には、第６図に示すように１
点のゲート５から流入した成形材料の流れは矢印
Ａ，Ｂのように分流し、約180度反対の位置で矢
印A′，B′のように合流するが、この合流部位に
ウエルド８が発生し易く、成形品として不良品が
できやすい大きな欠点を有していた。 However, this method requires 1
The flow of molding material flowing in from the gate 5 at the point is divided as shown by arrows A and B, and merges at approximately 180 degrees opposite positions as shown by arrows A' and B', but a weld 8 occurs at this joining part. This had the major disadvantage of being easy to mold and producing defective molded products.
上記の欠点を改良するものとして、特開昭61−
185426号にゲート５をキヤビテイ溝３の周囲に配
設したものが示されている。 To improve the above-mentioned drawbacks, JP-A-61-
No. 185426 shows a structure in which a gate 5 is arranged around a cavity groove 3.
すなわち、第７図は上記欠点が改良された射出
成形装置の断面図、第８図は第７図の−線矢
視断面図、第９図は第７図の要部拡大断面図であ
り、同図において、上金型１０と下金型１１の分
割面に形成される円環状のキヤビテイ溝１２の内
周側に近接してリング状ランナー１３が形成され
ている。 That is, FIG. 7 is a cross-sectional view of an injection molding apparatus in which the above-mentioned drawbacks have been improved, FIG. 8 is a cross-sectional view taken along the line - - in FIG. 7, and FIG. 9 is an enlarged cross-sectional view of the main part of FIG. 7. In the figure, a ring-shaped runner 13 is formed adjacent to the inner circumferential side of an annular cavity groove 12 formed on the dividing surface of the upper mold 10 and the lower mold 11.
そして、前記キヤビテイ溝１２とリング状ラン
ナー１３とは全周にわたつて微小間隙かつ微小幅
のフイルムゲート１４にて連通連結されている。
また、前記上金型１０のリング状ランナー１３の
直上の一箇所には射出ノズル１５が設けられ、そ
れに続いてスプルー１６が、前記リング状ランナ
ー１３に連通連結される。 The cavity groove 12 and the ring-shaped runner 13 are connected to each other by a film gate 14 having a minute gap and a minute width over the entire circumference.
Further, an injection nozzle 15 is provided at one location directly above the ring-shaped runner 13 of the upper mold 10, and a sprue 16 is subsequently connected to the ring-shaped runner 13 in communication.
さらに、前記リング状ランナー１３に成形材料
を供給するスプルー１６が連設された位置から遠
ざかる程、前記フイルムゲート１４を介して外径
方向にフイルム状としてキヤビテイ溝１２に流入
する成形材料の流入抵抗を減少させるように、フ
イルムゲート１４の微小幅Ｗを周方向位置に応じ
て変化させている。 Furthermore, the further away from the position where the sprue 16 for supplying the molding material to the ring-shaped runner 13 is connected, the more the resistance to the inflow of the molding material flowing into the cavity groove 12 in the outer diameter direction in the form of a film through the film gate 14 increases. The minute width W of the film gate 14 is changed according to the circumferential position so as to reduce the width W of the film gate 14.
すなわち、前記スプルー１６の近傍におけるフ
イルムゲート１４の微小幅Wsを最大とし、他方
180度反対側の微小幅Wlを最小として、両者の間
において、この微小幅Ｗを連続的に変化させてい
る。 That is, the minute width Ws of the film gate 14 in the vicinity of the sprue 16 is made the maximum, and the other
The minute width Wl on the 180 degrees opposite side is set as the minimum, and this minute width W is continuously changed between the two.
この結果、平面視円形の前記キヤビテイ溝１２
の中心点と、平面視円形の前記リング状ランナー
１３の中心点とは、偏心量εだけ偏心させて配置
されている。 As a result, the cavity groove 12 is circular in plan view.
The center point of the ring-shaped runner 13, which is circular in plan view, is eccentrically arranged by an eccentric amount ε.
また、他の態様として、フイルムゲート１４の
微小幅Ｗを一定として微小間隔Ｔを変化させて行
うことも示されている。 Furthermore, as another aspect, it is also shown that the process is carried out by keeping the minute width W of the film gate 14 constant and changing the minute interval T.
しかしながら、ウエルド８の発生が防止された
第７図〜第９図に示した従来技術においては、キ
ヤビテイ溝１２に連通連結するフイルムゲート１
４の微小間隙もしくは微小幅を変化させるため、
成形材料流入部のフイルム状バリが一様でなく、
バリを引きちぎつた後の再加工を必要とする他、
加工跡が一様でないため商品価値が低下する等の
問題点を有していた。 However, in the prior art shown in FIGS. 7 to 9 in which the generation of the weld 8 is prevented, the film gate 1 connected to the cavity groove 12 is
In order to change the minute gap or minute width of 4,
The film-like burrs at the molding material inlet are not uniform.
In addition to requiring reprocessing after tearing off the burr,
There were problems such as a decrease in product value because the processing marks were not uniform.
本考案は前記のような従来技術のもつ問題点を
解決したものであつて、ウエルドの発生が防止さ
れるとともに、バリの引きちぎりが容易で、バリ
を引きちぎつた後の切離し跡が一様で商品価値が
低下することがない成形品が得られる射出成形装
置を提供することを目的としている。 The present invention solves the above-mentioned problems of the conventional technology, and it prevents the occurrence of welds, makes it easy to tear off the burr, and leaves uniform marks after tearing off the burr. The purpose of the present invention is to provide an injection molding device that can produce molded products without deterioration in commercial value.
上記の問題点を解決するために本考案は、一対
の型の分割間面に環状の成形用キヤビテイを有
し、前記キヤビテイの周面に環状の第２のランナ
ーを有すると共に、前記第２のランナーには成形
材料を注入するスプルーを備え、前記キヤビテイ
と前記第２のランナーとの間に環状の前記キヤビ
テイより小形の第１のランナーを有すると共に前
記第１のランナーと前記第２のランナーとの間に
前記スプルーから遠ざかるほど前記第２のランナ
ーからの成形材料の流入抵抗が小さくなる幅また
は間隙に形成された第２のフイルムゲートを有
し、且つ前記第１のランナーと前記キヤビテイと
の間にほぼ同一間隔の第１のフイルムゲートを有
する手段を採用したものである。
In order to solve the above-mentioned problems, the present invention has an annular molding cavity on the dividing surface of a pair of molds, a second annular runner on the circumferential surface of the cavity, and a second annular runner on the circumferential surface of the cavity. The runner is provided with a sprue for injecting the molding material, and has an annular first runner smaller than the cavity between the cavity and the second runner, and the first runner and the second runner between the first runner and the cavity; This method employs a method having first film gates spaced approximately at the same distance therebetween.
本考案は上記の手段を採用したことにより、ス
プルーから注入された成形材料は、第２のランナ
ーから第２のフイルムゲートを介して第１のラン
ナー内に流れ込んで第１のランナー内を充満し、
第１のフイルムゲートを介してキヤビテイ内に流
れ込んでキヤビテイ内を充満することになる。
By adopting the above-mentioned means, the present invention allows the molding material injected from the sprue to flow from the second runner into the first runner through the second film gate and fill the first runner. ,
It flows into the cavity through the first film gate and fills the cavity.
以下、図面に示す本考案の実施例について説明
する。
Embodiments of the present invention shown in the drawings will be described below.
第１図は本考案の射出成形装置の一実施例の平
面説明図、第２図は第１図Ａ−Ａ線矢視断面説明
図である。 FIG. 1 is an explanatory plan view of one embodiment of the injection molding apparatus of the present invention, and FIG. 2 is an explanatory cross-sectional view taken along the line A--A in FIG.
すなわち、この射出成形装置は、可動側取付け
板２１と、この可動側取付け板２１に相対して離
隔する固定側取付け板２２と、前記可動側取付け
板２１と固定側取付け板２２との間にあり、可動
側取付け板２１に一体に取り付けられた第１の型
である可動側型板２３と、固定側取付け板２２に
一体に取り付けられた第２の型である固定側型板
２４とからなり、前記可動取付け板２１には図示
しない駆動装置が設けられるとともに、前記固定
側取付け板２２との間にはダイバー２５が設けら
れている。 That is, this injection molding apparatus has a movable side mounting plate 21, a fixed side mounting plate 22 that is spaced apart from the movable side mounting plate 21, and a space between the movable side mounting plate 21 and the fixed side mounting plate 22. There is a movable side template 23 which is a first mold integrally attached to the movable side mounting plate 21, and a fixed side template 24 which is a second mold integrally attached to the fixed side mounting plate 22. The movable mounting plate 21 is provided with a drive device (not shown), and a diver 25 is provided between the movable mounting plate 21 and the fixed mounting plate 22.
前記固定側取付け板２２には図示しないゴム等
の成形材料を射出する射出装置のノズルが挿入さ
れるノズル間挿穴２６が穿設されている。 The fixed side mounting plate 22 is provided with a nozzle insertion hole 26 into which a nozzle of an injection device (not shown) for injecting a molding material such as rubber is inserted.
前記可動側型板２３と固定側型板２４とは、前
記可動側取付け板２１に設けられた駆動装置によ
り当接離間し、当接時に両型板２３，２４で円環
状のキヤビテイ溝２７を形成するとともに、この
キヤビテイ溝２７の内周に沿つて第１の円環状ラ
ンナー２８と、この第１の円環状ランナー２８の
内周に沿つて第２の円環状ランナー２９が形成さ
れ、前記キヤビテイ溝２７と第１の円環状ランナ
ー２８との間は、全周にわたつて微小間隙かつ微
小幅の第１のフイルムゲート３０にて連通連結さ
れ、前記第１の円環状ランナー２８と第２の円環
状ランナー２９との間は全周にわたつて、前記第
１のフイルムゲート３０以上の大きさの間隙かつ
幅の第２のフイルムゲート３１にて連通連結され
ている。 The movable side mold plate 23 and the fixed side mold plate 24 are brought into contact and separated by a drive device provided on the movable side mounting plate 21, and when they abut, both mold plates 23 and 24 form an annular cavity groove 27. At the same time, a first annular runner 28 is formed along the inner periphery of the cavity groove 27, and a second annular runner 29 is formed along the inner periphery of the first annular runner 28. The groove 27 and the first annular runner 28 are connected to each other by a first film gate 30 having a minute gap and a minute width over the entire circumference. The annular runner 29 is connected to the second film gate 31 over the entire circumference by a second film gate 31 having a gap and width larger than the first film gate 30 .
また、前記第２の円環状ランナー２９には、前
記ノズル間挿穴２６に連設されたスプルー３２が
配設され、第２の円環状ランナー２９のスプルー
３２が配設された位置から遠ざかるほど、該ラン
ナー２９から、前記第２のフイルムゲート３１を
介して前記第１の円環状ランナー２８に流入する
成形材料の流入抵抗を減少させるように、前記第
２のフイルムゲート３１の幅が小さくされてい
る。 Further, the second annular runner 29 is provided with a sprue 32 that is continuous with the nozzle insertion hole 26, and the further away from the position where the sprue 32 of the second annular runner 29 is provided, the more , the width of the second film gate 31 is made small so as to reduce the inflow resistance of the molding material flowing from the runner 29 into the first annular runner 28 via the second film gate 31. ing.
すなわち、スプルー３２が設けられた位置の第
２のフイルムゲート３１の幅Wl1を最大にして、
その180度反対の位置の第２のフイルムゲート３
１の幅Wl2を最小にして、その間を連続的に変化
させている。 That is, the width Wl 1 of the second film gate 31 at the position where the sprue 32 is provided is maximized,
2nd film gate 3 at 180 degrees opposite position
The width Wl 2 of 1 is set to the minimum, and the width is changed continuously between the two.
従つて、前記キヤビテイ溝２７と第１の円環状
ランナー２８は同心円であるが、前記第２の円環
状ランナー２９はεだけスプルー３２から遠ざか
る方向に偏心している。 Therefore, the cavity groove 27 and the first annular runner 28 are concentric, but the second annular runner 29 is eccentric in the direction away from the sprue 32 by ε.
また、第１図および第２図に示した実施例にお
いては、キヤビテイ溝２７を２組有する装置であ
り、成形材料の導入口であるスプルー３２も２箇
所に設けられて、その２箇所のスプルー３２の位
置は、第２の型である固定側型板２４に対象位置
に設けられている。 Furthermore, in the embodiment shown in FIGS. 1 and 2, the device has two sets of cavity grooves 27, and sprues 32, which are molding material introduction ports, are also provided at two locations. The position 32 is provided at a target position on the fixed side mold plate 24, which is the second mold.
第３図および第４図は、本考案の他の実施例の
射出成形装置を示すもので、第３図は平面説明
図、第４図は第３図のＡ−Ａ線矢視断面説明図で
あり、同図においては、キヤビテイ溝２７の外周
に沿つて第１の円環状ランナー２８が、さらに第
１の円環状ランナー２８の外周に沿つて第２の円
環状ランナー２９が配設され、前記キヤビテイ溝
２７と第１の円環状ランナー２８との間は、前記
実施例のものと同様に全周にわたつて微小間隙か
つ微小幅の第１のフイルムゲート３０にて連通連
結され、前記第１の円環状ランナー２８と第２の
円環状ランナー２９との間は、前記実施例のもの
と同様に全周にわたつて、前記第１のフイルムゲ
ート３０以上の大きさの間隙かつ幅の第２のフイ
ルムゲート３１にて連通連結されている。 3 and 4 show an injection molding apparatus according to another embodiment of the present invention, in which FIG. 3 is an explanatory plan view, and FIG. 4 is an explanatory cross-sectional view taken along the line A-A in FIG. 3. In the figure, a first annular runner 28 is disposed along the outer periphery of the cavity groove 27, and a second annular runner 29 is further disposed along the outer periphery of the first annular runner 28. The cavity groove 27 and the first annular runner 28 are connected to each other by a first film gate 30 having a minute gap and a minute width over the entire circumference, as in the embodiment described above. Between the first annular runner 28 and the second annular runner 29, there is a gap larger than the first film gate 30 and a width of the second annular runner 29 over the entire circumference, as in the previous embodiment. They are connected to each other by two film gates 31.
また、前記第２の円環状ランナー２９には、前
記実施例のものと同様にスプルー３２が配設され
るとともに第２のフイルムゲート３１の幅を変化
させている。 Furthermore, the second annular runner 29 is provided with a sprue 32, similar to that of the embodiment described above, and the width of the second film gate 31 is varied.
ここで、前記スプルー３２は、前記実施例のも
のと異なり、２組のキヤビテイ溝２７に対し１箇
設けるのみでよく、上記以外は前記実施例のもの
と同様の構成である。 Here, unlike the previous embodiment, only one sprue 32 needs to be provided for each of the two sets of cavity grooves 27, and the structure other than the above is the same as that of the previous embodiment.
上記の如く構成される本考案の各実施例による
射出成形装置は、図示しない駆動装置により、第
２図の如く、前記可動側型板２３と固定側型板２
４が当接して型締めがなされた後、図示しない射
出装置によりゴム等の成形材料を図示しないノズ
ルをノズル間挿穴２６に進入させてノズルタツチ
させ、スプルー３２を経由して、第２の円環状ラ
ンナー２９、第２のフイルムゲート３１、第１の
円環状ランナー２８、第１のフイルムゲート３０
の順で充填し、最後にキヤビテイ溝２７に充填す
る。 In the injection molding apparatus according to each embodiment of the present invention constructed as described above, the movable mold plate 23 and the fixed mold plate 2 are connected to each other by a driving device (not shown) as shown in FIG.
4 are brought into contact and the mold is clamped, a nozzle (not shown) of molding material such as rubber is inserted into the nozzle insertion hole 26 using an injection device (not shown), and the nozzle touches the nozzle, and the molding material is injected into the second circle via the sprue 32. Annular runner 29, second film gate 31, first annular runner 28, first film gate 30
Fill in the following order, and finally fill the cavity groove 27.
キヤビテイ溝２７に成形材料が充填された後、
所定時間保持し、前記駆動装置により可動側を移
動させ型開きし、円環状の成形品を取り出す。以
後、この操作をくり返す。 After the cavity groove 27 is filled with the molding material,
After holding the mold for a predetermined time, the movable side is moved by the driving device to open the mold, and the annular molded product is taken out. From now on, repeat this operation.
以上の工程で得られた成形品においては、ウエ
ルドが発生しないことは勿論、円環状成形品の内
周または外周のどちらか一方にできるバリの厚み
が一定で、バリの引きちぎりが容易であり、後処
理が簡単なものであり、商品価値の高い高品質の
ものが得られる。 In the molded product obtained by the above process, not only no weld occurs, but also the thickness of the burr formed on either the inner or outer circumference of the annular molded product is constant, and the burr can be easily torn off. , post-processing is easy, and high-quality products with high commercial value can be obtained.
また、従来技術の第７図〜第９図ではスプルー
の位置が装置全体に対して偏心しているのに対
し、各実施例の装置はスプルーを装置全体の対象
位置、または中心の１箇所に設けることができる
ため、型締め、型開き工程における射出成形装置
への局部的負荷を防止することができ、安全作
動、耐久性を確実に向上させることができる。 In addition, in the prior art shown in FIGS. 7 to 9, the sprue is located eccentrically with respect to the entire device, whereas in the devices of each embodiment, the sprue is provided at a target position or at one location in the center of the entire device. Therefore, local loads on the injection molding apparatus during the mold clamping and mold opening processes can be prevented, and safe operation and durability can be reliably improved.
なお、前記実施例においては、第２の円環状ラ
ンナーの流入圧力調整を該ランナーの幅をもつて
調整したが、幅を一定として、ランナーの間隙を
調整してもよいし、両者の併用で調整してもよ
い。 In the above embodiment, the inflow pressure of the second annular runner was adjusted by adjusting the width of the runner, but it is also possible to keep the width constant and adjust the gap between the runners, or by using both in combination. May be adjusted.
また、従来の装置と同様に、真空排気もしくは
スプルー口の直下にポペツト式の真空排気装置を
設けてもよいし、さらに、エジエクト機構を設け
てもよく、さらにまた、型板の中央部にぬすみを
設けてバリの発生を防止するようにしてもよい。 In addition, like the conventional device, a poppet-type vacuum evacuation device may be provided directly under the vacuum evacuation or sprue opening, and an eject mechanism may also be provided. may be provided to prevent the occurrence of burrs.
本考案は前記のように構成したことにより、以
下のような効果を奏する。
By configuring the present invention as described above, the following effects are achieved.
イ 本考案は射出成形装置には、たとえ成形材料
の物性、注入圧力および成形温度が変更されて
も、注入材料が第１のフイルムゲートにより絞
られており、成形用キヤビテイより小形の第１
のランナーをすぐに充満し、この状態で成形用
キヤビテイ内に流入するから、第２のランナー
から第２のフイルムゲートを通つて、直接成形
用キヤビテイに注入される場合に比較して、成
形用キヤビテイ内により均一に注入材料を供給
でき、フローマーク（ウエルドマーク）を効果
的に防止することが期待できる。B. The present invention has an injection molding device in which the injection material is squeezed by the first film gate, even if the physical properties of the molding material, injection pressure, and molding temperature are changed, and the injection molding device has a first film gate that is smaller than the molding cavity.
Since the runner immediately fills up and flows into the molding cavity in this state, compared to the case where the injection is directly into the molding cavity from the second runner through the second film gate, the molding It is expected that the injection material can be more uniformly supplied into the cavity and that flow marks (weld marks) can be effectively prevented.
ロ しかも、第２のランナーと第２のフイルムゲ
ートのみが成形用キヤビテイに連通されたもの
の場合には、第２のフイルムゲートの形状にお
いて、最大幅又は最小間隙は対象の最小幅又は
最大間隙に対し、比が大きくなる。その結果、
この最大幅又は最小間隙を成形材料が通過する
とき、型からの加熱温度の影響を大きく受けて
加硫が促進し過ぎて、不良の原因となるが、本
考案には第１のランナーが設けられているの
で、前述の比を小さくできると共に、第２のラ
ンナーと成形用キヤビテイとの間にフイルムゲ
ートより大きな間隙部に相当する通路を形成す
ることになるから、第２のランナーから成形用
キヤビテイに至る注入過程で成形材料が加硫し
過ぎることがなく、不良の発生を効果的に防止
することが期待できる。(b) In addition, in the case where only the second runner and the second film gate are communicated with the molding cavity, the maximum width or minimum gap in the shape of the second film gate is the same as the minimum width or maximum gap of the object. On the other hand, the ratio becomes larger. the result,
When the molding material passes through this maximum width or minimum gap, it is greatly affected by the heating temperature from the mold and vulcanization is accelerated too much, causing defects, but in this invention, a first runner is provided. Since the above-mentioned ratio can be made small, and a passage corresponding to a gap larger than the film gate is formed between the second runner and the molding cavity, the molding cavity can be removed from the second runner. The molding material will not be over-vulcanized during the injection process leading to the cavity, and it can be expected to effectively prevent the occurrence of defects.
ハ 更に、第２のフイルムゲートの複雑な形状に
より、この部分から成形品とバリとを分離する
ことは困難であるが、本考案にはバリの厚さを
一定にする第１のフイルムゲートを有するか
ら、この部分から成形品とバリとを極めて容易
に分離することが可能となる。従つて、成形品
のバリ仕上加工を省略することができる。Furthermore, due to the complicated shape of the second film gate, it is difficult to separate the molded product and the burr from this part, but the present invention includes a first film gate that keeps the burr thickness constant. This makes it possible to separate the molded product and the burr from this part very easily. Therefore, burr finishing of the molded product can be omitted.
第１図は本考案の一実施例による射出成形装置
の平面説明図、第２図は第１図のＡ−Ａ線矢視断
面説明図、第３図は本考案の他の実施例による射
出成形装置の平面説明図、第４図は第３図のＡ−
Ａ線矢視断面説明図、第５図は従来の射出成形装
置を示し、第５図ａは平面説明図、第５図ｂは断
面説明図、第６図はキヤビテイへの充填状態説明
図、第７図〜第９図は他の従来例を示し、第７図
は断面説明図、第８図は第７図の−線矢視断
面図、第９図は第７図の要部拡大断面図である。
１，２，１０，１１……金型、３，１２，２７
……キヤビテイ溝、４……棒状ランナー、５……
ゲート、６……ノズル間挿穴、１５……ノズル、
７，１６，３２……スプルー、１３……リング状
ランナー、１４……フイルムゲート、２１……可
動側取付け板、２２……固定側取付け板、２３…
…可動側型板、２４……固定側型板、２５……タ
イバー、２６……ノズル間挿穴、２８……第１の
円環状ランナー、２９……第２の円環状ランナ
ー、３０……第１のフイルムゲート、３１……第
２のフイルムゲート。
Fig. 1 is an explanatory plan view of an injection molding apparatus according to an embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is an explanatory plan view of an injection molding apparatus according to another embodiment of the invention An explanatory plan view of the molding device, Fig. 4 is A- in Fig. 3.
5 shows a conventional injection molding apparatus, FIG. 5a is a plan view, FIG. 5b is a cross-sectional view, and FIG. 6 is an explanatory view of the state of filling the cavity. 7 to 9 show other conventional examples, FIG. 7 is an explanatory cross-sectional view, FIG. 8 is a cross-sectional view taken along the - line in FIG. 7, and FIG. 9 is an enlarged cross-section of the main part of FIG. 7. It is a diagram. 1, 2, 10, 11...Mold, 3, 12, 27
...Cavity groove, 4...Bar-shaped runner, 5...
Gate, 6...Nozzle insertion hole, 15...Nozzle,
7, 16, 32... Sprue, 13... Ring-shaped runner, 14... Film gate, 21... Movable side mounting plate, 22... Fixed side mounting plate, 23...
...Movable side template, 24... Fixed side template, 25... Tie bar, 26... Nozzle insertion hole, 28... First annular runner, 29... Second annular runner, 30... First film gate, 31... second film gate.
Claims (1)
２７を有し、前記キヤビテイ２７の周面に環状の
第２のランナー２９を有すると共に、前記第２の
ランナー２９には成形材料を注入するスプルー３
２を備え、前記キヤビテイ２７と前記第２のラン
ナー２９との間に環状の前記キヤビテイ２７より
小形の第１のランナー２８を有すると共に前記第
１のランナー２８と前記第２のランナー２９との
間に前記スプルー３２から遠ざかるほど前記第２
のランナー２９からの成形材料の流入抵抗が小さ
くなる幅または間隙に形成された第２のフイルゲ
ート３１を有し、且つ前記第１のランナー２８と
前記キヤビテイ２７との間にほぼ同一間隔の第１
のフイルゲート３０を有する射出成形装置。 It has an annular molding cavity 27 between the dividing surfaces of the pair of molds, and has an annular second runner 29 on the circumferential surface of the cavity 27, and the second runner 29 has a sprue for injecting the molding material. 3
2, having a first runner 28 smaller than the annular cavity 27 between the cavity 27 and the second runner 29, and between the first runner 28 and the second runner 29. The further away from the sprue 32 the second
a second fill gate 31 formed in a width or a gap that reduces the inflow resistance of the molding material from the runner 29;
An injection molding apparatus having a fill gate 30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987099937U JPH0525862Y2 (en) | 1987-06-29 | 1987-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987099937U JPH0525862Y2 (en) | 1987-06-29 | 1987-06-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS644617U JPS644617U (en) | 1989-01-12 |
| JPH0525862Y2 true JPH0525862Y2 (en) | 1993-06-30 |
Family
ID=31327555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987099937U Expired - Lifetime JPH0525862Y2 (en) | 1987-06-29 | 1987-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0525862Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2206594B1 (en) * | 2007-10-05 | 2017-01-11 | NGK Insulators, Ltd. | Shaping mold and method of shaping |
| JP5292168B2 (en) * | 2009-04-27 | 2013-09-18 | Ｃｋｄ株式会社 | Cylindrical part manufacturing method and cylindrical part manufacturing mold |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539859B2 (en) * | 1974-01-31 | 1980-10-14 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539859U (en) * | 1978-09-08 | 1980-03-14 |
-
1987
- 1987-06-29 JP JP1987099937U patent/JPH0525862Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539859B2 (en) * | 1974-01-31 | 1980-10-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS644617U (en) | 1989-01-12 |
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